STL/stl/inc/memory

4147 строки
152 KiB
C++

// memory standard header
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#pragma once
#ifndef _MEMORY_
#define _MEMORY_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#include <exception>
#include <iosfwd>
#include <type_traits>
#include <typeinfo>
#include <xmemory>
#if _HAS_CXX20
#include <atomic>
#endif
#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new
_STD_BEGIN
#ifdef __cpp_lib_concepts
namespace ranges {
// ALIAS TEMPLATE uninitialized_copy_result
template <class _In, class _Out>
using uninitialized_copy_result = in_out_result<_In, _Out>;
// VARIABLE ranges::uninitialized_copy
class _Uninitialized_copy_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <input_iterator _It, sentinel_for<_It> _Se, _No_throw_forward_iterator _Out,
_No_throw_sentinel_for<_Out> _OSe>
requires constructible_from<iter_value_t<_Out>, iter_reference_t<_It>>
uninitialized_copy_result<_It, _Out> operator()(_It _First1, _Se _Last1, _Out _First2, _OSe _Last2) const {
// clang-format on
_Adl_verify_range(_First1, _Last1);
_Adl_verify_range(_First2, _Last2);
auto _UResult =
_Uninitialized_copy_unchecked(_Get_unwrapped(_STD move(_First1)), _Get_unwrapped(_STD move(_Last1)),
_Get_unwrapped(_STD move(_First2)), _Get_unwrapped(_STD move(_Last2)));
_Seek_wrapped(_First1, _STD move(_UResult.in));
_Seek_wrapped(_First2, _STD move(_UResult.out));
return {_STD move(_First1), _STD move(_First2)};
}
// clang-format off
template <input_range _Rng1, _No_throw_forward_range _Rng2>
requires constructible_from<range_value_t<_Rng2>, range_reference_t<_Rng1>>
uninitialized_copy_result<borrowed_iterator_t<_Rng1>, borrowed_iterator_t<_Rng2>> operator()(
_Rng1&& _Range1, _Rng2&& _Range2) const {
// clang-format on
auto _First1 = _RANGES begin(_Range1);
auto _UResult = _Uninitialized_copy_unchecked(
_Get_unwrapped(_STD move(_First1)), _Uend(_Range1), _Ubegin(_Range2), _Uend(_Range2));
_Seek_wrapped(_First1, _STD move(_UResult.in));
return {_STD move(_First1), _Rewrap_iterator(_Range2, _STD move(_UResult.out))};
}
private:
template <class _It, class _Se, class _Out, class _OSe>
_NODISCARD static uninitialized_copy_result<_It, _Out> _Uninitialized_copy_unchecked(
_It _IFirst, _Se _ILast, _Out _OFirst, _OSe _OLast) {
_STL_INTERNAL_STATIC_ASSERT(input_iterator<_It>);
_STL_INTERNAL_STATIC_ASSERT(sentinel_for<_Se, _It>);
_STL_INTERNAL_STATIC_ASSERT(_No_throw_forward_iterator<_Out>);
_STL_INTERNAL_STATIC_ASSERT(_No_throw_sentinel_for<_OSe, _Out>);
_STL_INTERNAL_STATIC_ASSERT(constructible_from<iter_value_t<_Out>, iter_reference_t<_It>>);
constexpr bool _Is_sized1 = sized_sentinel_for<_Se, _It>;
constexpr bool _Is_sized2 = sized_sentinel_for<_OSe, _Out>;
if constexpr (_Ptr_copy_cat<_It, _Out>::_Really_trivial && _Sized_or_unreachable_sentinel_for<_Se, _It> //
&& _Sized_or_unreachable_sentinel_for<_OSe, _Out>) {
if constexpr (_Is_sized1 && _Is_sized2) {
return _Copy_memcpy_common(_IFirst, _RANGES next(_IFirst, _STD move(_ILast)), _OFirst,
_RANGES next(_OFirst, _STD move(_OLast)));
} else if constexpr (_Is_sized1) {
return _Copy_memcpy_distance(_IFirst, _OFirst, _IFirst, _RANGES next(_IFirst, _STD move(_ILast)));
} else if constexpr (_Is_sized2) {
return _Copy_memcpy_distance(_IFirst, _OFirst, _OFirst, _RANGES next(_OFirst, _STD move(_OLast)));
} else {
_STL_ASSERT(false, "Tried to uninitialized_copy two ranges with unreachable sentinels");
}
} else {
_Uninitialized_backout _Backout{_STD move(_OFirst)};
for (; _IFirst != _ILast && _Backout._Last != _OLast; ++_IFirst) {
_Backout._Emplace_back(*_IFirst);
}
return {_STD move(_IFirst), _Backout._Release()};
}
}
};
inline constexpr _Uninitialized_copy_fn uninitialized_copy{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_copy_n
template <class _InIt, class _Diff, class _NoThrowFwdIt>
_NoThrowFwdIt uninitialized_copy_n(const _InIt _First, const _Diff _Count_raw, _NoThrowFwdIt _Dest) {
// copy [_First, _First + _Count) to [_Dest, ...)
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return _Dest;
}
auto _UFirst = _Get_unwrapped_n(_First, _Count);
auto _UDest = _Get_unwrapped_n(_Dest, _Count);
if constexpr (_Ptr_copy_cat<decltype(_UFirst), decltype(_UDest)>::_Really_trivial) {
_UDest = _Copy_memmove(_UFirst, _UFirst + _Count, _UDest);
} else {
_Uninitialized_backout<decltype(_UDest)> _Backout{_UDest};
for (; _Count > 0; --_Count, (void) ++_UFirst) {
_Backout._Emplace_back(*_UFirst);
}
_UDest = _Backout._Release();
}
_Seek_wrapped(_Dest, _UDest);
return _Dest;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// ALIAS TEMPLATE uninitialized_copy_n_result
template <class _In, class _Out>
using uninitialized_copy_n_result = in_out_result<_In, _Out>;
// VARIABLE ranges::uninitialized_copy_n
class _Uninitialized_copy_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <input_iterator _It, _No_throw_forward_iterator _Out, _No_throw_sentinel_for<_Out> _OSe>
requires constructible_from<iter_value_t<_Out>, iter_reference_t<_It>>
uninitialized_copy_n_result<_It, _Out> operator()(
_It _First1, iter_difference_t<_It> _Count, _Out _First2, _OSe _Last2) const {
// clang-format on
if (_Count <= 0) {
return {_STD move(_First1), _STD move(_First2)};
}
_Adl_verify_range(_First2, _Last2);
auto _IFirst = _Get_unwrapped_n(_STD move(_First1), _Count);
auto _OFirst = _Get_unwrapped(_STD move(_First2));
auto _OLast = _Get_unwrapped(_STD move(_Last2));
if constexpr (_Ptr_copy_cat<_It, _Out>::_Really_trivial && _Sized_or_unreachable_sentinel_for<_OSe, _Out>) {
if constexpr (sized_sentinel_for<_OSe, _Out>) {
auto _UResult = _Copy_memcpy_common(
_IFirst, _IFirst + _Count, _OFirst, _RANGES next(_OFirst, _STD move(_OLast)));
_IFirst = _STD move(_UResult.in);
_OFirst = _STD move(_UResult.out);
} else {
auto _UResult = _Copy_memcpy_count(_IFirst, _OFirst, static_cast<size_t>(_Count));
_IFirst = _STD move(_UResult.in);
_OFirst = _STD move(_UResult.out);
}
} else {
_Uninitialized_backout _Backout{_STD move(_OFirst)};
for (; _Count > 0 && _OFirst != _OLast; --_Count, (void) ++_IFirst) {
_Backout._Emplace_back(*_IFirst);
}
_OFirst = _Backout._Release();
}
_Seek_wrapped(_First1, _IFirst);
_Seek_wrapped(_First2, _OFirst);
return {_STD move(_First1), _STD move(_First2)};
}
};
inline constexpr _Uninitialized_copy_n_fn uninitialized_copy_n{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
#if _HAS_CXX17
// FUNCTION TEMPLATE uninitialized_move
template <class _InIt, class _NoThrowFwdIt>
_NoThrowFwdIt uninitialized_move(const _InIt _First, const _InIt _Last, _NoThrowFwdIt _Dest) {
// move [_First, _Last) to raw [_Dest, ...)
_Adl_verify_range(_First, _Last);
const auto _UFirst = _Get_unwrapped(_First);
const auto _ULast = _Get_unwrapped(_Last);
const auto _UDest = _Get_unwrapped_n(_Dest, _Idl_distance<_InIt>(_UFirst, _ULast));
_Seek_wrapped(_Dest, _Uninitialized_move_unchecked(_UFirst, _ULast, _UDest));
return _Dest;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_move
class _Uninitialized_move_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <input_iterator _It, sentinel_for<_It> _Se, _No_throw_forward_iterator _Out,
_No_throw_sentinel_for<_Out> _OSe>
requires constructible_from<iter_value_t<_Out>, iter_rvalue_reference_t<_It>>
uninitialized_move_result<_It, _Out> operator()(_It _First1, _Se _Last1, _Out _First2, _OSe _Last2) const {
// clang-format on
_Adl_verify_range(_First1, _Last1);
_Adl_verify_range(_First2, _Last2);
auto _UResult = _RANGES _Uninitialized_move_unchecked(_Get_unwrapped(_STD move(_First1)),
_Get_unwrapped(_STD move(_Last1)), _Get_unwrapped(_STD move(_First2)),
_Get_unwrapped(_STD move(_Last2)));
_Seek_wrapped(_First1, _STD move(_UResult.in));
_Seek_wrapped(_First2, _STD move(_UResult.out));
return {_STD move(_First1), _STD move(_First2)};
}
// clang-format off
template <input_range _Rng1, _No_throw_forward_range _Rng2>
requires constructible_from<range_value_t<_Rng2>, range_rvalue_reference_t<_Rng1>>
uninitialized_move_result<borrowed_iterator_t<_Rng1>, borrowed_iterator_t<_Rng2>> operator()(
_Rng1&& _Range1, _Rng2&& _Range2) const {
// clang-format on
auto _First1 = _RANGES begin(_Range1);
auto _UResult = _RANGES _Uninitialized_move_unchecked(
_Get_unwrapped(_STD move(_First1)), _Uend(_Range1), _Ubegin(_Range2), _Uend(_Range2));
_Seek_wrapped(_First1, _STD move(_UResult.in));
return {_STD move(_First1), _Rewrap_iterator(_Range2, _STD move(_UResult.out))};
}
};
inline constexpr _Uninitialized_move_fn uninitialized_move{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_move_n
template <class _InIt, class _Diff, class _NoThrowFwdIt>
pair<_InIt, _NoThrowFwdIt> uninitialized_move_n(_InIt _First, const _Diff _Count_raw, _NoThrowFwdIt _Dest) {
// move [_First, _First + _Count) to [_Dest, ...)
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return {_First, _Dest};
}
auto _UFirst = _Get_unwrapped_n(_First, _Count);
auto _UDest = _Get_unwrapped_n(_Dest, _Count);
if constexpr (_Ptr_move_cat<decltype(_UFirst), decltype(_UDest)>::_Really_trivial) {
_UDest = _Copy_memmove(_UFirst, _UFirst + _Count, _UDest);
_UFirst += _Count;
} else {
_Uninitialized_backout<decltype(_UDest)> _Backout{_UDest};
for (; _Count > 0; --_Count, (void) ++_UFirst) {
_Backout._Emplace_back(_STD move(*_UFirst));
}
_UDest = _Backout._Release();
}
_Seek_wrapped(_Dest, _UDest);
_Seek_wrapped(_First, _UFirst);
return {_First, _Dest};
}
#endif // _HAS_CXX17
#ifdef __cpp_lib_concepts
namespace ranges {
// ALIAS TEMPLATE uninitialized_move_n_result
template <class _In, class _Out>
using uninitialized_move_n_result = in_out_result<_In, _Out>;
// VARIABLE ranges::uninitialized_move_n
class _Uninitialized_move_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <input_iterator _It, _No_throw_forward_iterator _Out, _No_throw_sentinel_for<_Out> _OSe>
requires constructible_from<iter_value_t<_Out>, iter_rvalue_reference_t<_It>>
uninitialized_move_n_result<_It, _Out> operator()(
_It _First1, iter_difference_t<_It> _Count, _Out _First2, _OSe _Last2) const {
// clang-format on
if (_Count <= 0) {
return {_STD move(_First1), _STD move(_First2)};
}
_Adl_verify_range(_First2, _Last2);
auto _IFirst = _Get_unwrapped_n(_STD move(_First1), _Count);
auto _OFirst = _Get_unwrapped(_STD move(_First2));
const auto _OLast = _Get_unwrapped(_STD move(_Last2));
if constexpr (_Ptr_move_cat<_It, _Out>::_Really_trivial && _Sized_or_unreachable_sentinel_for<_OSe, _Out>) {
if constexpr (sized_sentinel_for<_OSe, _Out>) {
auto _UResult = _Copy_memcpy_common(
_IFirst, _IFirst + _Count, _OFirst, _RANGES next(_OFirst, _STD move(_OLast)));
_IFirst = _STD move(_UResult.in);
_OFirst = _STD move(_UResult.out);
} else {
auto _UResult = _Copy_memcpy_count(_IFirst, _OFirst, static_cast<size_t>(_Count));
_IFirst = _STD move(_UResult.in);
_OFirst = _STD move(_UResult.out);
}
} else {
_Uninitialized_backout _Backout{_STD move(_OFirst)};
for (; _Count > 0 && _Backout._Last != _OLast; --_Count, (void) ++_IFirst) {
_Backout._Emplace_back(_RANGES iter_move(_IFirst));
}
_OFirst = _Backout._Release();
}
_Seek_wrapped(_First1, _IFirst);
_Seek_wrapped(_First2, _OFirst);
return {_STD move(_First1), _STD move(_First2)};
}
};
inline constexpr _Uninitialized_move_n_fn uninitialized_move_n{_Not_quite_object::_Construct_tag{}};
// VARIABLE ranges::uninitialized_fill
class _Uninitialized_fill_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It, _No_throw_sentinel_for<_It> _Se, class _Ty>
requires constructible_from<iter_value_t<_It>, const _Ty&>
_It operator()(_It _First, _Se _Last, const _Ty& _Val) const {
// clang-format on
_Adl_verify_range(_First, _Last);
auto _UResult = _Uninitialized_fill_unchecked(
_Get_unwrapped(_STD move(_First)), _Get_unwrapped(_STD move(_Last)), _Val);
_Seek_wrapped(_First, _STD move(_UResult));
return _First;
}
// clang-format off
template <_No_throw_forward_range _Rng, class _Ty>
requires constructible_from<range_value_t<_Rng>, const _Ty&>
borrowed_iterator_t<_Rng> operator()(_Rng&& _Range, const _Ty& _Val) const {
// clang-format on
return _Rewrap_iterator(_Range, _Uninitialized_fill_unchecked(_Ubegin(_Range), _Uend(_Range), _Val));
}
private:
template <class _It, class _Se, class _Ty>
_NODISCARD static _It _Uninitialized_fill_unchecked(_It _OFirst, _Se _OLast, const _Ty& _Val) {
_STL_INTERNAL_STATIC_ASSERT(_No_throw_forward_iterator<_It>);
_STL_INTERNAL_STATIC_ASSERT(_No_throw_sentinel_for<_Se, _It>);
_STL_INTERNAL_STATIC_ASSERT(constructible_from<iter_value_t<_It>, const _Ty&>);
if constexpr (_Fill_memset_is_safe<_It, _Ty>) {
const auto _OFinal = _RANGES next(_OFirst, _STD move(_OLast));
_Fill_memset(_OFirst, _Val, static_cast<size_t>(_OFinal - _OFirst));
return _OFinal;
} else {
if constexpr (_Fill_zero_memset_is_safe<_It, _Ty>) {
if (_Is_all_bits_zero(_Val)) {
const auto _OFinal = _RANGES next(_OFirst, _STD move(_OLast));
_Fill_zero_memset(_OFirst, static_cast<size_t>(_OFinal - _OFirst));
return _OFinal;
}
}
_Uninitialized_backout _Backout{_STD move(_OFirst)};
while (_Backout._Last != _OLast) {
_Backout._Emplace_back(_Val);
}
return _Backout._Release();
}
}
};
inline constexpr _Uninitialized_fill_fn uninitialized_fill{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_fill_n
template <class _NoThrowFwdIt, class _Diff, class _Tval>
_NoThrowFwdIt uninitialized_fill_n(_NoThrowFwdIt _First, const _Diff _Count_raw, const _Tval& _Val) {
// copy _Count copies of _Val to raw _First
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return _First;
}
auto _UFirst = _Get_unwrapped_n(_First, _Count);
if constexpr (_Fill_memset_is_safe<decltype(_UFirst), _Tval>) {
_Fill_memset(_UFirst, _Val, static_cast<size_t>(_Count));
_UFirst += _Count;
} else {
if constexpr (_Fill_zero_memset_is_safe<decltype(_UFirst), _Tval>) {
if (_Is_all_bits_zero(_Val)) {
_Fill_zero_memset(_UFirst, static_cast<size_t>(_Count));
_Seek_wrapped(_First, _UFirst + _Count);
return _First;
}
}
_Uninitialized_backout<decltype(_UFirst)> _Backout{_UFirst};
for (; _Count > 0; --_Count) {
_Backout._Emplace_back(_Val);
}
_UFirst = _Backout._Release();
}
_Seek_wrapped(_First, _UFirst);
return _First;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_fill_n
class _Uninitialized_fill_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It, class _Ty>
requires constructible_from<iter_value_t<_It>, const _Ty&>
_It operator()(_It _First, iter_difference_t<_It> _Count, const _Ty& _Val) const {
// clang-format on
if (_Count <= 0) {
return _First;
}
auto _UFirst = _Get_unwrapped_n(_STD move(_First), _Count);
if constexpr (_Fill_memset_is_safe<decltype(_UFirst), _Ty>) {
_Fill_memset(_UFirst, _Val, static_cast<size_t>(_Count));
_Seek_wrapped(_First, _UFirst + _Count);
} else {
if constexpr (_Fill_zero_memset_is_safe<decltype(_UFirst), _Ty>) {
if (_Is_all_bits_zero(_Val)) {
_Fill_zero_memset(_UFirst, static_cast<size_t>(_Count));
_Seek_wrapped(_First, _UFirst + _Count);
return _First;
}
}
_Uninitialized_backout _Backout{_STD move(_UFirst)};
for (; _Count > 0; --_Count) {
_Backout._Emplace_back(_Val);
}
_Seek_wrapped(_First, _Backout._Release());
}
return _First;
}
};
inline constexpr _Uninitialized_fill_n_fn uninitialized_fill_n{_Not_quite_object::_Construct_tag{}};
// VARIABLE ranges::construct_at
class _Construct_at_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <class _Ty, class... _Types>
requires requires(void* _Void_ptr, _Types&&... _Args) {
::new (_Void_ptr) _Ty(static_cast<_Types&&>(_Args)...);
}
constexpr _Ty* operator()(_Ty* _Location, _Types&&... _Args) const
noexcept(noexcept(::new (const_cast<void*>(static_cast<const volatile void*>(_Location)))
_Ty(_STD forward<_Types>(_Args)...))) /* strengthened */ {
// clang-format on
return ::new (const_cast<void*>(static_cast<const volatile void*>(_Location)))
_Ty(_STD forward<_Types>(_Args)...);
}
};
inline constexpr _Construct_at_fn construct_at{_Not_quite_object::_Construct_tag{}};
// VARIABLE ranges::destroy_at
// clang-format off
template <_No_throw_input_iterator _It, _No_throw_sentinel_for<_It> _Se>
requires destructible<iter_value_t<_It>>
_NODISCARD constexpr _It _Destroy_unchecked(_It _First, _Se _Last) noexcept;
// clang-format on
class _Destroy_at_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
template <destructible _Ty>
constexpr void operator()(_Ty* const _Location) const noexcept {
if constexpr (is_array_v<_Ty>) {
(void) _RANGES _Destroy_unchecked(_RANGES begin(*_Location), _RANGES end(*_Location));
} else {
_Location->~_Ty();
}
}
};
inline constexpr _Destroy_at_fn destroy_at{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
#if _HAS_CXX17
// FUNCTION TEMPLATE destroy
template <class _NoThrowFwdIt>
_CONSTEXPR20 void destroy(const _NoThrowFwdIt _First, const _NoThrowFwdIt _Last) {
// destroy all elements in [_First, _Last)
_Adl_verify_range(_First, _Last);
_Destroy_range(_Get_unwrapped(_First), _Get_unwrapped(_Last));
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::destroy
// clang-format off
template <_No_throw_input_iterator _It, _No_throw_sentinel_for<_It> _Se>
requires destructible<iter_value_t<_It>>
_NODISCARD constexpr _It _Destroy_unchecked(_It _First, _Se _Last) noexcept {
// clang-format on
if constexpr (is_trivially_destructible_v<iter_value_t<_It>>) {
_RANGES advance(_First, _STD move(_Last));
} else {
for (; _First != _Last; ++_First) {
_RANGES destroy_at(_STD addressof(*_First));
}
}
return _First;
}
class _Destroy_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_input_iterator _It, _No_throw_sentinel_for<_It> _Se>
requires destructible<iter_value_t<_It>>
constexpr _It operator()(_It _First, _Se _Last) const noexcept {
// clang-format on
_Adl_verify_range(_First, _Last);
_Seek_wrapped(_First,
_RANGES _Destroy_unchecked(_Get_unwrapped(_STD move(_First)), _Get_unwrapped(_STD move(_Last))));
return _First;
}
// clang-format off
template <_No_throw_input_range _Rng>
requires destructible<range_value_t<_Rng>>
constexpr borrowed_iterator_t<_Rng> operator()(_Rng&& _Range) const noexcept {
// clang-format on
auto _First = _RANGES begin(_Range);
_Seek_wrapped(_First, _RANGES _Destroy_unchecked(_Get_unwrapped(_STD move(_First)), _Uend(_Range)));
return _First;
}
};
inline constexpr _Destroy_fn destroy{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE destroy_n
template <class _NoThrowFwdIt, class _Diff>
_CONSTEXPR20 _NoThrowFwdIt destroy_n(_NoThrowFwdIt _First, const _Diff _Count_raw) {
// destroy all elements in [_First, _First + _Count)
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return _First;
}
auto _UFirst = _Get_unwrapped_n(_First, _Count);
if constexpr (is_trivially_destructible_v<_Iter_value_t<_NoThrowFwdIt>>) {
_STD advance(_UFirst, _Count);
} else {
for (; _Count > 0; --_Count, (void) ++_UFirst) {
_Destroy_in_place(*_UFirst);
}
}
_Seek_wrapped(_First, _UFirst);
return _First;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::destroy_n
class _Destroy_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_input_iterator _It>
requires destructible<iter_value_t<_It>>
constexpr _It operator()(_It _First, const iter_difference_t<_It> _Count_raw) const noexcept {
// clang-format on
_Algorithm_int_t<iter_difference_t<_It>> _Count = _Count_raw;
if (_Count <= 0) {
return _First;
}
auto _UFirst = _Get_unwrapped_n(_STD move(_First), _Count);
if constexpr (is_trivially_destructible_v<iter_value_t<_It>>) {
_RANGES advance(_UFirst, _Count);
} else {
do {
_RANGES destroy_at(_STD addressof(*_UFirst));
++_UFirst;
--_Count;
} while (_Count > 0);
}
_Seek_wrapped(_First, _STD move(_UFirst));
return _First;
}
};
inline constexpr _Destroy_n_fn destroy_n{_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_default_construct
template <class _NoThrowFwdIt>
void uninitialized_default_construct(const _NoThrowFwdIt _First, const _NoThrowFwdIt _Last) {
// default-initialize all elements in [_First, _Last)
using _Ty = remove_reference_t<_Iter_ref_t<_NoThrowFwdIt>>;
_Adl_verify_range(_First, _Last);
if constexpr (!is_trivially_default_constructible_v<_Ty>) {
_Uninitialized_backout _Backout{_Get_unwrapped(_First)};
for (const auto _ULast = _Get_unwrapped(_Last); _Backout._Last != _ULast; ++_Backout._Last) {
_Default_construct_in_place(*_Backout._Last);
}
_Backout._Release();
}
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_default_construct
class _Uninitialized_default_construct_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It, _No_throw_sentinel_for<_It> _Se>
requires default_initializable<iter_value_t<_It>>
_It operator()(_It _First, _Se _Last) const {
// clang-format on
_Adl_verify_range(_First, _Last);
auto _UResult = _Uninitialized_default_construct_unchecked(
_Get_unwrapped(_STD move(_First)), _Get_unwrapped(_STD move(_Last)));
_Seek_wrapped(_First, _STD move(_UResult));
return _First;
}
// clang-format off
template <_No_throw_forward_range _Rng>
requires default_initializable<range_value_t<_Rng>>
borrowed_iterator_t<_Rng> operator()(_Rng&& _Range) const {
// clang-format on
auto _UResult = _Uninitialized_default_construct_unchecked(_Ubegin(_Range), _Uend(_Range));
return _Rewrap_iterator(_Range, _STD move(_UResult));
}
private:
template <class _It, class _Se>
_NODISCARD static _It _Uninitialized_default_construct_unchecked(_It _OFirst, const _Se _OLast) {
_STL_INTERNAL_STATIC_ASSERT(_No_throw_forward_iterator<_It>);
_STL_INTERNAL_STATIC_ASSERT(_No_throw_sentinel_for<_Se, _It>);
_STL_INTERNAL_STATIC_ASSERT(default_initializable<iter_value_t<_It>>);
using _Ty = remove_reference_t<iter_reference_t<_It>>;
if constexpr (is_trivially_default_constructible_v<_Ty>) {
_RANGES advance(_OFirst, _OLast);
return _OFirst;
} else {
_Uninitialized_backout _Backout{_STD move(_OFirst)};
for (; _Backout._Last != _OLast; ++_Backout._Last) {
_Default_construct_in_place(*_Backout._Last);
}
return _Backout._Release();
}
}
};
inline constexpr _Uninitialized_default_construct_fn uninitialized_default_construct{
_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_default_construct_n
template <class _NoThrowFwdIt, class _Diff>
_NoThrowFwdIt uninitialized_default_construct_n(_NoThrowFwdIt _First, const _Diff _Count_raw) {
// default-initialize all elements in [_First, _First + _Count_raw)
using _Ty = _Iter_value_t<_NoThrowFwdIt>;
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return _First;
}
if constexpr (is_trivially_default_constructible_v<_Ty>) {
_STD advance(_First, _Count);
} else {
_Uninitialized_backout _Backout{_Get_unwrapped_n(_First, _Count)};
for (; _Count > 0; ++_Backout._Last, (void) --_Count) {
_Default_construct_in_place(*_Backout._Last);
}
_Seek_wrapped(_First, _Backout._Release());
}
return _First;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_default_construct_n
class _Uninitialized_default_construct_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It>
requires default_initializable<iter_value_t<_It>>
_It operator()(_It _First, iter_difference_t<_It> _Count) const {
// clang-format on
if (_Count <= 0) {
return _First;
}
using _Ty = remove_reference_t<iter_reference_t<_It>>;
if constexpr (is_trivially_default_constructible_v<_Ty>) {
_RANGES advance(_First, _Count);
} else {
_Uninitialized_backout _Backout{_Get_unwrapped_n(_STD move(_First), _Count)};
for (; _Count > 0; --_Count, (void) ++_Backout._Last) {
_Default_construct_in_place(*_Backout._Last);
}
_Seek_wrapped(_First, _Backout._Release());
}
return _First;
}
};
inline constexpr _Uninitialized_default_construct_n_fn uninitialized_default_construct_n{
_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_value_construct
template <class _NoThrowFwdIt>
void uninitialized_value_construct(const _NoThrowFwdIt _First, const _NoThrowFwdIt _Last) {
// value-initialize all elements in [_First, _Last)
_Adl_verify_range(_First, _Last);
const auto _UFirst = _Get_unwrapped(_First);
const auto _ULast = _Get_unwrapped(_Last);
if constexpr (_Use_memset_value_construct_v<_Unwrapped_t<const _NoThrowFwdIt&>>) {
_Zero_range(_UFirst, _ULast);
} else {
_Uninitialized_backout _Backout{_UFirst};
while (_Backout._Last != _ULast) {
_Backout._Emplace_back();
}
_Backout._Release();
}
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_value_construct
class _Uninitialized_value_construct_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It, _No_throw_sentinel_for<_It> _Se>
requires default_initializable<iter_value_t<_It>>
_It operator()(_It _First, _Se _Last) const {
// clang-format on
_Adl_verify_range(_First, _Last);
auto _UResult = _Uninitialized_value_construct_unchecked(
_Get_unwrapped(_STD move(_First)), _Get_unwrapped(_STD move(_Last)));
_Seek_wrapped(_First, _STD move(_UResult));
return _First;
}
// clang-format off
template <_No_throw_forward_range _Rng>
requires default_initializable<range_value_t<_Rng>>
borrowed_iterator_t<_Rng> operator()(_Rng&& _Range) const {
// clang-format on
auto _UResult = _Uninitialized_value_construct_unchecked(_Ubegin(_Range), _Uend(_Range));
return _Rewrap_iterator(_Range, _STD move(_UResult));
}
private:
template <class _It, class _Se>
_NODISCARD static _It _Uninitialized_value_construct_unchecked(_It _OFirst, _Se _OLast) {
_STL_INTERNAL_STATIC_ASSERT(_No_throw_forward_iterator<_It>);
_STL_INTERNAL_STATIC_ASSERT(_No_throw_sentinel_for<_Se, _It>);
_STL_INTERNAL_STATIC_ASSERT(default_initializable<iter_value_t<_It>>);
if constexpr (_Use_memset_value_construct_v<_It>) {
return _Zero_range(_OFirst, _RANGES next(_OFirst, _STD move(_OLast)));
} else {
_Uninitialized_backout _Backout{_STD move(_OFirst)};
while (_Backout._Last != _OLast) {
_Backout._Emplace_back();
}
return _Backout._Release();
}
}
};
inline constexpr _Uninitialized_value_construct_fn uninitialized_value_construct{
_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
// FUNCTION TEMPLATE uninitialized_value_construct_n
template <class _NoThrowFwdIt, class _Diff>
_NoThrowFwdIt uninitialized_value_construct_n(_NoThrowFwdIt _First, const _Diff _Count_raw) {
// value-initialize all elements in [_First, _First + _Count_raw)
_Algorithm_int_t<_Diff> _Count = _Count_raw;
if (_Count <= 0) {
return _First;
}
_Seek_wrapped(_First, _Uninitialized_value_construct_n_unchecked1(_Get_unwrapped_n(_First, _Count), _Count));
return _First;
}
#ifdef __cpp_lib_concepts
namespace ranges {
// VARIABLE ranges::uninitialized_value_construct_n
class _Uninitialized_value_construct_n_fn : private _Not_quite_object {
public:
using _Not_quite_object::_Not_quite_object;
// clang-format off
template <_No_throw_forward_iterator _It>
requires default_initializable<iter_value_t<_It>>
_It operator()(_It _First, iter_difference_t<_It> _Count) const {
// clang-format on
if (_Count <= 0) {
return _First;
}
auto _UFirst = _Get_unwrapped_n(_STD move(_First), _Count);
if constexpr (_Use_memset_value_construct_v<_It>) {
_Seek_wrapped(_First, _Zero_range(_UFirst, _UFirst + _Count));
} else {
_Uninitialized_backout _Backout{_STD move(_UFirst)};
for (; _Count > 0; --_Count) {
_Backout._Emplace_back();
}
_Seek_wrapped(_First, _Backout._Release());
}
return _First;
}
};
inline constexpr _Uninitialized_value_construct_n_fn uninitialized_value_construct_n{
_Not_quite_object::_Construct_tag{}};
} // namespace ranges
#endif // __cpp_lib_concepts
#endif // _HAS_CXX17
#if _HAS_DEPRECATED_RAW_STORAGE_ITERATOR
// CLASS TEMPLATE raw_storage_iterator
template <class _OutIt, class _Ty>
class _CXX17_DEPRECATE_RAW_STORAGE_ITERATOR raw_storage_iterator { // wrap stores to raw buffer as output iterator
public:
using iterator_category = output_iterator_tag;
using value_type = void;
using difference_type = void;
using pointer = void;
using reference = void;
explicit raw_storage_iterator(_OutIt _First) : _Next(_First) {}
_NODISCARD raw_storage_iterator& operator*() { // pretend to return designated value
return *this;
}
raw_storage_iterator& operator=(const _Ty& _Val) { // construct value designated by stored iterator
_Construct_in_place(*_Next, _Val);
return *this;
}
raw_storage_iterator& operator=(_Ty&& _Val) { // construct value designated by stored iterator
_Construct_in_place(*_Next, _STD move(_Val));
return *this;
}
raw_storage_iterator& operator++() {
++_Next;
return *this;
}
raw_storage_iterator operator++(int) {
raw_storage_iterator _Ans = *this;
++_Next;
return _Ans;
}
_NODISCARD _OutIt base() const {
return _Next;
}
private:
_OutIt _Next;
};
#endif // _HAS_DEPRECATED_RAW_STORAGE_ITERATOR
#if _HAS_AUTO_PTR_ETC
// CLASS TEMPLATE auto_ptr
template <class _Ty>
class auto_ptr;
template <class _Ty>
struct auto_ptr_ref { // proxy reference for auto_ptr copying
explicit auto_ptr_ref(_Ty* _Right) : _Ref(_Right) {}
_Ty* _Ref; // generic pointer to auto_ptr ptr
};
template <class _Ty>
class auto_ptr { // wrap an object pointer to ensure destruction
public:
using element_type = _Ty;
explicit auto_ptr(_Ty* _Ptr = nullptr) noexcept : _Myptr(_Ptr) {}
auto_ptr(auto_ptr& _Right) noexcept : _Myptr(_Right.release()) {}
auto_ptr(auto_ptr_ref<_Ty> _Right) noexcept {
_Ty* _Ptr = _Right._Ref;
_Right._Ref = nullptr; // release old
_Myptr = _Ptr; // reset this
}
template <class _Other>
operator auto_ptr<_Other>() noexcept { // convert to compatible auto_ptr
return auto_ptr<_Other>(*this);
}
template <class _Other>
operator auto_ptr_ref<_Other>() noexcept { // convert to compatible auto_ptr_ref
_Other* _Cvtptr = _Myptr; // test implicit conversion
auto_ptr_ref<_Other> _Ans(_Cvtptr);
_Myptr = nullptr; // pass ownership to auto_ptr_ref
return _Ans;
}
template <class _Other>
auto_ptr& operator=(auto_ptr<_Other>& _Right) noexcept {
reset(_Right.release());
return *this;
}
template <class _Other>
auto_ptr(auto_ptr<_Other>& _Right) noexcept : _Myptr(_Right.release()) {}
auto_ptr& operator=(auto_ptr& _Right) noexcept {
reset(_Right.release());
return *this;
}
auto_ptr& operator=(auto_ptr_ref<_Ty> _Right) noexcept {
_Ty* _Ptr = _Right._Ref;
_Right._Ref = 0; // release old
reset(_Ptr); // set new
return *this;
}
~auto_ptr() noexcept {
delete _Myptr;
}
_NODISCARD _Ty& operator*() const noexcept {
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_Myptr, "auto_ptr not dereferenceable");
#endif // _ITERATOR_DEBUG_LEVEL == 2
return *get();
}
_NODISCARD _Ty* operator->() const noexcept {
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_Myptr, "auto_ptr not dereferenceable");
#endif // _ITERATOR_DEBUG_LEVEL == 2
return get();
}
_NODISCARD _Ty* get() const noexcept {
return _Myptr;
}
_Ty* release() noexcept {
_Ty* _Tmp = _Myptr;
_Myptr = nullptr;
return _Tmp;
}
void reset(_Ty* _Ptr = nullptr) noexcept { // destroy designated object and store new pointer
if (_Ptr != _Myptr) {
delete _Myptr;
}
_Myptr = _Ptr;
}
private:
_Ty* _Myptr; // the wrapped object pointer
};
template <>
class auto_ptr<void> {
public:
using element_type = void;
};
#endif // _HAS_AUTO_PTR_ETC
// CLASS bad_weak_ptr
class bad_weak_ptr : public exception { // exception type for invalid use of expired weak_ptr object
public:
bad_weak_ptr() noexcept {}
_NODISCARD virtual const char* __CLR_OR_THIS_CALL what() const noexcept override {
// return pointer to message string
return "bad_weak_ptr";
}
};
[[noreturn]] inline void _Throw_bad_weak_ptr() {
_THROW(bad_weak_ptr{});
}
// CLASS _Ref_count_base
class __declspec(novtable) _Ref_count_base { // common code for reference counting
private:
#ifdef _M_CEE_PURE
// permanent workaround to avoid mentioning _purecall in msvcurt.lib, ptrustu.lib, or other support libs
virtual void _Destroy() noexcept {
_STD terminate();
}
virtual void _Delete_this() noexcept {
_STD terminate();
}
#else // ^^^ _M_CEE_PURE / !_M_CEE_PURE vvv
virtual void _Destroy() noexcept = 0; // destroy managed resource
virtual void _Delete_this() noexcept = 0; // destroy self
#endif // _M_CEE_PURE
_Atomic_counter_t _Uses = 1;
_Atomic_counter_t _Weaks = 1;
protected:
constexpr _Ref_count_base() noexcept = default; // non-atomic initializations
public:
_Ref_count_base(const _Ref_count_base&) = delete;
_Ref_count_base& operator=(const _Ref_count_base&) = delete;
virtual ~_Ref_count_base() noexcept {} // TRANSITION, should be non-virtual
bool _Incref_nz() noexcept { // increment use count if not zero, return true if successful
auto& _Volatile_uses = reinterpret_cast<volatile long&>(_Uses);
#ifdef _M_CEE_PURE
long _Count = *_Atomic_address_as<const long>(&_Volatile_uses);
#else
long _Count = __iso_volatile_load32(reinterpret_cast<volatile int*>(&_Volatile_uses));
#endif
while (_Count != 0) {
const long _Old_value = _INTRIN_RELAXED(_InterlockedCompareExchange)(&_Volatile_uses, _Count + 1, _Count);
if (_Old_value == _Count) {
return true;
}
_Count = _Old_value;
}
return false;
}
void _Incref() noexcept { // increment use count
_MT_INCR(_Uses);
}
void _Incwref() noexcept { // increment weak reference count
_MT_INCR(_Weaks);
}
void _Decref() noexcept { // decrement use count
if (_MT_DECR(_Uses) == 0) {
_Destroy();
_Decwref();
}
}
void _Decwref() noexcept { // decrement weak reference count
if (_MT_DECR(_Weaks) == 0) {
_Delete_this();
}
}
long _Use_count() const noexcept {
return static_cast<long>(_Uses);
}
virtual void* _Get_deleter(const type_info&) const noexcept {
return nullptr;
}
};
// CLASS TEMPLATE _Ref_count
template <class _Ty>
class _Ref_count : public _Ref_count_base { // handle reference counting for pointer without deleter
public:
explicit _Ref_count(_Ty* _Px) : _Ref_count_base(), _Ptr(_Px) {}
private:
virtual void _Destroy() noexcept override { // destroy managed resource
delete _Ptr;
}
virtual void _Delete_this() noexcept override { // destroy self
delete this;
}
_Ty* _Ptr;
};
// CLASS TEMPLATE _Ref_count_resource
template <class _Resource, class _Dx>
class _Ref_count_resource : public _Ref_count_base { // handle reference counting for object with deleter
public:
_Ref_count_resource(_Resource _Px, _Dx _Dt)
: _Ref_count_base(), _Mypair(_One_then_variadic_args_t{}, _STD move(_Dt), _Px) {}
#ifdef __EDG__ // TRANSITION, VSO-1292293
virtual ~_Ref_count_resource() noexcept override {} // TRANSITION, should be non-virtual
#else // ^^^ workaround / no workaround vvv
virtual ~_Ref_count_resource() noexcept override = default; // TRANSITION, should be non-virtual
#endif // ^^^ no workaround ^^^
virtual void* _Get_deleter(const type_info& _Typeid) const noexcept override {
#if _HAS_STATIC_RTTI
if (_Typeid == typeid(_Dx)) {
return const_cast<_Dx*>(_STD addressof(_Mypair._Get_first()));
}
#else // _HAS_STATIC_RTTI
(void) _Typeid;
#endif // _HAS_STATIC_RTTI
return nullptr;
}
private:
virtual void _Destroy() noexcept override { // destroy managed resource
_Mypair._Get_first()(_Mypair._Myval2);
}
virtual void _Delete_this() noexcept override { // destroy self
delete this;
}
_Compressed_pair<_Dx, _Resource> _Mypair;
};
// CLASS TEMPLATE _Ref_count_resource_alloc
template <class _Resource, class _Dx, class _Alloc>
class _Ref_count_resource_alloc : public _Ref_count_base {
// handle reference counting for object with deleter and allocator
public:
_Ref_count_resource_alloc(_Resource _Px, _Dx _Dt, const _Alloc& _Ax)
: _Ref_count_base(),
_Mypair(_One_then_variadic_args_t{}, _STD move(_Dt), _One_then_variadic_args_t{}, _Ax, _Px) {}
#ifdef __EDG__ // TRANSITION, VSO-1292293
virtual ~_Ref_count_resource_alloc() noexcept override {} // TRANSITION, should be non-virtual
#else // ^^^ workaround / no workaround vvv
virtual ~_Ref_count_resource_alloc() noexcept override = default; // TRANSITION, should be non-virtual
#endif // ^^^ no workaround ^^^
virtual void* _Get_deleter(const type_info& _Typeid) const noexcept override {
#if _HAS_STATIC_RTTI
if (_Typeid == typeid(_Dx)) {
return const_cast<_Dx*>(_STD addressof(_Mypair._Get_first()));
}
#else // _HAS_STATIC_RTTI
(void) _Typeid;
#endif // _HAS_STATIC_RTTI
return nullptr;
}
private:
using _Myalty = _Rebind_alloc_t<_Alloc, _Ref_count_resource_alloc>;
virtual void _Destroy() noexcept override { // destroy managed resource
_Mypair._Get_first()(_Mypair._Myval2._Myval2);
}
virtual void _Delete_this() noexcept override { // destroy self
_Myalty _Al = _Mypair._Myval2._Get_first();
this->~_Ref_count_resource_alloc();
_Deallocate_plain(_Al, this);
}
_Compressed_pair<_Dx, _Compressed_pair<_Myalty, _Resource>> _Mypair;
};
// DECLARATIONS
template <class _Ty>
struct default_delete;
template <class _Ty, class _Dx = default_delete<_Ty>>
class unique_ptr;
template <class _Ty>
class shared_ptr;
template <class _Ty>
class weak_ptr;
template <class _Yty, class = void>
struct _Can_enable_shared : false_type {}; // detect unambiguous and accessible inheritance from enable_shared_from_this
template <class _Yty>
struct _Can_enable_shared<_Yty, void_t<typename _Yty::_Esft_type>>
: is_convertible<remove_cv_t<_Yty>*, typename _Yty::_Esft_type*>::type {
// is_convertible is necessary to verify unambiguous inheritance
};
// CLASS TEMPLATE _Ptr_base
struct _Exception_ptr_access;
template <class _Ty>
class _Ptr_base { // base class for shared_ptr and weak_ptr
public:
using element_type = remove_extent_t<_Ty>;
_NODISCARD long use_count() const noexcept {
return _Rep ? _Rep->_Use_count() : 0;
}
template <class _Ty2>
_NODISCARD bool owner_before(const _Ptr_base<_Ty2>& _Right) const noexcept { // compare addresses of manager objects
return _Rep < _Right._Rep;
}
_Ptr_base(const _Ptr_base&) = delete;
_Ptr_base& operator=(const _Ptr_base&) = delete;
protected:
_NODISCARD element_type* get() const noexcept {
return _Ptr;
}
constexpr _Ptr_base() noexcept = default;
~_Ptr_base() = default;
template <class _Ty2>
void _Move_construct_from(_Ptr_base<_Ty2>&& _Right) noexcept {
// implement shared_ptr's (converting) move ctor and weak_ptr's move ctor
_Ptr = _Right._Ptr;
_Rep = _Right._Rep;
_Right._Ptr = nullptr;
_Right._Rep = nullptr;
}
template <class _Ty2>
void _Copy_construct_from(const shared_ptr<_Ty2>& _Other) noexcept {
// implement shared_ptr's (converting) copy ctor
_Other._Incref();
_Ptr = _Other._Ptr;
_Rep = _Other._Rep;
}
template <class _Ty2>
void _Alias_construct_from(const shared_ptr<_Ty2>& _Other, element_type* _Px) noexcept {
// implement shared_ptr's aliasing ctor
_Other._Incref();
_Ptr = _Px;
_Rep = _Other._Rep;
}
template <class _Ty2>
void _Alias_move_construct_from(shared_ptr<_Ty2>&& _Other, element_type* _Px) noexcept {
// implement shared_ptr's aliasing move ctor
_Ptr = _Px;
_Rep = _Other._Rep;
_Other._Ptr = nullptr;
_Other._Rep = nullptr;
}
template <class _Ty0>
friend class weak_ptr; // specifically, weak_ptr::lock()
template <class _Ty2>
bool _Construct_from_weak(const weak_ptr<_Ty2>& _Other) noexcept {
// implement shared_ptr's ctor from weak_ptr, and weak_ptr::lock()
if (_Other._Rep && _Other._Rep->_Incref_nz()) {
_Ptr = _Other._Ptr;
_Rep = _Other._Rep;
return true;
}
return false;
}
void _Incref() const noexcept {
if (_Rep) {
_Rep->_Incref();
}
}
void _Decref() noexcept { // decrement reference count
if (_Rep) {
_Rep->_Decref();
}
}
void _Swap(_Ptr_base& _Right) noexcept { // swap pointers
_STD swap(_Ptr, _Right._Ptr);
_STD swap(_Rep, _Right._Rep);
}
template <class _Ty2>
void _Weakly_construct_from(const _Ptr_base<_Ty2>& _Other) noexcept { // implement weak_ptr's ctors
if (_Other._Rep) {
_Ptr = _Other._Ptr;
_Rep = _Other._Rep;
_Rep->_Incwref();
} else {
_STL_INTERNAL_CHECK(!_Ptr && !_Rep);
}
}
template <class _Ty2>
void _Weakly_convert_lvalue_avoiding_expired_conversions(const _Ptr_base<_Ty2>& _Other) noexcept {
// implement weak_ptr's copy converting ctor
if (_Other._Rep) {
_Rep = _Other._Rep; // always share ownership
_Rep->_Incwref();
if (_Rep->_Incref_nz()) {
_Ptr = _Other._Ptr; // keep resource alive during conversion, handling virtual inheritance
_Rep->_Decref();
} else {
_STL_INTERNAL_CHECK(!_Ptr);
}
} else {
_STL_INTERNAL_CHECK(!_Ptr && !_Rep);
}
}
template <class _Ty2>
void _Weakly_convert_rvalue_avoiding_expired_conversions(_Ptr_base<_Ty2>&& _Other) noexcept {
// implement weak_ptr's move converting ctor
_Rep = _Other._Rep; // always transfer ownership
_Other._Rep = nullptr;
if (_Rep && _Rep->_Incref_nz()) {
_Ptr = _Other._Ptr; // keep resource alive during conversion, handling virtual inheritance
_Rep->_Decref();
} else {
_STL_INTERNAL_CHECK(!_Ptr);
}
_Other._Ptr = nullptr;
}
void _Incwref() const noexcept {
if (_Rep) {
_Rep->_Incwref();
}
}
void _Decwref() noexcept { // decrement weak reference count
if (_Rep) {
_Rep->_Decwref();
}
}
private:
element_type* _Ptr{nullptr};
_Ref_count_base* _Rep{nullptr};
template <class _Ty0>
friend class _Ptr_base;
friend shared_ptr<_Ty>;
template <class _Ty0>
friend struct atomic;
friend _Exception_ptr_access;
#if _HAS_STATIC_RTTI
template <class _Dx, class _Ty0>
friend _Dx* get_deleter(const shared_ptr<_Ty0>& _Sx) noexcept;
#endif // _HAS_STATIC_RTTI
};
// TYPE TRAIT _Can_scalar_delete
template <class _Yty, class = void>
struct _Can_scalar_delete : false_type {};
template <class _Yty>
struct _Can_scalar_delete<_Yty, void_t<decltype(delete _STD declval<_Yty*>())>> : true_type {};
// TYPE TRAIT _Can_array_delete
template <class _Yty, class = void>
struct _Can_array_delete : false_type {};
template <class _Yty>
struct _Can_array_delete<_Yty, void_t<decltype(delete[] _STD declval<_Yty*>())>> : true_type {};
// TYPE TRAIT _Can_call_function_object
template <class _Fx, class _Arg, class = void>
struct _Can_call_function_object : false_type {};
template <class _Fx, class _Arg>
struct _Can_call_function_object<_Fx, _Arg, void_t<decltype(_STD declval<_Fx>()(_STD declval<_Arg>()))>> : true_type {};
// TYPE TRAIT _SP_convertible
template <class _Yty, class _Ty>
struct _SP_convertible : is_convertible<_Yty*, _Ty*>::type {};
template <class _Yty, class _Uty>
struct _SP_convertible<_Yty, _Uty[]> : is_convertible<_Yty (*)[], _Uty (*)[]>::type {};
template <class _Yty, class _Uty, size_t _Ext>
struct _SP_convertible<_Yty, _Uty[_Ext]> : is_convertible<_Yty (*)[_Ext], _Uty (*)[_Ext]>::type {};
// TYPE TRAIT _SP_pointer_compatible
template <class _Yty, class _Ty>
struct _SP_pointer_compatible : is_convertible<_Yty*, _Ty*>::type {
// N4659 [util.smartptr.shared]/5 "a pointer type Y* is said to be compatible
// with a pointer type T* " "when either Y* is convertible to T* ..."
};
template <class _Uty, size_t _Ext>
struct _SP_pointer_compatible<_Uty[_Ext], _Uty[]> : true_type {
// N4659 [util.smartptr.shared]/5 "... or Y is U[N] and T is cv U[]."
};
template <class _Uty, size_t _Ext>
struct _SP_pointer_compatible<_Uty[_Ext], const _Uty[]> : true_type {
// N4659 [util.smartptr.shared]/5 "... or Y is U[N] and T is cv U[]."
};
template <class _Uty, size_t _Ext>
struct _SP_pointer_compatible<_Uty[_Ext], volatile _Uty[]> : true_type {
// N4659 [util.smartptr.shared]/5 "... or Y is U[N] and T is cv U[]."
};
template <class _Uty, size_t _Ext>
struct _SP_pointer_compatible<_Uty[_Ext], const volatile _Uty[]> : true_type {
// N4659 [util.smartptr.shared]/5 "... or Y is U[N] and T is cv U[]."
};
// CLASS TEMPLATE shared_ptr
template <class _Ux>
struct _Temporary_owner {
_Ux* _Ptr;
explicit _Temporary_owner(_Ux* const _Ptr_) noexcept : _Ptr(_Ptr_) {}
_Temporary_owner(const _Temporary_owner&) = delete;
_Temporary_owner& operator=(const _Temporary_owner&) = delete;
~_Temporary_owner() {
delete _Ptr;
}
};
template <class _UxptrOrNullptr, class _Dx>
struct _Temporary_owner_del {
_UxptrOrNullptr _Ptr;
_Dx& _Dt;
bool _Call_deleter = true;
explicit _Temporary_owner_del(const _UxptrOrNullptr _Ptr_, _Dx& _Dt_) noexcept : _Ptr(_Ptr_), _Dt(_Dt_) {}
_Temporary_owner_del(const _Temporary_owner_del&) = delete;
_Temporary_owner_del& operator=(const _Temporary_owner_del&) = delete;
~_Temporary_owner_del() {
if (_Call_deleter) {
_Dt(_Ptr);
}
}
};
template <class _Ty>
class shared_ptr : public _Ptr_base<_Ty> { // class for reference counted resource management
private:
using _Mybase = _Ptr_base<_Ty>;
public:
using typename _Mybase::element_type;
#if _HAS_CXX17
using weak_type = weak_ptr<_Ty>;
#endif // _HAS_CXX17
constexpr shared_ptr() noexcept = default;
constexpr shared_ptr(nullptr_t) noexcept {} // construct empty shared_ptr
template <class _Ux,
enable_if_t<conjunction_v<conditional_t<is_array_v<_Ty>, _Can_array_delete<_Ux>, _Can_scalar_delete<_Ux>>,
_SP_convertible<_Ux, _Ty>>,
int> = 0>
explicit shared_ptr(_Ux* _Px) { // construct shared_ptr object that owns _Px
if constexpr (is_array_v<_Ty>) {
_Setpd(_Px, default_delete<_Ux[]>{});
} else {
_Temporary_owner<_Ux> _Owner(_Px);
_Set_ptr_rep_and_enable_shared(_Owner._Ptr, new _Ref_count<_Ux>(_Owner._Ptr));
_Owner._Ptr = nullptr;
}
}
template <class _Ux, class _Dx,
enable_if_t<conjunction_v<is_move_constructible<_Dx>, _Can_call_function_object<_Dx&, _Ux*&>,
_SP_convertible<_Ux, _Ty>>,
int> = 0>
shared_ptr(_Ux* _Px, _Dx _Dt) { // construct with _Px, deleter
_Setpd(_Px, _STD move(_Dt));
}
template <class _Ux, class _Dx, class _Alloc,
enable_if_t<conjunction_v<is_move_constructible<_Dx>, _Can_call_function_object<_Dx&, _Ux*&>,
_SP_convertible<_Ux, _Ty>>,
int> = 0>
shared_ptr(_Ux* _Px, _Dx _Dt, _Alloc _Ax) { // construct with _Px, deleter, allocator
_Setpda(_Px, _STD move(_Dt), _Ax);
}
template <class _Dx,
enable_if_t<conjunction_v<is_move_constructible<_Dx>, _Can_call_function_object<_Dx&, nullptr_t&>>, int> = 0>
shared_ptr(nullptr_t, _Dx _Dt) { // construct with nullptr, deleter
_Setpd(nullptr, _STD move(_Dt));
}
template <class _Dx, class _Alloc,
enable_if_t<conjunction_v<is_move_constructible<_Dx>, _Can_call_function_object<_Dx&, nullptr_t&>>, int> = 0>
shared_ptr(nullptr_t, _Dx _Dt, _Alloc _Ax) { // construct with nullptr, deleter, allocator
_Setpda(nullptr, _STD move(_Dt), _Ax);
}
template <class _Ty2>
shared_ptr(const shared_ptr<_Ty2>& _Right, element_type* _Px) noexcept {
// construct shared_ptr object that aliases _Right
this->_Alias_construct_from(_Right, _Px);
}
template <class _Ty2>
shared_ptr(shared_ptr<_Ty2>&& _Right, element_type* _Px) noexcept {
// move construct shared_ptr object that aliases _Right
this->_Alias_move_construct_from(_STD move(_Right), _Px);
}
shared_ptr(const shared_ptr& _Other) noexcept { // construct shared_ptr object that owns same resource as _Other
this->_Copy_construct_from(_Other);
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
shared_ptr(const shared_ptr<_Ty2>& _Other) noexcept {
// construct shared_ptr object that owns same resource as _Other
this->_Copy_construct_from(_Other);
}
shared_ptr(shared_ptr&& _Right) noexcept { // construct shared_ptr object that takes resource from _Right
this->_Move_construct_from(_STD move(_Right));
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
shared_ptr(shared_ptr<_Ty2>&& _Right) noexcept { // construct shared_ptr object that takes resource from _Right
this->_Move_construct_from(_STD move(_Right));
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
explicit shared_ptr(const weak_ptr<_Ty2>& _Other) { // construct shared_ptr object that owns resource *_Other
if (!this->_Construct_from_weak(_Other)) {
_Throw_bad_weak_ptr();
}
}
#if _HAS_AUTO_PTR_ETC
template <class _Ty2, enable_if_t<is_convertible_v<_Ty2*, _Ty*>, int> = 0>
shared_ptr(auto_ptr<_Ty2>&& _Other) { // construct shared_ptr object that owns *_Other.get()
_Ty2* _Px = _Other.get();
_Set_ptr_rep_and_enable_shared(_Px, new _Ref_count<_Ty2>(_Px));
_Other.release();
}
#endif // _HAS_AUTO_PTR_ETC
template <class _Ux, class _Dx,
enable_if_t<conjunction_v<_SP_pointer_compatible<_Ux, _Ty>,
is_convertible<typename unique_ptr<_Ux, _Dx>::pointer, element_type*>>,
int> = 0>
shared_ptr(unique_ptr<_Ux, _Dx>&& _Other) {
using _Fancy_t = typename unique_ptr<_Ux, _Dx>::pointer;
using _Raw_t = typename unique_ptr<_Ux, _Dx>::element_type*;
using _Deleter_t = conditional_t<is_reference_v<_Dx>, decltype(_STD ref(_Other.get_deleter())), _Dx>;
const _Fancy_t _Fancy = _Other.get();
if (_Fancy) {
const _Raw_t _Raw = _Fancy;
const auto _Rx =
new _Ref_count_resource<_Fancy_t, _Deleter_t>(_Fancy, _STD forward<_Dx>(_Other.get_deleter()));
_Set_ptr_rep_and_enable_shared(_Raw, _Rx);
_Other.release();
}
}
~shared_ptr() noexcept { // release resource
this->_Decref();
}
shared_ptr& operator=(const shared_ptr& _Right) noexcept {
shared_ptr(_Right).swap(*this);
return *this;
}
template <class _Ty2>
shared_ptr& operator=(const shared_ptr<_Ty2>& _Right) noexcept {
shared_ptr(_Right).swap(*this);
return *this;
}
shared_ptr& operator=(shared_ptr&& _Right) noexcept { // take resource from _Right
shared_ptr(_STD move(_Right)).swap(*this);
return *this;
}
template <class _Ty2>
shared_ptr& operator=(shared_ptr<_Ty2>&& _Right) noexcept { // take resource from _Right
shared_ptr(_STD move(_Right)).swap(*this);
return *this;
}
#if _HAS_AUTO_PTR_ETC
template <class _Ty2>
shared_ptr& operator=(auto_ptr<_Ty2>&& _Right) {
shared_ptr(_STD move(_Right)).swap(*this);
return *this;
}
#endif // _HAS_AUTO_PTR_ETC
template <class _Ux, class _Dx>
shared_ptr& operator=(unique_ptr<_Ux, _Dx>&& _Right) { // move from unique_ptr
shared_ptr(_STD move(_Right)).swap(*this);
return *this;
}
void swap(shared_ptr& _Other) noexcept {
this->_Swap(_Other);
}
void reset() noexcept { // release resource and convert to empty shared_ptr object
shared_ptr().swap(*this);
}
template <class _Ux>
void reset(_Ux* _Px) { // release, take ownership of _Px
shared_ptr(_Px).swap(*this);
}
template <class _Ux, class _Dx>
void reset(_Ux* _Px, _Dx _Dt) { // release, take ownership of _Px, with deleter _Dt
shared_ptr(_Px, _Dt).swap(*this);
}
template <class _Ux, class _Dx, class _Alloc>
void reset(_Ux* _Px, _Dx _Dt, _Alloc _Ax) { // release, take ownership of _Px, with deleter _Dt, allocator _Ax
shared_ptr(_Px, _Dt, _Ax).swap(*this);
}
using _Mybase::get;
template <class _Ty2 = _Ty, enable_if_t<!disjunction_v<is_array<_Ty2>, is_void<_Ty2>>, int> = 0>
_NODISCARD _Ty2& operator*() const noexcept {
return *get();
}
template <class _Ty2 = _Ty, enable_if_t<!is_array_v<_Ty2>, int> = 0>
_NODISCARD _Ty2* operator->() const noexcept {
return get();
}
template <class _Ty2 = _Ty, class _Elem = element_type, enable_if_t<is_array_v<_Ty2>, int> = 0>
_NODISCARD _Elem& operator[](ptrdiff_t _Idx) const noexcept /* strengthened */ {
return get()[_Idx];
}
#if _HAS_DEPRECATED_SHARED_PTR_UNIQUE
_CXX17_DEPRECATE_SHARED_PTR_UNIQUE _NODISCARD bool unique() const noexcept {
// return true if no other shared_ptr object owns this resource
return this->use_count() == 1;
}
#endif // _HAS_DEPRECATED_SHARED_PTR_UNIQUE
explicit operator bool() const noexcept {
return get() != nullptr;
}
private:
template <class _UxptrOrNullptr, class _Dx>
void _Setpd(const _UxptrOrNullptr _Px, _Dx _Dt) { // take ownership of _Px, deleter _Dt
_Temporary_owner_del<_UxptrOrNullptr, _Dx> _Owner(_Px, _Dt);
_Set_ptr_rep_and_enable_shared(
_Owner._Ptr, new _Ref_count_resource<_UxptrOrNullptr, _Dx>(_Owner._Ptr, _STD move(_Dt)));
_Owner._Call_deleter = false;
}
template <class _UxptrOrNullptr, class _Dx, class _Alloc>
void _Setpda(const _UxptrOrNullptr _Px, _Dx _Dt, _Alloc _Ax) { // take ownership of _Px, deleter _Dt, allocator _Ax
using _Alref_alloc = _Rebind_alloc_t<_Alloc, _Ref_count_resource_alloc<_UxptrOrNullptr, _Dx, _Alloc>>;
_Temporary_owner_del<_UxptrOrNullptr, _Dx> _Owner(_Px, _Dt);
_Alref_alloc _Alref(_Ax);
_Alloc_construct_ptr<_Alref_alloc> _Constructor(_Alref);
_Constructor._Allocate();
_Construct_in_place(*_Constructor._Ptr, _Owner._Ptr, _STD move(_Dt), _Ax);
_Set_ptr_rep_and_enable_shared(_Owner._Ptr, _Unfancy(_Constructor._Ptr));
_Constructor._Ptr = nullptr;
_Owner._Call_deleter = false;
}
#if _HAS_CXX20
template <class _Ty0, class... _Types>
friend enable_if_t<!is_array_v<_Ty0>, shared_ptr<_Ty0>> make_shared(_Types&&... _Args);
template <class _Ty0, class _Alloc, class... _Types>
friend enable_if_t<!is_array_v<_Ty0>, shared_ptr<_Ty0>> allocate_shared(const _Alloc& _Al_arg, _Types&&... _Args);
template <class _Ty0>
friend enable_if_t<is_bounded_array_v<_Ty0>, shared_ptr<_Ty0>> make_shared();
template <class _Ty0, class _Alloc>
friend enable_if_t<is_bounded_array_v<_Ty0>, shared_ptr<_Ty0>> allocate_shared(const _Alloc& _Al_arg);
template <class _Ty0>
friend enable_if_t<is_bounded_array_v<_Ty0>, shared_ptr<_Ty0>> make_shared(const remove_extent_t<_Ty0>& _Val);
template <class _Ty0, class _Alloc>
friend enable_if_t<is_bounded_array_v<_Ty0>, shared_ptr<_Ty0>> allocate_shared(
const _Alloc& _Al_arg, const remove_extent_t<_Ty0>& _Val);
template <class _Ty0>
friend enable_if_t<!is_unbounded_array_v<_Ty0>, shared_ptr<_Ty0>> make_shared_for_overwrite();
template <class _Ty0, class _Alloc>
friend enable_if_t<!is_unbounded_array_v<_Ty0>, shared_ptr<_Ty0>> allocate_shared_for_overwrite(
const _Alloc& _Al_arg);
template <class _Ty0, class... _ArgTypes>
friend shared_ptr<_Ty0> _Make_shared_unbounded_array(size_t _Count, const _ArgTypes&... _Args);
template <class _Ty0, class _Alloc, class... _ArgTypes>
friend shared_ptr<_Ty0> _Allocate_shared_unbounded_array(
const _Alloc& _Al, size_t _Count, const _ArgTypes&... _Args);
#else // ^^^ _HAS_CXX20 / !_HAS_CXX20 vvv
template <class _Ty0, class... _Types>
friend shared_ptr<_Ty0> make_shared(_Types&&... _Args);
template <class _Ty0, class _Alloc, class... _Types>
friend shared_ptr<_Ty0> allocate_shared(const _Alloc& _Al_arg, _Types&&... _Args);
#endif // !_HAS_CXX20
template <class _Ux>
void _Set_ptr_rep_and_enable_shared(_Ux* const _Px, _Ref_count_base* const _Rx) noexcept { // take ownership of _Px
this->_Ptr = _Px;
this->_Rep = _Rx;
if constexpr (conjunction_v<negation<is_array<_Ty>>, negation<is_volatile<_Ux>>, _Can_enable_shared<_Ux>>) {
if (_Px && _Px->_Wptr.expired()) {
_Px->_Wptr = shared_ptr<remove_cv_t<_Ux>>(*this, const_cast<remove_cv_t<_Ux>*>(_Px));
}
}
}
void _Set_ptr_rep_and_enable_shared(nullptr_t, _Ref_count_base* const _Rx) noexcept { // take ownership of nullptr
this->_Ptr = nullptr;
this->_Rep = _Rx;
}
};
#if _HAS_CXX17
template <class _Ty>
shared_ptr(weak_ptr<_Ty>) -> shared_ptr<_Ty>;
template <class _Ty, class _Dx>
shared_ptr(unique_ptr<_Ty, _Dx>) -> shared_ptr<_Ty>;
#endif // _HAS_CXX17
template <class _Ty1, class _Ty2>
_NODISCARD bool operator==(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() == _Right.get();
}
#if _HAS_CXX20
template <class _Ty1, class _Ty2>
_NODISCARD strong_ordering operator<=>(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() <=> _Right.get();
}
#else // ^^^ _HAS_CXX20 / !_HAS_CXX20 vvv
template <class _Ty1, class _Ty2>
_NODISCARD bool operator!=(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() != _Right.get();
}
template <class _Ty1, class _Ty2>
_NODISCARD bool operator<(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() < _Right.get();
}
template <class _Ty1, class _Ty2>
_NODISCARD bool operator>=(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() >= _Right.get();
}
template <class _Ty1, class _Ty2>
_NODISCARD bool operator>(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() > _Right.get();
}
template <class _Ty1, class _Ty2>
_NODISCARD bool operator<=(const shared_ptr<_Ty1>& _Left, const shared_ptr<_Ty2>& _Right) noexcept {
return _Left.get() <= _Right.get();
}
#endif // ^^^ !_HAS_CXX20 ^^^
template <class _Ty>
_NODISCARD bool operator==(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() == nullptr;
}
#if _HAS_CXX20
template <class _Ty>
_NODISCARD strong_ordering operator<=>(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() <=> static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr);
}
#else // ^^^ _HAS_CXX20 / !_HAS_CXX20 vvv
template <class _Ty>
_NODISCARD bool operator==(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return nullptr == _Right.get();
}
template <class _Ty>
_NODISCARD bool operator!=(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() != nullptr;
}
template <class _Ty>
_NODISCARD bool operator!=(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return nullptr != _Right.get();
}
template <class _Ty>
_NODISCARD bool operator<(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() < static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr);
}
template <class _Ty>
_NODISCARD bool operator<(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr) < _Right.get();
}
template <class _Ty>
_NODISCARD bool operator>=(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() >= static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr);
}
template <class _Ty>
_NODISCARD bool operator>=(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr) >= _Right.get();
}
template <class _Ty>
_NODISCARD bool operator>(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() > static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr);
}
template <class _Ty>
_NODISCARD bool operator>(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr) > _Right.get();
}
template <class _Ty>
_NODISCARD bool operator<=(const shared_ptr<_Ty>& _Left, nullptr_t) noexcept {
return _Left.get() <= static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr);
}
template <class _Ty>
_NODISCARD bool operator<=(nullptr_t, const shared_ptr<_Ty>& _Right) noexcept {
return static_cast<typename shared_ptr<_Ty>::element_type*>(nullptr) <= _Right.get();
}
#endif // ^^^ !_HAS_CXX20 ^^^
template <class _Elem, class _Traits, class _Ty>
basic_ostream<_Elem, _Traits>& operator<<(basic_ostream<_Elem, _Traits>& _Out, const shared_ptr<_Ty>& _Px) {
// write contained pointer to stream
return _Out << _Px.get();
}
template <class _Ty>
void swap(shared_ptr<_Ty>& _Left, shared_ptr<_Ty>& _Right) noexcept {
_Left.swap(_Right);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> static_pointer_cast(const shared_ptr<_Ty2>& _Other) noexcept {
// static_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = static_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_Other, _Ptr);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> static_pointer_cast(shared_ptr<_Ty2>&& _Other) noexcept {
// static_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = static_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_STD move(_Other), _Ptr);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> const_pointer_cast(const shared_ptr<_Ty2>& _Other) noexcept {
// const_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = const_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_Other, _Ptr);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> const_pointer_cast(shared_ptr<_Ty2>&& _Other) noexcept {
// const_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = const_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_STD move(_Other), _Ptr);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> reinterpret_pointer_cast(const shared_ptr<_Ty2>& _Other) noexcept {
// reinterpret_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = reinterpret_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_Other, _Ptr);
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> reinterpret_pointer_cast(shared_ptr<_Ty2>&& _Other) noexcept {
// reinterpret_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = reinterpret_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
return shared_ptr<_Ty1>(_STD move(_Other), _Ptr);
}
#ifdef _CPPRTTI
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> dynamic_pointer_cast(const shared_ptr<_Ty2>& _Other) noexcept {
// dynamic_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = dynamic_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
if (_Ptr) {
return shared_ptr<_Ty1>(_Other, _Ptr);
}
return {};
}
template <class _Ty1, class _Ty2>
_NODISCARD shared_ptr<_Ty1> dynamic_pointer_cast(shared_ptr<_Ty2>&& _Other) noexcept {
// dynamic_cast for shared_ptr that properly respects the reference count control block
const auto _Ptr = dynamic_cast<typename shared_ptr<_Ty1>::element_type*>(_Other.get());
if (_Ptr) {
return shared_ptr<_Ty1>(_STD move(_Other), _Ptr);
}
return {};
}
#else // _CPPRTTI
template <class _Ty1, class _Ty2>
shared_ptr<_Ty1> dynamic_pointer_cast(const shared_ptr<_Ty2>&) noexcept = delete; // requires /GR option
template <class _Ty1, class _Ty2>
shared_ptr<_Ty1> dynamic_pointer_cast(shared_ptr<_Ty2>&&) noexcept = delete; // requires /GR option
#endif // _CPPRTTI
#if _HAS_STATIC_RTTI
template <class _Dx, class _Ty>
_NODISCARD _Dx* get_deleter(const shared_ptr<_Ty>& _Sx) noexcept {
// return pointer to shared_ptr's deleter object if its type is _Dx
if (_Sx._Rep) {
return static_cast<_Dx*>(_Sx._Rep->_Get_deleter(typeid(_Dx)));
}
return nullptr;
}
#else // _HAS_STATIC_RTTI
template <class _Dx, class _Ty>
_Dx* get_deleter(const shared_ptr<_Ty>&) noexcept = delete; // requires static RTTI
#endif // _HAS_STATIC_RTTI
#if _HAS_CXX20
struct _For_overwrite_tag {
explicit _For_overwrite_tag() = default;
};
#endif // _HAS_CXX20
// CLASS TEMPLATE _Ref_count_obj2
template <class _Ty>
class _Ref_count_obj2 : public _Ref_count_base { // handle reference counting for object in control block, no allocator
public:
template <class... _Types>
explicit _Ref_count_obj2(_Types&&... _Args) : _Ref_count_base() {
#if _HAS_CXX20
if constexpr (sizeof...(_Types) == 1 && (is_same_v<_For_overwrite_tag, remove_cvref_t<_Types>> && ...)) {
_Default_construct_in_place(_Storage._Value);
((void) _Args, ...);
} else
#endif // _HAS_CXX20
{
_Construct_in_place(_Storage._Value, _STD forward<_Types>(_Args)...);
}
}
virtual ~_Ref_count_obj2() noexcept override { // TRANSITION, should be non-virtual
// nothing to do, _Storage._Value was already destroyed in _Destroy
// N4849 [class.dtor]/7:
// "A defaulted destructor for a class X is defined as deleted if:
// X is a union-like class that has a variant member with a non-trivial destructor"
}
union {
_Wrap<_Ty> _Storage;
};
private:
virtual void _Destroy() noexcept override { // destroy managed resource
_Destroy_in_place(_Storage._Value);
}
virtual void _Delete_this() noexcept override { // destroy self
delete this;
}
};
#if _HAS_CXX20
template <size_t _Align>
struct _Alignas_storage_unit {
alignas(_Align) char _Space[_Align];
};
enum class _Check_overflow : bool { _Nope, _Yes };
template <class _Refc, _Check_overflow _Check>
_NODISCARD size_t _Calculate_bytes_for_flexible_array(const size_t _Count) noexcept(_Check == _Check_overflow::_Nope) {
constexpr size_t _Align = alignof(_Refc);
size_t _Bytes = sizeof(_Refc); // contains storage for one element
if (_Count > 1) {
constexpr size_t _Element_size = sizeof(typename _Refc::_Element_type);
size_t _Extra_bytes;
if constexpr (_Check == _Check_overflow::_Yes) {
_Extra_bytes = _Get_size_of_n<_Element_size>(_Count - 1); // check multiplication overflow
if (_Extra_bytes > static_cast<size_t>(-1) - _Bytes - (_Align - 1)) { // assume worst case adjustment
_Throw_bad_array_new_length(); // addition overflow
}
} else {
_Extra_bytes = _Element_size * (_Count - 1);
}
_Bytes += _Extra_bytes;
_Bytes = (_Bytes + _Align - 1) & ~(_Align - 1);
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
using _Storage = _Alignas_storage_unit<_Align>;
_STL_INTERNAL_CHECK(_Bytes % sizeof(_Storage) == 0);
#endif // _ENABLE_STL_INTERNAL_CHECK
return _Bytes;
}
template <class _Refc>
_NODISCARD _Refc* _Allocate_flexible_array(const size_t _Count) {
const size_t _Bytes = _Calculate_bytes_for_flexible_array<_Refc, _Check_overflow::_Yes>(_Count);
constexpr size_t _Align = alignof(_Refc);
#ifdef __cpp_aligned_new
if constexpr (_Align > __STDCPP_DEFAULT_NEW_ALIGNMENT__) {
return static_cast<_Refc*>(::operator new (_Bytes, align_val_t{_Align}));
} else
#endif // __cpp_aligned_new
{
return static_cast<_Refc*>(::operator new(_Bytes));
}
}
template <class _Refc>
void _Deallocate_flexible_array(_Refc* const _Ptr) noexcept {
constexpr size_t _Align = alignof(_Refc);
#ifdef __cpp_aligned_new
if constexpr (_Align > __STDCPP_DEFAULT_NEW_ALIGNMENT__) {
::operator delete (static_cast<void*>(_Ptr), align_val_t{_Align});
} else
#endif // __cpp_aligned_new
{
::operator delete(static_cast<void*>(_Ptr));
}
}
template <class _NoThrowIt>
struct _NODISCARD _Uninitialized_rev_destroying_backout {
// struct to undo partially constructed ranges in _Uninitialized_xxx algorithms
_NoThrowIt _First;
_NoThrowIt _Last;
explicit _Uninitialized_rev_destroying_backout(_NoThrowIt _Dest) noexcept : _First(_Dest), _Last(_Dest) {}
_Uninitialized_rev_destroying_backout(const _Uninitialized_rev_destroying_backout&) = delete;
_Uninitialized_rev_destroying_backout& operator=(const _Uninitialized_rev_destroying_backout&) = delete;
~_Uninitialized_rev_destroying_backout() {
while (_Last != _First) {
--_Last;
_STD destroy_at(_STD addressof(*_Last));
}
}
template <class... _Types>
void _Emplace_back(_Types&&... _Vals) { // construct a new element at *_Last and increment
_Construct_in_place(*_Last, _STD forward<_Types>(_Vals)...);
++_Last;
}
void _Emplace_back_for_overwrite() {
_Default_construct_in_place(*_Last);
++_Last;
}
_NoThrowIt _Release() noexcept { // suppress any exception handling backout and return _Last
_First = _Last;
return _Last;
}
};
template <class _Ty>
void _Reverse_destroy_multidimensional_n(_Ty* const _Arr, size_t _Size) noexcept {
while (_Size > 0) {
--_Size;
if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n(_Arr[_Size], extent_v<_Ty>);
} else {
_Destroy_in_place(_Arr[_Size]);
}
}
}
template <class _Ty>
struct _NODISCARD _Reverse_destroy_multidimensional_n_guard {
_Ty* _Target;
size_t _Index;
~_Reverse_destroy_multidimensional_n_guard() {
if (_Target) {
_Reverse_destroy_multidimensional_n(_Target, _Index);
}
}
};
template <class _Ty, size_t _Size>
void _Uninitialized_copy_multidimensional(const _Ty (&_In)[_Size], _Ty (&_Out)[_Size]) {
if constexpr (is_trivial_v<_Ty>) {
_Copy_memmove(_In, _In + _Size, _Out);
} else if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_guard<_Ty> _Guard{_Out, 0};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_copy_multidimensional(_In[_Idx], _Out[_Idx]);
}
_Guard._Target = nullptr;
} else {
_Uninitialized_rev_destroying_backout _Backout{_Out};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back(_In[_Idx]);
}
_Backout._Release();
}
}
template <class _Ty>
void _Uninitialized_value_construct_multidimensional_n(_Ty* const _Out, const size_t _Size) {
using _Item = remove_all_extents_t<_Ty>;
if constexpr (_Use_memset_value_construct_v<_Item*>) {
_Zero_range(_Out, _Out + _Size);
} else if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_guard<_Ty> _Guard{_Out, 0};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_value_construct_multidimensional_n(_Out[_Idx], extent_v<_Ty>);
}
_Guard._Target = nullptr;
} else {
_Uninitialized_rev_destroying_backout _Backout{_Out};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back();
}
_Backout._Release();
}
}
template <class _Ty>
void _Uninitialized_default_construct_multidimensional_n(_Ty* const _Out, const size_t _Size) {
if constexpr (!is_trivially_default_constructible_v<_Ty>) {
if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_guard<_Ty> _Guard{_Out, 0};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_default_construct_multidimensional_n(_Out[_Idx], extent_v<_Ty>);
}
_Guard._Target = nullptr;
} else {
_Uninitialized_rev_destroying_backout _Backout{_Out};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back_for_overwrite();
}
_Backout._Release();
}
}
}
template <class _Ty>
void _Uninitialized_fill_multidimensional_n(_Ty* const _Out, const size_t _Size, const _Ty& _Val) {
if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_guard<_Ty> _Guard{_Out, 0};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_copy_multidimensional(_Val, _Out[_Idx]); // intentionally copy, not fill
}
_Guard._Target = nullptr;
} else if constexpr (_Fill_memset_is_safe<_Ty*, _Ty>) {
_Fill_memset(_Out, _Val, _Size);
} else {
if constexpr (_Fill_zero_memset_is_safe<_Ty*, _Ty>) {
if (_Is_all_bits_zero(_Val)) {
_Fill_zero_memset(_Out, _Size);
return;
}
}
_Uninitialized_rev_destroying_backout _Backout{_Out};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back(_Val);
}
_Backout._Release();
}
}
// CLASS TEMPLATE _Ref_count_unbounded_array
template <class _Ty, bool = is_trivially_destructible_v<remove_extent_t<_Ty>>>
class _Ref_count_unbounded_array : public _Ref_count_base {
// handle reference counting for unbounded array with trivial destruction in control block, no allocator
public:
static_assert(is_unbounded_array_v<_Ty>);
using _Element_type = remove_extent_t<_Ty>;
explicit _Ref_count_unbounded_array(const size_t _Count) : _Ref_count_base() {
_Uninitialized_value_construct_multidimensional_n(_Get_ptr(), _Count);
}
template <class _Arg>
explicit _Ref_count_unbounded_array(const size_t _Count, const _Arg& _Val) : _Ref_count_base() {
if constexpr (is_same_v<_For_overwrite_tag, _Arg>) {
_Uninitialized_default_construct_multidimensional_n(_Get_ptr(), _Count);
} else {
_Uninitialized_fill_multidimensional_n(_Get_ptr(), _Count, _Val);
}
}
_NODISCARD auto _Get_ptr() noexcept {
return _STD addressof(_Storage._Value);
}
private:
union {
_Wrap<_Element_type> _Storage; // flexible array must be last member
};
virtual ~_Ref_count_unbounded_array() noexcept override { // TRANSITION, should be non-virtual
// nothing to do, _Ty is trivially destructible
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
// nothing to do, _Ty is trivially destructible
}
virtual void _Delete_this() noexcept override { // destroy self
this->~_Ref_count_unbounded_array();
_Deallocate_flexible_array(this);
}
};
template <class _Ty>
class _Ref_count_unbounded_array<_Ty, false> : public _Ref_count_base {
// handle reference counting for unbounded array with non-trivial destruction in control block, no allocator
public:
static_assert(is_unbounded_array_v<_Ty>);
using _Element_type = remove_extent_t<_Ty>;
explicit _Ref_count_unbounded_array(const size_t _Count) : _Ref_count_base(), _Size(_Count) {
_Uninitialized_value_construct_multidimensional_n(_Get_ptr(), _Size);
}
template <class _Arg>
explicit _Ref_count_unbounded_array(const size_t _Count, const _Arg& _Val) : _Ref_count_base(), _Size(_Count) {
if constexpr (is_same_v<_For_overwrite_tag, _Arg>) {
_Uninitialized_default_construct_multidimensional_n(_Get_ptr(), _Size);
} else {
_Uninitialized_fill_multidimensional_n(_Get_ptr(), _Size, _Val);
}
}
_NODISCARD auto _Get_ptr() noexcept {
return _STD addressof(_Storage._Value);
}
private:
size_t _Size;
union {
_Wrap<_Element_type> _Storage; // flexible array must be last member
};
virtual ~_Ref_count_unbounded_array() noexcept override { // TRANSITION, should be non-virtual
// nothing to do, _Storage was already destroyed in _Destroy
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
_Reverse_destroy_multidimensional_n(_Get_ptr(), _Size);
}
virtual void _Delete_this() noexcept override { // destroy self
this->~_Ref_count_unbounded_array();
_Deallocate_flexible_array(this);
}
};
// CLASS TEMPLATE _Ref_count_bounded_array
template <class _Ty>
class _Ref_count_bounded_array : public _Ref_count_base {
// handle reference counting for bounded array in control block, no allocator
public:
static_assert(is_bounded_array_v<_Ty>);
_Ref_count_bounded_array() : _Ref_count_base(), _Storage() {} // value-initializing _Storage is necessary here
template <class _Arg>
explicit _Ref_count_bounded_array(const _Arg& _Val) : _Ref_count_base() { // don't value-initialize _Storage
if constexpr (is_same_v<_For_overwrite_tag, _Arg>) {
_Uninitialized_default_construct_multidimensional_n(_Storage._Value, extent_v<_Ty>);
} else {
_Uninitialized_fill_multidimensional_n(_Storage._Value, extent_v<_Ty>, _Val);
}
}
union {
_Wrap<_Ty> _Storage;
};
private:
virtual ~_Ref_count_bounded_array() noexcept override { // TRANSITION, should be non-virtual
// nothing to do, _Storage was already destroyed in _Destroy
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
_Destroy_in_place(_Storage); // not _Storage._Value, see N4849 [expr.prim.id.dtor]
}
virtual void _Delete_this() noexcept override { // destroy self
delete this;
}
};
#endif // _HAS_CXX20
// CLASS TEMPLATE _Ebco_base
template <class _Ty,
bool = is_empty_v<_Ty> && !is_final_v<_Ty>>
class _Ebco_base : private _Ty { // Empty Base Class Optimization, active
private:
using _Mybase = _Ty; // for visualization
protected:
template <class _Other, enable_if_t<!is_same_v<_Remove_cvref_t<_Other>, _Ebco_base>, int> = 0>
constexpr explicit _Ebco_base(_Other&& _Val) noexcept(is_nothrow_constructible_v<_Ty, _Other>)
: _Ty(_STD forward<_Other>(_Val)) {}
constexpr _Ty& _Get_val() noexcept {
return *this;
}
constexpr const _Ty& _Get_val() const noexcept {
return *this;
}
};
template <class _Ty>
class _Ebco_base<_Ty, false> { // Empty Base Class Optimization, inactive
private:
_Ty _Myval;
protected:
template <class _Other, enable_if_t<!is_same_v<_Remove_cvref_t<_Other>, _Ebco_base>, int> = 0>
constexpr explicit _Ebco_base(_Other&& _Val) noexcept(is_nothrow_constructible_v<_Ty, _Other>)
: _Myval(_STD forward<_Other>(_Val)) {}
constexpr _Ty& _Get_val() noexcept {
return _Myval;
}
constexpr const _Ty& _Get_val() const noexcept {
return _Myval;
}
};
// CLASS TEMPLATE _Ref_count_obj_alloc3
template <class _Ty, class _Alloc>
class _Ref_count_obj_alloc3 : public _Ebco_base<_Rebind_alloc_t<_Alloc, _Ty>>, public _Ref_count_base {
// handle reference counting for object in control block, allocator
private:
static_assert(is_same_v<_Ty, remove_cv_t<_Ty>>, "allocate_shared should remove_cv_t");
using _Rebound = _Rebind_alloc_t<_Alloc, _Ty>;
public:
template <class... _Types>
explicit _Ref_count_obj_alloc3(const _Alloc& _Al_arg, _Types&&... _Args)
: _Ebco_base<_Rebound>(_Al_arg), _Ref_count_base() {
#if _HAS_CXX20
if constexpr (sizeof...(_Types) == 1 && (is_same_v<_For_overwrite_tag, remove_cvref_t<_Types>> && ...)) {
_Default_construct_in_place(_Storage._Value);
((void) _Args, ...);
} else
#endif // _HAS_CXX20
{
allocator_traits<_Rebound>::construct(
this->_Get_val(), _STD addressof(_Storage._Value), _STD forward<_Types>(_Args)...);
}
}
union {
_Wrap<_Ty> _Storage;
};
private:
virtual ~_Ref_count_obj_alloc3() noexcept override { // TRANSITION, should be non-virtual
// nothing to do; _Storage._Value already destroyed by _Destroy()
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
allocator_traits<_Rebound>::destroy(this->_Get_val(), _STD addressof(_Storage._Value));
}
virtual void _Delete_this() noexcept override { // destroy self
_Rebind_alloc_t<_Alloc, _Ref_count_obj_alloc3> _Al(this->_Get_val());
this->~_Ref_count_obj_alloc3();
_Deallocate_plain(_Al, this);
}
};
#if _HAS_CXX20
template <class _Alloc>
class _NODISCARD _Uninitialized_rev_destroying_backout_al {
// class to undo partially constructed ranges in _Uninitialized_xxx_al algorithms
private:
using pointer = _Alloc_ptr_t<_Alloc>;
public:
_Uninitialized_rev_destroying_backout_al(pointer _Dest, _Alloc& _Al_) noexcept
: _First(_Dest), _Last(_Dest), _Al(_Al_) {}
_Uninitialized_rev_destroying_backout_al(const _Uninitialized_rev_destroying_backout_al&) = delete;
_Uninitialized_rev_destroying_backout_al& operator=(const _Uninitialized_rev_destroying_backout_al&) = delete;
~_Uninitialized_rev_destroying_backout_al() {
while (_Last != _First) {
--_Last;
allocator_traits<_Alloc>::destroy(_Al, _Last);
}
}
template <class... _Types>
void _Emplace_back(_Types&&... _Vals) { // construct a new element at *_Last and increment
allocator_traits<_Alloc>::construct(_Al, _Unfancy(_Last), _STD forward<_Types>(_Vals)...);
++_Last;
}
pointer _Release() noexcept { // suppress any exception handling backout and return _Last
_First = _Last;
return _Last;
}
private:
pointer _First;
pointer _Last;
_Alloc& _Al;
};
template <class _Ty, class _Alloc>
void _Reverse_destroy_multidimensional_n_al(_Ty* const _Arr, size_t _Size, _Alloc& _Al) noexcept {
while (_Size > 0) {
--_Size;
if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_al(_Arr[_Size], extent_v<_Ty>, _Al);
} else {
allocator_traits<_Alloc>::destroy(_Al, _Arr + _Size);
}
}
}
template <class _Ty, class _Alloc>
struct _NODISCARD _Reverse_destroy_multidimensional_n_al_guard {
_Ty* _Target;
size_t _Index;
_Alloc& _Al;
~_Reverse_destroy_multidimensional_n_al_guard() {
if (_Target) {
_Reverse_destroy_multidimensional_n_al(_Target, _Index, _Al);
}
}
};
template <class _Ty, size_t _Size, class _Alloc>
void _Uninitialized_copy_multidimensional_al(const _Ty (&_In)[_Size], _Ty (&_Out)[_Size], _Alloc& _Al) {
using _Item = remove_all_extents_t<_Ty>;
if constexpr (conjunction_v<is_trivial<_Ty>, _Uses_default_construct<_Alloc, _Item*, const _Item&>>) {
_Copy_memmove(_In, _In + _Size, _Out);
} else if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_al_guard<_Ty, _Alloc> _Guard{_Out, 0, _Al};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_copy_multidimensional_al(_In[_Idx], _Out[_Idx], _Al);
}
_Guard._Target = nullptr;
} else {
_Uninitialized_rev_destroying_backout_al _Backout{_Out, _Al};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back(_In[_Idx]);
}
_Backout._Release();
}
}
template <class _Ty, class _Alloc>
void _Uninitialized_value_construct_multidimensional_n_al(_Ty* const _Out, const size_t _Size, _Alloc& _Al) {
using _Item = remove_all_extents_t<_Ty>;
if constexpr (_Use_memset_value_construct_v<_Item*> && _Uses_default_construct<_Alloc, _Item*>::value) {
_Zero_range(_Out, _Out + _Size);
} else if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_al_guard<_Ty, _Alloc> _Guard{_Out, 0, _Al};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_value_construct_multidimensional_n_al(_Out[_Idx], extent_v<_Ty>, _Al);
}
_Guard._Target = nullptr;
} else {
_Uninitialized_rev_destroying_backout_al _Backout{_Out, _Al};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back();
}
_Backout._Release();
}
}
template <class _Ty, class _Alloc>
void _Uninitialized_fill_multidimensional_n_al(_Ty* const _Out, const size_t _Size, const _Ty& _Val, _Alloc& _Al) {
if constexpr (is_array_v<_Ty>) {
_Reverse_destroy_multidimensional_n_al_guard<_Ty, _Alloc> _Guard{_Out, 0, _Al};
for (size_t& _Idx = _Guard._Index; _Idx < _Size; ++_Idx) {
_Uninitialized_copy_multidimensional_al(_Val, _Out[_Idx], _Al); // intentionally copy, not fill
}
_Guard._Target = nullptr;
} else if constexpr (_Fill_memset_is_safe<_Ty*, _Ty> && _Uses_default_construct<_Alloc, _Ty*, const _Ty&>::value) {
_Fill_memset(_Out, _Val, _Size);
} else {
if constexpr (_Fill_zero_memset_is_safe<_Ty*,
_Ty> && _Uses_default_construct<_Alloc, _Ty*, const _Ty&>::value) {
if (_Is_all_bits_zero(_Val)) {
_Fill_zero_memset(_Out, _Size);
return;
}
}
_Uninitialized_rev_destroying_backout_al _Backout{_Out, _Al};
for (size_t _Idx = 0; _Idx < _Size; ++_Idx) {
_Backout._Emplace_back(_Val);
}
_Backout._Release();
}
}
// CLASS TEMPLATE _Ref_count_unbounded_array_alloc
template <class _Ty, class _Alloc>
class _Ref_count_unbounded_array_alloc : public _Ebco_base<_Rebind_alloc_t<_Alloc, remove_all_extents_t<_Ty>>>,
public _Ref_count_base {
// handle reference counting for unbounded array in control block, allocator
private:
static_assert(is_unbounded_array_v<_Ty>);
static_assert(is_same_v<_Ty, remove_cv_t<_Ty>>, "allocate_shared should remove_cv_t");
using _Item = remove_all_extents_t<_Ty>;
using _Rebound = _Rebind_alloc_t<_Alloc, _Item>;
public:
using _Element_type = remove_extent_t<_Ty>;
explicit _Ref_count_unbounded_array_alloc(const _Alloc& _Al_arg, const size_t _Count)
: _Ebco_base<_Rebound>(_Al_arg), _Ref_count_base(), _Size(_Count) {
_Uninitialized_value_construct_multidimensional_n_al(_Get_ptr(), _Size, this->_Get_val());
}
template <class _Arg>
explicit _Ref_count_unbounded_array_alloc(const _Alloc& _Al_arg, const size_t _Count, const _Arg& _Val)
: _Ebco_base<_Rebound>(_Al_arg), _Ref_count_base(), _Size(_Count) {
if constexpr (is_same_v<_For_overwrite_tag, _Arg>) {
_Uninitialized_default_construct_multidimensional_n(_Get_ptr(), _Size); // the allocator isn't needed
} else {
_Uninitialized_fill_multidimensional_n_al(_Get_ptr(), _Size, _Val, this->_Get_val());
}
}
_NODISCARD auto _Get_ptr() noexcept {
return _STD addressof(_Storage._Value);
}
private:
size_t _Size;
union {
_Wrap<_Element_type> _Storage; // flexible array must be last member
};
virtual ~_Ref_count_unbounded_array_alloc() noexcept override { // TRANSITION, should be non-virtual
// nothing to do; _Storage._Value already destroyed by _Destroy()
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
if constexpr (!conjunction_v<is_trivially_destructible<_Item>, _Uses_default_destroy<_Rebound, _Item*>>) {
_Reverse_destroy_multidimensional_n_al(_Get_ptr(), _Size, this->_Get_val());
}
}
virtual void _Delete_this() noexcept override { // destroy self
constexpr size_t _Align = alignof(_Ref_count_unbounded_array_alloc);
using _Storage = _Alignas_storage_unit<_Align>;
_Rebind_alloc_t<_Alloc, _Storage> _Al(this->_Get_val());
const size_t _Bytes =
_Calculate_bytes_for_flexible_array<_Ref_count_unbounded_array_alloc, _Check_overflow::_Nope>(_Size);
const size_t _Storage_units = _Bytes / sizeof(_Storage);
this->~_Ref_count_unbounded_array_alloc();
_Al.deallocate(reinterpret_cast<_Storage*>(this), _Storage_units);
}
};
// CLASS TEMPLATE _Ref_count_bounded_array_alloc
template <class _Ty, class _Alloc>
class _Ref_count_bounded_array_alloc : public _Ebco_base<_Rebind_alloc_t<_Alloc, remove_all_extents_t<_Ty>>>,
public _Ref_count_base {
// handle reference counting for bounded array in control block, allocator
private:
static_assert(is_bounded_array_v<_Ty>);
static_assert(is_same_v<_Ty, remove_cv_t<_Ty>>, "allocate_shared should remove_cv_t");
using _Item = remove_all_extents_t<_Ty>;
using _Rebound = _Rebind_alloc_t<_Alloc, _Item>;
public:
explicit _Ref_count_bounded_array_alloc(const _Alloc& _Al_arg)
: _Ebco_base<_Rebound>(_Al_arg), _Ref_count_base() { // don't value-initialize _Storage
_Uninitialized_value_construct_multidimensional_n_al(_Storage._Value, extent_v<_Ty>, this->_Get_val());
}
template <class _Arg>
explicit _Ref_count_bounded_array_alloc(const _Alloc& _Al_arg, const _Arg& _Val)
: _Ebco_base<_Rebound>(_Al_arg), _Ref_count_base() { // don't value-initialize _Storage
if constexpr (is_same_v<_For_overwrite_tag, _Arg>) {
_Uninitialized_default_construct_multidimensional_n(
_Storage._Value, extent_v<_Ty>); // the allocator isn't needed
} else {
_Uninitialized_fill_multidimensional_n_al(_Storage._Value, extent_v<_Ty>, _Val, this->_Get_val());
}
}
union {
_Wrap<_Ty> _Storage;
};
private:
virtual ~_Ref_count_bounded_array_alloc() noexcept override { // TRANSITION, should be non-virtual
// nothing to do; _Storage._Value already destroyed by _Destroy()
// See N4849 [class.dtor]/7.
}
virtual void _Destroy() noexcept override { // destroy managed resource
if constexpr (!conjunction_v<is_trivially_destructible<_Item>, _Uses_default_destroy<_Rebound, _Item*>>) {
_Reverse_destroy_multidimensional_n_al(_Storage._Value, extent_v<_Ty>, this->_Get_val());
}
}
virtual void _Delete_this() noexcept override { // destroy self
_Rebind_alloc_t<_Alloc, _Ref_count_bounded_array_alloc> _Al(this->_Get_val());
this->~_Ref_count_bounded_array_alloc();
_Deallocate_plain(_Al, this);
}
};
#endif // _HAS_CXX20
// FUNCTION TEMPLATE make_shared
template <class _Ty, class... _Types>
_NODISCARD
#if _HAS_CXX20
enable_if_t<!is_array_v<_Ty>, shared_ptr<_Ty>>
#else // _HAS_CXX20
shared_ptr<_Ty>
#endif // _HAS_CXX20
make_shared(_Types&&... _Args) { // make a shared_ptr to non-array object
const auto _Rx = new _Ref_count_obj2<_Ty>(_STD forward<_Types>(_Args)...);
shared_ptr<_Ty> _Ret;
_Ret._Set_ptr_rep_and_enable_shared(_STD addressof(_Rx->_Storage._Value), _Rx);
return _Ret;
}
#if _HAS_CXX20
template <class _Refc>
struct _NODISCARD _Global_delete_guard {
_Refc* _Target;
~_Global_delete_guard() {
// While this branch is technically unnecessary because N4849 [new.delete.single]/17 requires
// `::operator delete(nullptr)` to be a no-op, it's here to help optimizers see that after
// `_Guard._Target = nullptr;`, this destructor can be eliminated.
if (_Target) {
_Deallocate_flexible_array(_Target);
}
}
};
template <class _Ty, class... _ArgTypes>
_NODISCARD shared_ptr<_Ty> _Make_shared_unbounded_array(const size_t _Count, const _ArgTypes&... _Args) {
// make a shared_ptr to an unbounded array
static_assert(is_unbounded_array_v<_Ty>);
using _Refc = _Ref_count_unbounded_array<_Ty>;
const auto _Rx = _Allocate_flexible_array<_Refc>(_Count);
_Global_delete_guard<_Refc> _Guard{_Rx};
::new (static_cast<void*>(_Rx)) _Refc(_Count, _Args...);
_Guard._Target = nullptr;
shared_ptr<_Ty> _Ret;
_Ret._Set_ptr_rep_and_enable_shared(_Rx->_Get_ptr(), _Rx);
return _Ret;
}
template <class _Ty>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared(const size_t _Count) {
return _Make_shared_unbounded_array<_Ty>(_Count);
}
template <class _Ty>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared(
const size_t _Count, const remove_extent_t<_Ty>& _Val) {
return _Make_shared_unbounded_array<_Ty>(_Count, _Val);
}
template <class _Ty>
_NODISCARD enable_if_t<is_bounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared() {
// make a shared_ptr to a bounded array
const auto _Rx = new _Ref_count_bounded_array<_Ty>();
shared_ptr<_Ty> _Ret;
_Ret._Set_ptr_rep_and_enable_shared(_Rx->_Storage._Value, _Rx);
return _Ret;
}
template <class _Ty>
_NODISCARD enable_if_t<is_bounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared(const remove_extent_t<_Ty>& _Val) {
// make a shared_ptr to a bounded array
const auto _Rx = new _Ref_count_bounded_array<_Ty>(_Val);
shared_ptr<_Ty> _Ret;
_Ret._Set_ptr_rep_and_enable_shared(_Rx->_Storage._Value, _Rx);
return _Ret;
}
// FUNCTION TEMPLATE make_shared_for_overwrite
template <class _Ty>
_NODISCARD enable_if_t<!is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared_for_overwrite() {
shared_ptr<_Ty> _Ret;
if constexpr (is_array_v<_Ty>) {
// make a shared_ptr to a bounded array
const auto _Rx = new _Ref_count_bounded_array<_Ty>(_For_overwrite_tag{});
_Ret._Set_ptr_rep_and_enable_shared(_Rx->_Storage._Value, _Rx);
} else {
// make a shared_ptr to non-array object
const auto _Rx = new _Ref_count_obj2<_Ty>(_For_overwrite_tag{});
_Ret._Set_ptr_rep_and_enable_shared(_STD addressof(_Rx->_Storage._Value), _Rx);
}
return _Ret;
}
template <class _Ty>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> make_shared_for_overwrite(const size_t _Count) {
return _Make_shared_unbounded_array<_Ty>(_Count, _For_overwrite_tag{});
}
#endif // _HAS_CXX20
// FUNCTION TEMPLATE allocate_shared
template <class _Ty, class _Alloc, class... _Types>
_NODISCARD
#if _HAS_CXX20
enable_if_t<!is_array_v<_Ty>, shared_ptr<_Ty>>
#else // _HAS_CXX20
shared_ptr<_Ty>
#endif // _HAS_CXX20
allocate_shared(const _Alloc& _Al, _Types&&... _Args) { // make a shared_ptr to non-array object
// Note: As of 2019-05-28, this implements the proposed resolution of LWG-3210 (which controls whether
// allocator::construct sees T or const T when _Ty is const qualified)
using _Refoa = _Ref_count_obj_alloc3<remove_cv_t<_Ty>, _Alloc>;
using _Alblock = _Rebind_alloc_t<_Alloc, _Refoa>;
_Alblock _Rebound(_Al);
_Alloc_construct_ptr<_Alblock> _Constructor{_Rebound};
_Constructor._Allocate();
_Construct_in_place(*_Constructor._Ptr, _Al, _STD forward<_Types>(_Args)...);
shared_ptr<_Ty> _Ret;
const auto _Ptr = reinterpret_cast<_Ty*>(_STD addressof(_Constructor._Ptr->_Storage._Value));
_Ret._Set_ptr_rep_and_enable_shared(_Ptr, _Unfancy(_Constructor._Release()));
return _Ret;
}
#if _HAS_CXX20
template <class _Alloc>
struct _Allocate_n_ptr {
_Alloc& _Al;
_Alloc_ptr_t<_Alloc> _Ptr;
size_t _Nx;
_Allocate_n_ptr(_Alloc& _Al_, const size_t _Nx_) : _Al(_Al_), _Ptr(_Al_.allocate(_Nx_)), _Nx(_Nx_) {}
~_Allocate_n_ptr() {
if (_Ptr) {
_Al.deallocate(_Ptr, _Nx);
}
}
_Allocate_n_ptr(const _Allocate_n_ptr&) = delete;
_Allocate_n_ptr& operator=(const _Allocate_n_ptr&) = delete;
};
template <class _Ty, class _Alloc, class... _ArgTypes>
_NODISCARD shared_ptr<_Ty> _Allocate_shared_unbounded_array(
const _Alloc& _Al, const size_t _Count, const _ArgTypes&... _Args) {
// make a shared_ptr to an unbounded array
static_assert(is_unbounded_array_v<_Ty>);
using _Refc = _Ref_count_unbounded_array_alloc<remove_cv_t<_Ty>, _Alloc>;
constexpr size_t _Align = alignof(_Refc);
using _Storage = _Alignas_storage_unit<_Align>;
_Rebind_alloc_t<_Alloc, _Storage> _Rebound(_Al);
const size_t _Bytes = _Calculate_bytes_for_flexible_array<_Refc, _Check_overflow::_Yes>(_Count);
const size_t _Storage_units = _Bytes / sizeof(_Storage);
_Allocate_n_ptr _Guard{_Rebound, _Storage_units};
const auto _Rx = reinterpret_cast<_Refc*>(_Unfancy(_Guard._Ptr));
::new (static_cast<void*>(_Rx)) _Refc(_Al, _Count, _Args...);
_Guard._Ptr = nullptr;
shared_ptr<_Ty> _Ret;
_Ret._Set_ptr_rep_and_enable_shared(_Rx->_Get_ptr(), _Rx);
return _Ret;
}
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared(
const _Alloc& _Al, const size_t _Count) {
return _Allocate_shared_unbounded_array<_Ty>(_Al, _Count);
}
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared(
const _Alloc& _Al, const size_t _Count, const remove_extent_t<_Ty>& _Val) {
return _Allocate_shared_unbounded_array<_Ty>(_Al, _Count, _Val);
}
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<is_bounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared(const _Alloc& _Al) {
// make a shared_ptr to a bounded array
using _Refc = _Ref_count_bounded_array_alloc<remove_cv_t<_Ty>, _Alloc>;
using _Alblock = _Rebind_alloc_t<_Alloc, _Refc>;
_Alblock _Rebound(_Al);
_Alloc_construct_ptr _Constructor{_Rebound};
_Constructor._Allocate();
::new (_Voidify_iter(_Constructor._Ptr)) _Refc(_Al);
shared_ptr<_Ty> _Ret;
const auto _Ptr = static_cast<remove_extent_t<_Ty>*>(_Constructor._Ptr->_Storage._Value);
_Ret._Set_ptr_rep_and_enable_shared(_Ptr, _Unfancy(_Constructor._Release()));
return _Ret;
}
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<is_bounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared(
const _Alloc& _Al, const remove_extent_t<_Ty>& _Val) {
// make a shared_ptr to a bounded array
using _Refc = _Ref_count_bounded_array_alloc<remove_cv_t<_Ty>, _Alloc>;
using _Alblock = _Rebind_alloc_t<_Alloc, _Refc>;
_Alblock _Rebound(_Al);
_Alloc_construct_ptr _Constructor{_Rebound};
_Constructor._Allocate();
::new (_Voidify_iter(_Constructor._Ptr)) _Refc(_Al, _Val);
shared_ptr<_Ty> _Ret;
const auto _Ptr = static_cast<remove_extent_t<_Ty>*>(_Constructor._Ptr->_Storage._Value);
_Ret._Set_ptr_rep_and_enable_shared(_Ptr, _Unfancy(_Constructor._Release()));
return _Ret;
}
// FUNCTION TEMPLATE allocate_shared_for_overwrite
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<!is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared_for_overwrite(const _Alloc& _Al) {
shared_ptr<_Ty> _Ret;
if constexpr (is_array_v<_Ty>) {
// make a shared_ptr to a bounded array
using _Refc = _Ref_count_bounded_array_alloc<remove_cv_t<_Ty>, _Alloc>;
using _Alblock = _Rebind_alloc_t<_Alloc, _Refc>;
_Alblock _Rebound(_Al);
_Alloc_construct_ptr _Constructor{_Rebound};
_Constructor._Allocate();
::new (_Voidify_iter(_Constructor._Ptr)) _Refc(_Al, _For_overwrite_tag{});
const auto _Ptr = static_cast<remove_extent_t<_Ty>*>(_Constructor._Ptr->_Storage._Value);
_Ret._Set_ptr_rep_and_enable_shared(_Ptr, _Unfancy(_Constructor._Release()));
} else {
// make a shared_ptr to non-array object
using _Refoa = _Ref_count_obj_alloc3<remove_cv_t<_Ty>, _Alloc>;
using _Alblock = _Rebind_alloc_t<_Alloc, _Refoa>;
_Alblock _Rebound(_Al);
_Alloc_construct_ptr<_Alblock> _Constructor{_Rebound};
_Constructor._Allocate();
_Construct_in_place(*_Constructor._Ptr, _Al, _For_overwrite_tag{});
const auto _Ptr = reinterpret_cast<_Ty*>(_STD addressof(_Constructor._Ptr->_Storage._Value));
_Ret._Set_ptr_rep_and_enable_shared(_Ptr, _Unfancy(_Constructor._Release()));
}
return _Ret;
}
template <class _Ty, class _Alloc>
_NODISCARD enable_if_t<is_unbounded_array_v<_Ty>, shared_ptr<_Ty>> allocate_shared_for_overwrite(
const _Alloc& _Al, const size_t _Count) {
return _Allocate_shared_unbounded_array<_Ty>(_Al, _Count, _For_overwrite_tag{});
}
#endif // _HAS_CXX20
// CLASS TEMPLATE weak_ptr
template <class _Ty>
class weak_ptr : public _Ptr_base<_Ty> { // class for pointer to reference counted resource
public:
constexpr weak_ptr() noexcept {}
weak_ptr(const weak_ptr& _Other) noexcept {
this->_Weakly_construct_from(_Other); // same type, no conversion
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
weak_ptr(const shared_ptr<_Ty2>& _Other) noexcept {
this->_Weakly_construct_from(_Other); // shared_ptr keeps resource alive during conversion
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
weak_ptr(const weak_ptr<_Ty2>& _Other) noexcept {
this->_Weakly_convert_lvalue_avoiding_expired_conversions(_Other);
}
weak_ptr(weak_ptr&& _Other) noexcept {
this->_Move_construct_from(_STD move(_Other));
}
template <class _Ty2, enable_if_t<_SP_pointer_compatible<_Ty2, _Ty>::value, int> = 0>
weak_ptr(weak_ptr<_Ty2>&& _Other) noexcept {
this->_Weakly_convert_rvalue_avoiding_expired_conversions(_STD move(_Other));
}
~weak_ptr() noexcept {
this->_Decwref();
}
weak_ptr& operator=(const weak_ptr& _Right) noexcept {
weak_ptr(_Right).swap(*this);
return *this;
}
template <class _Ty2>
weak_ptr& operator=(const weak_ptr<_Ty2>& _Right) noexcept {
weak_ptr(_Right).swap(*this);
return *this;
}
weak_ptr& operator=(weak_ptr&& _Right) noexcept {
weak_ptr(_STD move(_Right)).swap(*this);
return *this;
}
template <class _Ty2>
weak_ptr& operator=(weak_ptr<_Ty2>&& _Right) noexcept {
weak_ptr(_STD move(_Right)).swap(*this);
return *this;
}
template <class _Ty2>
weak_ptr& operator=(const shared_ptr<_Ty2>& _Right) noexcept {
weak_ptr(_Right).swap(*this);
return *this;
}
void reset() noexcept { // release resource, convert to null weak_ptr object
weak_ptr{}.swap(*this);
}
void swap(weak_ptr& _Other) noexcept {
this->_Swap(_Other);
}
_NODISCARD bool expired() const noexcept {
return this->use_count() == 0;
}
_NODISCARD shared_ptr<_Ty> lock() const noexcept { // convert to shared_ptr
shared_ptr<_Ty> _Ret;
(void) _Ret._Construct_from_weak(*this);
return _Ret;
}
};
#if _HAS_CXX17
template <class _Ty>
weak_ptr(shared_ptr<_Ty>) -> weak_ptr<_Ty>;
#endif // _HAS_CXX17
template <class _Ty>
void swap(weak_ptr<_Ty>& _Left, weak_ptr<_Ty>& _Right) noexcept {
_Left.swap(_Right);
}
// CLASS TEMPLATE enable_shared_from_this
template <class _Ty>
class enable_shared_from_this { // provide member functions that create shared_ptr to this
public:
using _Esft_type = enable_shared_from_this;
_NODISCARD shared_ptr<_Ty> shared_from_this() {
return shared_ptr<_Ty>(_Wptr);
}
_NODISCARD shared_ptr<const _Ty> shared_from_this() const {
return shared_ptr<const _Ty>(_Wptr);
}
_NODISCARD weak_ptr<_Ty> weak_from_this() noexcept {
return _Wptr;
}
_NODISCARD weak_ptr<const _Ty> weak_from_this() const noexcept {
return _Wptr;
}
protected:
constexpr enable_shared_from_this() noexcept : _Wptr() {}
enable_shared_from_this(const enable_shared_from_this&) noexcept : _Wptr() {
// construct (must value-initialize _Wptr)
}
enable_shared_from_this& operator=(const enable_shared_from_this&) noexcept { // assign (must not change _Wptr)
return *this;
}
~enable_shared_from_this() = default;
private:
template <class _Yty>
friend class shared_ptr;
mutable weak_ptr<_Ty> _Wptr;
};
// CLASS TEMPLATE unique_ptr AND HELPERS
// STRUCT TEMPLATE default_delete
template <class _Ty>
struct default_delete { // default deleter for unique_ptr
constexpr default_delete() noexcept = default;
template <class _Ty2, enable_if_t<is_convertible_v<_Ty2*, _Ty*>, int> = 0>
default_delete(const default_delete<_Ty2>&) noexcept {}
void operator()(_Ty* _Ptr) const noexcept /* strengthened */ { // delete a pointer
static_assert(0 < sizeof(_Ty), "can't delete an incomplete type");
delete _Ptr;
}
};
template <class _Ty>
struct default_delete<_Ty[]> { // default deleter for unique_ptr to array of unknown size
constexpr default_delete() noexcept = default;
template <class _Uty, enable_if_t<is_convertible_v<_Uty (*)[], _Ty (*)[]>, int> = 0>
default_delete(const default_delete<_Uty[]>&) noexcept {}
template <class _Uty, enable_if_t<is_convertible_v<_Uty (*)[], _Ty (*)[]>, int> = 0>
void operator()(_Uty* _Ptr) const noexcept /* strengthened */ { // delete a pointer
static_assert(0 < sizeof(_Uty), "can't delete an incomplete type");
delete[] _Ptr;
}
};
// STRUCT TEMPLATE _Get_deleter_pointer_type
template <class _Ty, class _Dx_noref, class = void>
struct _Get_deleter_pointer_type { // provide fallback
using type = _Ty*;
};
template <class _Ty, class _Dx_noref>
struct _Get_deleter_pointer_type<_Ty, _Dx_noref, void_t<typename _Dx_noref::pointer>> { // get _Dx_noref::pointer
using type = typename _Dx_noref::pointer;
};
template <class _Dx2>
using _Unique_ptr_enable_default_t =
enable_if_t<conjunction_v<negation<is_pointer<_Dx2>>, is_default_constructible<_Dx2>>, int>;
// CLASS TEMPLATE unique_ptr SCALAR
template <class _Ty, class _Dx /* = default_delete<_Ty> */>
class unique_ptr { // non-copyable pointer to an object
public:
using pointer = typename _Get_deleter_pointer_type<_Ty, remove_reference_t<_Dx>>::type;
using element_type = _Ty;
using deleter_type = _Dx;
template <class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0>
constexpr unique_ptr() noexcept : _Mypair(_Zero_then_variadic_args_t{}) {}
template <class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0>
constexpr unique_ptr(nullptr_t) noexcept : _Mypair(_Zero_then_variadic_args_t{}) {}
unique_ptr& operator=(nullptr_t) noexcept {
reset();
return *this;
}
template <class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0>
explicit unique_ptr(pointer _Ptr) noexcept : _Mypair(_Zero_then_variadic_args_t{}, _Ptr) {}
template <class _Dx2 = _Dx, enable_if_t<is_constructible_v<_Dx2, const _Dx2&>, int> = 0>
unique_ptr(pointer _Ptr, const _Dx& _Dt) noexcept : _Mypair(_One_then_variadic_args_t{}, _Dt, _Ptr) {}
template <class _Dx2 = _Dx,
enable_if_t<conjunction_v<negation<is_reference<_Dx2>>, is_constructible<_Dx2, _Dx2>>, int> = 0>
unique_ptr(pointer _Ptr, _Dx&& _Dt) noexcept : _Mypair(_One_then_variadic_args_t{}, _STD move(_Dt), _Ptr) {}
template <class _Dx2 = _Dx,
enable_if_t<conjunction_v<is_reference<_Dx2>, is_constructible<_Dx2, remove_reference_t<_Dx2>>>, int> = 0>
unique_ptr(pointer, remove_reference_t<_Dx>&&) = delete;
template <class _Dx2 = _Dx, enable_if_t<is_move_constructible_v<_Dx2>, int> = 0>
unique_ptr(unique_ptr&& _Right) noexcept
: _Mypair(_One_then_variadic_args_t{}, _STD forward<_Dx>(_Right.get_deleter()), _Right.release()) {}
template <class _Ty2, class _Dx2,
enable_if_t<
conjunction_v<negation<is_array<_Ty2>>, is_convertible<typename unique_ptr<_Ty2, _Dx2>::pointer, pointer>,
conditional_t<is_reference_v<_Dx>, is_same<_Dx2, _Dx>, is_convertible<_Dx2, _Dx>>>,
int> = 0>
unique_ptr(unique_ptr<_Ty2, _Dx2>&& _Right) noexcept
: _Mypair(_One_then_variadic_args_t{}, _STD forward<_Dx2>(_Right.get_deleter()), _Right.release()) {}
#if _HAS_AUTO_PTR_ETC
template <class _Ty2,
enable_if_t<conjunction_v<is_convertible<_Ty2*, _Ty*>, is_same<_Dx, default_delete<_Ty>>>, int> = 0>
unique_ptr(auto_ptr<_Ty2>&& _Right) noexcept : _Mypair(_Zero_then_variadic_args_t{}, _Right.release()) {}
#endif // _HAS_AUTO_PTR_ETC
template <class _Ty2, class _Dx2,
enable_if_t<conjunction_v<negation<is_array<_Ty2>>, is_assignable<_Dx&, _Dx2>,
is_convertible<typename unique_ptr<_Ty2, _Dx2>::pointer, pointer>>,
int> = 0>
unique_ptr& operator=(unique_ptr<_Ty2, _Dx2>&& _Right) noexcept {
reset(_Right.release());
_Mypair._Get_first() = _STD forward<_Dx2>(_Right._Mypair._Get_first());
return *this;
}
template <class _Dx2 = _Dx, enable_if_t<is_move_assignable_v<_Dx2>, int> = 0>
unique_ptr& operator=(unique_ptr&& _Right) noexcept {
if (this != _STD addressof(_Right)) {
reset(_Right.release());
_Mypair._Get_first() = _STD forward<_Dx>(_Right._Mypair._Get_first());
}
return *this;
}
void swap(unique_ptr& _Right) noexcept {
_Swap_adl(_Mypair._Myval2, _Right._Mypair._Myval2);
_Swap_adl(_Mypair._Get_first(), _Right._Mypair._Get_first());
}
~unique_ptr() noexcept {
if (_Mypair._Myval2) {
_Mypair._Get_first()(_Mypair._Myval2);
}
}
_NODISCARD _Dx& get_deleter() noexcept {
return _Mypair._Get_first();
}
_NODISCARD const _Dx& get_deleter() const noexcept {
return _Mypair._Get_first();
}
_NODISCARD add_lvalue_reference_t<_Ty> operator*() const noexcept /* strengthened */ {
return *_Mypair._Myval2;
}
_NODISCARD pointer operator->() const noexcept {
return _Mypair._Myval2;
}
_NODISCARD pointer get() const noexcept {
return _Mypair._Myval2;
}
explicit operator bool() const noexcept {
return static_cast<bool>(_Mypair._Myval2);
}
pointer release() noexcept {
return _STD exchange(_Mypair._Myval2, nullptr);
}
void reset(pointer _Ptr = nullptr) noexcept {
pointer _Old = _STD exchange(_Mypair._Myval2, _Ptr);
if (_Old) {
_Mypair._Get_first()(_Old);
}
}
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
private:
template <class, class>
friend class unique_ptr;
_Compressed_pair<_Dx, pointer> _Mypair;
};
// CLASS TEMPLATE unique_ptr ARRAY
template <class _Ty, class _Dx>
class unique_ptr<_Ty[], _Dx> { // non-copyable pointer to an array object
public:
using pointer = typename _Get_deleter_pointer_type<_Ty, remove_reference_t<_Dx>>::type;
using element_type = _Ty;
using deleter_type = _Dx;
template <class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0>
constexpr unique_ptr() noexcept : _Mypair(_Zero_then_variadic_args_t{}) {}
template <class _Uty, class _Is_nullptr = is_same<_Uty, nullptr_t>>
using _Enable_ctor_reset =
enable_if_t<is_same_v<_Uty, pointer> //
|| _Is_nullptr::value //
|| (is_same_v<pointer, element_type*> //
&& is_pointer_v<_Uty> //
&& is_convertible_v<remove_pointer_t<_Uty> (*)[], element_type (*)[]>)>; // TRANSITION, GH-248
template <class _Uty, class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0, class = _Enable_ctor_reset<_Uty>>
explicit unique_ptr(_Uty _Ptr) noexcept : _Mypair(_Zero_then_variadic_args_t{}, _Ptr) {}
template <class _Uty, class _Dx2 = _Dx, enable_if_t<is_constructible_v<_Dx2, const _Dx2&>, int> = 0,
class = _Enable_ctor_reset<_Uty>>
unique_ptr(_Uty _Ptr, const _Dx& _Dt) noexcept : _Mypair(_One_then_variadic_args_t{}, _Dt, _Ptr) {}
template <class _Uty, class _Dx2 = _Dx,
enable_if_t<conjunction_v<negation<is_reference<_Dx2>>, is_constructible<_Dx2, _Dx2>>, int> = 0,
class = _Enable_ctor_reset<_Uty>>
unique_ptr(_Uty _Ptr, _Dx&& _Dt) noexcept : _Mypair(_One_then_variadic_args_t{}, _STD move(_Dt), _Ptr) {}
template <class _Uty, class _Dx2 = _Dx,
enable_if_t<conjunction_v<is_reference<_Dx2>, is_constructible<_Dx2, remove_reference_t<_Dx2>>>, int> = 0>
unique_ptr(_Uty, remove_reference_t<_Dx>&&) = delete;
template <class _Dx2 = _Dx, enable_if_t<is_move_constructible_v<_Dx2>, int> = 0>
unique_ptr(unique_ptr&& _Right) noexcept
: _Mypair(_One_then_variadic_args_t{}, _STD forward<_Dx>(_Right.get_deleter()), _Right.release()) {}
template <class _Dx2 = _Dx, enable_if_t<is_move_assignable_v<_Dx2>, int> = 0>
unique_ptr& operator=(unique_ptr&& _Right) noexcept {
if (this != _STD addressof(_Right)) {
reset(_Right.release());
_Mypair._Get_first() = _STD move(_Right._Mypair._Get_first());
}
return *this;
}
template <class _Uty, class _Ex, class _More, class _UP_pointer = typename unique_ptr<_Uty, _Ex>::pointer,
class _UP_element_type = typename unique_ptr<_Uty, _Ex>::element_type>
using _Enable_conversion = enable_if_t<
conjunction_v<is_array<_Uty>, is_same<pointer, element_type*>, is_same<_UP_pointer, _UP_element_type*>,
is_convertible<_UP_element_type (*)[], element_type (*)[]>, _More>>; // TRANSITION, GH-248
template <class _Uty, class _Ex,
class = _Enable_conversion<_Uty, _Ex,
conditional_t<is_reference_v<_Dx>, is_same<_Ex, _Dx>, is_convertible<_Ex, _Dx>>>>
unique_ptr(unique_ptr<_Uty, _Ex>&& _Right) noexcept
: _Mypair(_One_then_variadic_args_t{}, _STD forward<_Ex>(_Right.get_deleter()), _Right.release()) {}
template <class _Uty, class _Ex, class = _Enable_conversion<_Uty, _Ex, is_assignable<_Dx&, _Ex>>>
unique_ptr& operator=(unique_ptr<_Uty, _Ex>&& _Right) noexcept {
reset(_Right.release());
_Mypair._Get_first() = _STD forward<_Ex>(_Right._Mypair._Get_first());
return *this;
}
template <class _Dx2 = _Dx, _Unique_ptr_enable_default_t<_Dx2> = 0>
constexpr unique_ptr(nullptr_t) noexcept : _Mypair(_Zero_then_variadic_args_t{}) {}
unique_ptr& operator=(nullptr_t) noexcept {
reset();
return *this;
}
void reset(nullptr_t = nullptr) noexcept {
reset(pointer());
}
void swap(unique_ptr& _Right) noexcept {
_Swap_adl(_Mypair._Myval2, _Right._Mypair._Myval2);
_Swap_adl(_Mypair._Get_first(), _Right._Mypair._Get_first());
}
~unique_ptr() noexcept {
if (_Mypair._Myval2) {
_Mypair._Get_first()(_Mypair._Myval2);
}
}
_NODISCARD _Dx& get_deleter() noexcept {
return _Mypair._Get_first();
}
_NODISCARD const _Dx& get_deleter() const noexcept {
return _Mypair._Get_first();
}
_NODISCARD _Ty& operator[](size_t _Idx) const noexcept /* strengthened */ {
return _Mypair._Myval2[_Idx];
}
_NODISCARD pointer get() const noexcept {
return _Mypair._Myval2;
}
explicit operator bool() const noexcept {
return static_cast<bool>(_Mypair._Myval2);
}
pointer release() noexcept {
return _STD exchange(_Mypair._Myval2, nullptr);
}
template <class _Uty, class = _Enable_ctor_reset<_Uty, false_type>>
void reset(_Uty _Ptr) noexcept {
pointer _Old = _STD exchange(_Mypair._Myval2, _Ptr);
if (_Old) {
_Mypair._Get_first()(_Old);
}
}
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
private:
template <class, class>
friend class unique_ptr;
_Compressed_pair<_Dx, pointer> _Mypair;
};
// FUNCTION TEMPLATE make_unique
template <class _Ty, class... _Types, enable_if_t<!is_array_v<_Ty>, int> = 0>
_NODISCARD unique_ptr<_Ty> make_unique(_Types&&... _Args) { // make a unique_ptr
return unique_ptr<_Ty>(new _Ty(_STD forward<_Types>(_Args)...));
}
template <class _Ty, enable_if_t<is_array_v<_Ty> && extent_v<_Ty> == 0, int> = 0>
_NODISCARD unique_ptr<_Ty> make_unique(const size_t _Size) { // make a unique_ptr
using _Elem = remove_extent_t<_Ty>;
return unique_ptr<_Ty>(new _Elem[_Size]());
}
template <class _Ty, class... _Types, enable_if_t<extent_v<_Ty> != 0, int> = 0>
void make_unique(_Types&&...) = delete;
#if _HAS_CXX20
// FUNCTION TEMPLATE make_unique_for_overwrite
template <class _Ty, enable_if_t<!is_array_v<_Ty>, int> = 0>
_NODISCARD unique_ptr<_Ty> make_unique_for_overwrite() { // make a unique_ptr with default initialization
return unique_ptr<_Ty>(new _Ty);
}
template <class _Ty, enable_if_t<is_unbounded_array_v<_Ty>, int> = 0>
_NODISCARD unique_ptr<_Ty> make_unique_for_overwrite(
const size_t _Size) { // make a unique_ptr with default initialization
using _Elem = remove_extent_t<_Ty>;
return unique_ptr<_Ty>(new _Elem[_Size]);
}
template <class _Ty, class... _Types, enable_if_t<is_bounded_array_v<_Ty>, int> = 0>
void make_unique_for_overwrite(_Types&&...) = delete;
#endif // _HAS_CXX20
template <class _Ty, class _Dx, enable_if_t<_Is_swappable<_Dx>::value, int> = 0>
void swap(unique_ptr<_Ty, _Dx>& _Left, unique_ptr<_Ty, _Dx>& _Right) noexcept {
_Left.swap(_Right);
}
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator==(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
return _Left.get() == _Right.get();
}
#if !_HAS_CXX20
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator!=(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
return !(_Left == _Right);
}
#endif // !_HAS_CXX20
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator<(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
using _Ptr1 = typename unique_ptr<_Ty1, _Dx1>::pointer;
using _Ptr2 = typename unique_ptr<_Ty2, _Dx2>::pointer;
using _Common = common_type_t<_Ptr1, _Ptr2>;
return less<_Common>{}(_Left.get(), _Right.get());
}
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator>=(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
return !(_Left < _Right);
}
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator>(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
return _Right < _Left;
}
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
_NODISCARD bool operator<=(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
return !(_Right < _Left);
}
#ifdef __cpp_lib_concepts
// clang-format off
template <class _Ty1, class _Dx1, class _Ty2, class _Dx2>
requires three_way_comparable_with<typename unique_ptr<_Ty1, _Dx1>::pointer,
typename unique_ptr<_Ty2, _Dx2>::pointer>
_NODISCARD compare_three_way_result_t<typename unique_ptr<_Ty1, _Dx1>::pointer,
typename unique_ptr<_Ty2, _Dx2>::pointer>
operator<=>(const unique_ptr<_Ty1, _Dx1>& _Left, const unique_ptr<_Ty2, _Dx2>& _Right) {
// clang-format on
return _Left.get() <=> _Right.get();
}
#endif // __cpp_lib_concepts
template <class _Ty, class _Dx>
_NODISCARD bool operator==(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t) noexcept {
return !_Left;
}
#if !_HAS_CXX20
template <class _Ty, class _Dx>
_NODISCARD bool operator==(nullptr_t, const unique_ptr<_Ty, _Dx>& _Right) noexcept {
return !_Right;
}
template <class _Ty, class _Dx>
_NODISCARD bool operator!=(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t _Right) noexcept {
return !(_Left == _Right);
}
template <class _Ty, class _Dx>
_NODISCARD bool operator!=(nullptr_t _Left, const unique_ptr<_Ty, _Dx>& _Right) noexcept {
return !(_Left == _Right);
}
#endif // !_HAS_CXX20
template <class _Ty, class _Dx>
_NODISCARD bool operator<(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t _Right) {
using _Ptr = typename unique_ptr<_Ty, _Dx>::pointer;
return less<_Ptr>{}(_Left.get(), _Right);
}
template <class _Ty, class _Dx>
_NODISCARD bool operator<(nullptr_t _Left, const unique_ptr<_Ty, _Dx>& _Right) {
using _Ptr = typename unique_ptr<_Ty, _Dx>::pointer;
return less<_Ptr>{}(_Left, _Right.get());
}
template <class _Ty, class _Dx>
_NODISCARD bool operator>=(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t _Right) {
return !(_Left < _Right);
}
template <class _Ty, class _Dx>
_NODISCARD bool operator>=(nullptr_t _Left, const unique_ptr<_Ty, _Dx>& _Right) {
return !(_Left < _Right);
}
template <class _Ty, class _Dx>
_NODISCARD bool operator>(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t _Right) {
return _Right < _Left;
}
template <class _Ty, class _Dx>
_NODISCARD bool operator>(nullptr_t _Left, const unique_ptr<_Ty, _Dx>& _Right) {
return _Right < _Left;
}
template <class _Ty, class _Dx>
_NODISCARD bool operator<=(const unique_ptr<_Ty, _Dx>& _Left, nullptr_t _Right) {
return !(_Right < _Left);
}
template <class _Ty, class _Dx>
_NODISCARD bool operator<=(nullptr_t _Left, const unique_ptr<_Ty, _Dx>& _Right) {
return !(_Right < _Left);
}
#ifdef __cpp_lib_concepts
// clang-format off
template <class _Ty, class _Dx>
requires three_way_comparable<typename unique_ptr<_Ty, _Dx>::pointer>
_NODISCARD compare_three_way_result_t<typename unique_ptr<_Ty, _Dx>::pointer> operator<=>(
const unique_ptr<_Ty, _Dx>& _Left, nullptr_t) {
// clang-format on
return _Left.get() <=> static_cast<typename unique_ptr<_Ty, _Dx>::pointer>(nullptr);
}
#endif // __cpp_lib_concepts
template <class _OutTy, class _PxTy, class = void>
struct _Can_stream_unique_ptr : false_type {};
template <class _OutTy, class _PxTy>
struct _Can_stream_unique_ptr<_OutTy, _PxTy, void_t<decltype(_STD declval<_OutTy>() << _STD declval<_PxTy>().get())>>
: true_type {};
template <class _Elem, class _Traits, class _Yty, class _Dx,
enable_if_t<_Can_stream_unique_ptr<basic_ostream<_Elem, _Traits>&, const unique_ptr<_Yty, _Dx>&>::value, int> = 0>
basic_ostream<_Elem, _Traits>& operator<<(basic_ostream<_Elem, _Traits>& _Out, const unique_ptr<_Yty, _Dx>& _Px) {
// write contained pointer to stream
_Out << _Px.get();
return _Out;
}
// GARBAGE COLLECTION
#if _HAS_GARBAGE_COLLECTION_SUPPORT_DELETED_IN_CXX23
enum class pointer_safety { relaxed, preferred, strict };
inline void declare_reachable(void*) {}
template <class _Ty>
_Ty* undeclare_reachable(_Ty* _Ptr) {
return _Ptr;
}
inline void declare_no_pointers(char*, size_t) {}
inline void undeclare_no_pointers(char*, size_t) {}
inline pointer_safety get_pointer_safety() noexcept {
return pointer_safety::relaxed;
}
#endif // _HAS_GARBAGE_COLLECTION_SUPPORT_DELETED_IN_CXX23
// STRUCT TEMPLATE owner_less
template <class _Ty = void>
struct owner_less; // not defined
template <class _Ty>
struct owner_less<shared_ptr<_Ty>> {
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef shared_ptr<_Ty> _FIRST_ARGUMENT_TYPE_NAME;
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef shared_ptr<_Ty> _SECOND_ARGUMENT_TYPE_NAME;
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef bool _RESULT_TYPE_NAME;
_NODISCARD bool operator()(const shared_ptr<_Ty>& _Left, const shared_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
_NODISCARD bool operator()(const shared_ptr<_Ty>& _Left, const weak_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
_NODISCARD bool operator()(const weak_ptr<_Ty>& _Left, const shared_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
};
template <class _Ty>
struct owner_less<weak_ptr<_Ty>> {
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef weak_ptr<_Ty> _FIRST_ARGUMENT_TYPE_NAME;
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef weak_ptr<_Ty> _SECOND_ARGUMENT_TYPE_NAME;
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef bool _RESULT_TYPE_NAME;
_NODISCARD bool operator()(const weak_ptr<_Ty>& _Left, const weak_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
_NODISCARD bool operator()(const weak_ptr<_Ty>& _Left, const shared_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
_NODISCARD bool operator()(const shared_ptr<_Ty>& _Left, const weak_ptr<_Ty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
};
template <>
struct owner_less<void> {
template <class _Ty, class _Uty>
_NODISCARD bool operator()(const shared_ptr<_Ty>& _Left, const shared_ptr<_Uty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
template <class _Ty, class _Uty>
_NODISCARD bool operator()(const shared_ptr<_Ty>& _Left, const weak_ptr<_Uty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
template <class _Ty, class _Uty>
_NODISCARD bool operator()(const weak_ptr<_Ty>& _Left, const shared_ptr<_Uty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
template <class _Ty, class _Uty>
_NODISCARD bool operator()(const weak_ptr<_Ty>& _Left, const weak_ptr<_Uty>& _Right) const noexcept {
return _Left.owner_before(_Right);
}
using is_transparent = int;
};
// STRUCT TEMPLATE SPECIALIZATION hash
template <class _Ty, class _Dx>
struct hash<unique_ptr<_Ty, _Dx>> : _Conditionally_enabled_hash<unique_ptr<_Ty, _Dx>,
is_default_constructible_v<hash<typename unique_ptr<_Ty, _Dx>::pointer>>> {
static size_t _Do_hash(const unique_ptr<_Ty, _Dx>& _Keyval) noexcept(
_Is_nothrow_hashable<typename unique_ptr<_Ty, _Dx>::pointer>::value) {
return hash<typename unique_ptr<_Ty, _Dx>::pointer>{}(_Keyval.get());
}
};
template <class _Ty>
struct hash<shared_ptr<_Ty>> {
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef shared_ptr<_Ty> _ARGUMENT_TYPE_NAME;
_CXX17_DEPRECATE_ADAPTOR_TYPEDEFS typedef size_t _RESULT_TYPE_NAME;
_NODISCARD size_t operator()(const shared_ptr<_Ty>& _Keyval) const noexcept {
return hash<typename shared_ptr<_Ty>::element_type*>()(_Keyval.get());
}
};
// FUNCTION align
inline void* align(size_t _Bound, size_t _Size, void*& _Ptr, size_t& _Space) noexcept /* strengthened */ {
// try to carve out _Size bytes on boundary _Bound
size_t _Off = static_cast<size_t>(reinterpret_cast<uintptr_t>(_Ptr) & (_Bound - 1));
if (_Off != 0) {
_Off = _Bound - _Off; // number of bytes to skip
}
if (_Space < _Off || _Space - _Off < _Size) {
return nullptr;
}
// enough room, update
_Ptr = static_cast<char*>(_Ptr) + _Off;
_Space -= _Off;
return _Ptr;
}
#if _HAS_CXX20
template <size_t _Nx, class _Ty>
_NODISCARD constexpr _Ty* assume_aligned(_Ty* const _Ptr) noexcept /* strengthened */ {
if (_STD is_constant_evaluated()) {
return _Ptr;
} else {
// this enforces the requirement that _Nx be a power of two
return static_cast<_Ty*>(__builtin_assume_aligned(_Ptr, _Nx));
}
}
#endif // _HAS_CXX20
// SPIN LOCKS
_EXTERN_C
_CRTIMP2_PURE void __cdecl _Lock_shared_ptr_spin_lock();
_CRTIMP2_PURE void __cdecl _Unlock_shared_ptr_spin_lock();
_END_EXTERN_C
// WRAP SPIN-LOCK
struct _Shared_ptr_spin_lock { // class to manage a spin lock for shared_ptr atomic operations
_Shared_ptr_spin_lock() { // lock the spin lock
_Lock_shared_ptr_spin_lock();
}
~_Shared_ptr_spin_lock() noexcept { // unlock the spin lock
_Unlock_shared_ptr_spin_lock();
}
};
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT _NODISCARD bool atomic_is_lock_free(const shared_ptr<_Ty>*) {
// return true if atomic operations on shared_ptr<_Ty> are lock-free
return false;
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT _NODISCARD shared_ptr<_Ty> atomic_load_explicit(
const shared_ptr<_Ty>* _Ptr, memory_order) {
// load *_Ptr atomically
_Shared_ptr_spin_lock _Lock;
shared_ptr<_Ty> _Result = *_Ptr;
return _Result;
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT _NODISCARD shared_ptr<_Ty> atomic_load(
const shared_ptr<_Ty>* _Ptr) { // load *_Ptr atomically
return _STD atomic_load_explicit(_Ptr, memory_order_seq_cst);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT void atomic_store_explicit(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty> _Other, memory_order) {
// store _Other to *_Ptr atomically
_Shared_ptr_spin_lock _Lock;
_Ptr->swap(_Other);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT void atomic_store(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty> _Other) { // store _Other to *_Ptr atomically
_STD atomic_store_explicit(_Ptr, _STD move(_Other), memory_order_seq_cst);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT shared_ptr<_Ty> atomic_exchange_explicit(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty> _Other, memory_order) {
// copy _Other to *_Ptr and return previous value of *_Ptr atomically
_Shared_ptr_spin_lock _Lock;
_Ptr->swap(_Other);
return _Other;
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT shared_ptr<_Ty> atomic_exchange(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty> _Other) {
// copy _Other to *_Ptr and return previous value of *_Ptr atomically
return _STD atomic_exchange_explicit(_Ptr, _STD move(_Other), memory_order_seq_cst);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT bool atomic_compare_exchange_weak_explicit(shared_ptr<_Ty>* _Ptr,
shared_ptr<_Ty>* _Exp, shared_ptr<_Ty> _Value, memory_order, memory_order) { // atomically compare and exchange
shared_ptr<_Ty> _Old_exp; // destroyed outside spin lock
_Shared_ptr_spin_lock _Lock;
bool _Success = _Ptr->get() == _Exp->get() && !_Ptr->owner_before(*_Exp) && !_Exp->owner_before(*_Ptr);
if (_Success) {
_Ptr->swap(_Value);
} else { // match failed
_Exp->swap(_Old_exp);
*_Exp = *_Ptr;
}
return _Success;
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT bool atomic_compare_exchange_weak(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty>* _Exp, shared_ptr<_Ty> _Value) {
// atomically compare and exchange
return _STD atomic_compare_exchange_weak_explicit(
_Ptr, _Exp, _STD move(_Value), memory_order_seq_cst, memory_order_seq_cst);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT bool atomic_compare_exchange_strong_explicit(shared_ptr<_Ty>* _Ptr,
shared_ptr<_Ty>* _Exp, shared_ptr<_Ty> _Value, memory_order, memory_order) { // atomically compare and exchange
return _STD atomic_compare_exchange_weak_explicit(
_Ptr, _Exp, _STD move(_Value), memory_order_seq_cst, memory_order_seq_cst);
}
template <class _Ty>
_CXX20_DEPRECATE_OLD_SHARED_PTR_ATOMIC_SUPPORT bool atomic_compare_exchange_strong(
shared_ptr<_Ty>* _Ptr, shared_ptr<_Ty>* _Exp, shared_ptr<_Ty> _Value) {
// atomically compare and exchange
return _STD atomic_compare_exchange_strong_explicit(
_Ptr, _Exp, _STD move(_Value), memory_order_seq_cst, memory_order_seq_cst);
}
#if _HAS_CXX20
template <class _Ty>
class alignas(2 * sizeof(void*)) _Atomic_ptr_base {
// overalignment is to allow potential future use of cmpxchg16b
protected:
constexpr _Atomic_ptr_base() noexcept = default;
_Atomic_ptr_base(_Ty* const _Px, _Ref_count_base* const _Ref) noexcept : _Ptr(_Px), _Repptr(_Ref) {}
void _Wait(_Ty* _Old, memory_order) const noexcept {
for (;;) {
auto _Rep = _Repptr._Lock_and_load();
bool _Equal = _Ptr.load(memory_order_relaxed) == _Old;
_Repptr._Store_and_unlock(_Rep);
if (!_Equal) {
break;
}
__std_atomic_wait_direct(&_Ptr, &_Old, sizeof(_Old), _Atomic_wait_no_timeout);
}
}
void notify_one() noexcept {
_Ptr.notify_one();
}
void notify_all() noexcept {
_Ptr.notify_all();
}
atomic<_Ty*> _Ptr{nullptr};
mutable _Locked_pointer<_Ref_count_base> _Repptr;
};
template <class _Ty>
struct atomic<shared_ptr<_Ty>> : private _Atomic_ptr_base<_Ty> {
private:
using _Base = _Atomic_ptr_base<_Ty>;
public:
using value_type = shared_ptr<_Ty>;
static constexpr bool is_always_lock_free = false;
_NODISCARD bool is_lock_free() const noexcept {
return false;
}
void store(shared_ptr<_Ty> _Value, const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_store_memory_order(_Order);
const auto _Rep = this->_Repptr._Lock_and_load();
_Ty* const _Tmp = _Value._Ptr;
_Value._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Tmp, memory_order_relaxed);
this->_Repptr._Store_and_unlock(_Value._Rep);
_Value._Rep = _Rep;
}
_NODISCARD shared_ptr<_Ty> load(const memory_order _Order = memory_order_seq_cst) const noexcept {
_Check_load_memory_order(_Order);
shared_ptr<_Ty> _Result;
const auto _Rep = this->_Repptr._Lock_and_load();
_Result._Ptr = this->_Ptr.load(memory_order_relaxed);
_Result._Rep = _Rep;
_Result._Incref();
this->_Repptr._Store_and_unlock(_Rep);
return _Result;
}
operator shared_ptr<_Ty>() const noexcept {
return load();
}
shared_ptr<_Ty> exchange(shared_ptr<_Ty> _Value, const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_memory_order(_Order);
shared_ptr<_Ty> _Result;
_Result._Rep = this->_Repptr._Lock_and_load();
_Result._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Value._Ptr, memory_order_relaxed);
this->_Repptr._Store_and_unlock(_Value._Rep);
_Value._Ptr = nullptr; // ownership of _Value ref has been given to this, silence decrement
_Value._Rep = nullptr;
return _Result;
}
bool compare_exchange_weak(shared_ptr<_Ty>& _Expected, shared_ptr<_Ty> _Desired, const memory_order _Success,
const memory_order _Failure) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Combine_cas_memory_orders(_Success, _Failure));
}
bool compare_exchange_strong(shared_ptr<_Ty>& _Expected, shared_ptr<_Ty> _Desired, const memory_order _Success,
const memory_order _Failure) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Combine_cas_memory_orders(_Success, _Failure));
}
bool compare_exchange_weak(shared_ptr<_Ty>& _Expected, shared_ptr<_Ty> _Desired,
const memory_order _Order = memory_order_seq_cst) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Order);
}
bool compare_exchange_strong(shared_ptr<_Ty>& _Expected, shared_ptr<_Ty> _Desired,
const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_memory_order(_Order);
auto _Rep = this->_Repptr._Lock_and_load();
if (this->_Ptr.load(memory_order_relaxed) == _Expected._Ptr && _Rep == _Expected._Rep) {
_Ty* const _Tmp = _Desired._Ptr;
_Desired._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Tmp, memory_order_relaxed);
_STD swap(_Rep, _Desired._Rep);
this->_Repptr._Store_and_unlock(_Rep);
return true;
}
_Ref_count_base* _Expected_rep = _Expected._Rep;
_Expected._Ptr = this->_Ptr.load(memory_order_relaxed);
_Expected._Rep = _Rep;
_Expected._Incref();
this->_Repptr._Store_and_unlock(_Rep);
if (_Expected_rep) {
_Expected_rep->_Decref();
}
return false;
}
void wait(shared_ptr<_Ty> _Old, memory_order _Order = memory_order_seq_cst) const noexcept {
this->_Wait(_Old._Ptr, _Order);
}
using _Base::notify_all;
using _Base::notify_one;
constexpr atomic() noexcept = default;
atomic(const shared_ptr<_Ty> _Value) noexcept : _Base(_Value._Ptr, _Value._Rep) {
_Value._Incref();
}
atomic(const atomic&) = delete;
void operator=(const atomic&) = delete;
void operator=(shared_ptr<_Ty> _Value) noexcept {
store(_STD move(_Value));
}
~atomic() {
const auto _Rep = this->_Repptr._Unsafe_load_relaxed();
if (_Rep) {
_Rep->_Decref();
}
}
};
template <class _Ty>
struct atomic<weak_ptr<_Ty>> : private _Atomic_ptr_base<_Ty> {
private:
using _Base = _Atomic_ptr_base<_Ty>;
public:
using value_type = weak_ptr<_Ty>;
static constexpr bool is_always_lock_free = false;
_NODISCARD bool is_lock_free() const noexcept {
return false;
}
void store(weak_ptr<_Ty> _Value, const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_store_memory_order(_Order);
const auto _Rep = this->_Repptr._Lock_and_load();
_Ty* const _Tmp = _Value._Ptr;
_Value._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Tmp, memory_order_relaxed);
this->_Repptr._Store_and_unlock(_Value._Rep);
_Value._Rep = _Rep;
}
_NODISCARD weak_ptr<_Ty> load(const memory_order _Order = memory_order_seq_cst) const noexcept {
_Check_load_memory_order(_Order);
weak_ptr<_Ty> _Result;
const auto _Rep = this->_Repptr._Lock_and_load();
_Result._Ptr = this->_Ptr.load(memory_order_relaxed);
_Result._Rep = _Rep;
_Result._Incwref();
this->_Repptr._Store_and_unlock(_Rep);
return _Result;
}
operator weak_ptr<_Ty>() const noexcept {
return load();
}
weak_ptr<_Ty> exchange(weak_ptr<_Ty> _Value, const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_memory_order(_Order);
weak_ptr<_Ty> _Result;
_Result._Rep = this->_Repptr._Lock_and_load();
_Result._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Value._Ptr, memory_order_relaxed);
this->_Repptr._Store_and_unlock(_Value._Rep);
_Value._Ptr = nullptr; // ownership of _Value ref has been given to this, silence decrement
_Value._Rep = nullptr;
return _Result;
}
bool compare_exchange_weak(weak_ptr<_Ty>& _Expected, weak_ptr<_Ty> _Desired, const memory_order _Success,
const memory_order _Failure) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Combine_cas_memory_orders(_Success, _Failure));
}
bool compare_exchange_strong(weak_ptr<_Ty>& _Expected, weak_ptr<_Ty> _Desired, const memory_order _Success,
const memory_order _Failure) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Combine_cas_memory_orders(_Success, _Failure));
}
bool compare_exchange_weak(
weak_ptr<_Ty>& _Expected, weak_ptr<_Ty> _Desired, const memory_order _Order = memory_order_seq_cst) noexcept {
return compare_exchange_strong(_Expected, _STD move(_Desired), _Order);
}
bool compare_exchange_strong(
weak_ptr<_Ty>& _Expected, weak_ptr<_Ty> _Desired, const memory_order _Order = memory_order_seq_cst) noexcept {
_Check_memory_order(_Order);
auto _Rep = this->_Repptr._Lock_and_load();
if (this->_Ptr.load(memory_order_relaxed) == _Expected._Ptr && _Rep == _Expected._Rep) {
_Ty* const _Tmp = _Desired._Ptr;
_Desired._Ptr = this->_Ptr.load(memory_order_relaxed);
this->_Ptr.store(_Tmp, memory_order_relaxed);
_STD swap(_Rep, _Desired._Rep);
this->_Repptr._Store_and_unlock(_Rep);
return true;
}
const auto _Expected_rep = _Expected._Rep;
_Expected._Ptr = this->_Ptr.load(memory_order_relaxed);
_Expected._Rep = _Rep;
_Expected._Incwref();
this->_Repptr._Store_and_unlock(_Rep);
if (_Expected_rep) {
_Expected_rep->_Decwref();
}
return false;
}
void wait(weak_ptr<_Ty> _Old, memory_order _Order = memory_order_seq_cst) const noexcept {
this->_Wait(_Old._Ptr, _Order);
}
using _Base::notify_all;
using _Base::notify_one;
constexpr atomic() noexcept = default;
atomic(const weak_ptr<_Ty> _Value) noexcept : _Base(_Value._Ptr, _Value._Rep) {
_Value._Incwref();
}
atomic(const atomic&) = delete;
void operator=(const atomic&) = delete;
void operator=(weak_ptr<_Ty> _Value) noexcept {
store(_STD move(_Value));
}
~atomic() {
const auto _Rep = this->_Repptr._Unsafe_load_relaxed();
if (_Rep) {
_Rep->_Decwref();
}
}
};
#endif // _HAS_CXX20
#if _HAS_TR1_NAMESPACE
namespace _DEPRECATE_TR1_NAMESPACE tr1 {
using _STD allocate_shared;
using _STD bad_weak_ptr;
using _STD const_pointer_cast;
using _STD dynamic_pointer_cast;
using _STD enable_shared_from_this;
using _STD get_deleter;
using _STD make_shared;
using _STD shared_ptr;
using _STD static_pointer_cast;
using _STD swap;
using _STD weak_ptr;
} // namespace tr1
#endif // _HAS_TR1_NAMESPACE
_STD_END
#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _MEMORY_