microsoft
/
STL
зеркало из https://github.com/microsoft/STL.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
STL/stl/inc/xhash

2148 строки
87 KiB
C++
Исходник Ответственный История

// xhash internal header
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#pragma once
#ifndef _XHASH_
#define _XHASH_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#include <cmath>
#include <cstring>
#include <cwchar>
#include <list>
#include <tuple>
#include <vector>
#include <xbit_ops.h>
#include <xstring>
#if _HAS_CXX17
#include <xnode_handle.h>
#endif // _HAS_CXX17
#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
namespace stdext {
using _STD basic_string;
using _STD less;
using _STD size_t;
// FUNCTION TEMPLATE hash_value
#if _HAS_IF_CONSTEXPR
template <class _Kty>
_NODISCARD size_t hash_value(const _Kty& _Keyval) noexcept {
if constexpr (_STD is_pointer_v<_Kty> || _STD is_null_pointer_v<_Kty>) {
return reinterpret_cast<size_t>(_Keyval) ^ 0xdeadbeefu;
} else {
return static_cast<size_t>(_Keyval) ^ 0xdeadbeefu;
}
}
#else // ^^^ _HAS_IF_CONSTEXPR / !_HAS_IF_CONSTEXPR vvv
template <class _Kty>
_NODISCARD size_t _Hash_value(_STD true_type, const _Kty& _Keyval) noexcept {
return reinterpret_cast<size_t>(_Keyval) ^ 0xdeadbeefu;
}
template <class _Kty>
_NODISCARD size_t _Hash_value(_STD false_type, const _Kty& _Keyval) noexcept {
return static_cast<size_t>(_Keyval) ^ 0xdeadbeefu;
}
template <class _Kty>
_NODISCARD size_t hash_value(const _Kty& _Keyval) noexcept {
return _Hash_value(_STD disjunction<_STD is_pointer<_Kty>, _STD is_null_pointer<_Kty>>{}, _Keyval);
}
#endif // _HAS_IF_CONSTEXPR
template <class _Elem, class _Traits, class _Alloc>
_NODISCARD size_t hash_value(const basic_string<_Elem, _Traits, _Alloc>& _Str) noexcept {
return _STD _Hash_array_representation(_Str.c_str(), _Str.size());
}
_NODISCARD inline size_t hash_value(_In_z_ const char* _Str) noexcept {
return _STD _Hash_array_representation(_Str, _CSTD strlen(_Str));
}
_NODISCARD inline size_t hash_value(_In_z_ const wchar_t* _Str) noexcept {
return _STD _Hash_array_representation(_Str, _CSTD wcslen(_Str));
}
// CLASS TEMPLATE hash_compare
template <class _Kty, class _Pr = less<_Kty>>
class hash_compare { // traits class for hash containers
public:
enum { // parameters for hash table
bucket_size = 1 // 0 < bucket_size
};
hash_compare() = default;
hash_compare(const _Pr& _Pred) noexcept(_STD is_nothrow_copy_constructible_v<_Pr>) : comp(_Pred) {}
_NODISCARD size_t operator()(const _Kty& _Keyval) const noexcept(noexcept(hash_value(_Keyval))) {
long _Quot = static_cast<long>(hash_value(_Keyval) & LONG_MAX); // TRANSITION, ADL?
ldiv_t _Qrem = _CSTD ldiv(_Quot, 127773);
_Qrem.rem = 16807 * _Qrem.rem - 2836 * _Qrem.quot;
if (_Qrem.rem < 0) {
_Qrem.rem += LONG_MAX;
}
return static_cast<size_t>(_Qrem.rem);
}
_NODISCARD bool operator()(const _Kty& _Keyval1, const _Kty& _Keyval2) const
noexcept(noexcept(comp(_Keyval1, _Keyval2))) {
// test if _Keyval1 ordered before _Keyval2
return comp(_Keyval1, _Keyval2);
}
_Pr comp{}; // the comparator object
};
} // namespace stdext
_STD_BEGIN
using stdext::hash_compare; // TRANSITION, protobuf used this until v3.7.0, released Feb 28, 2019
template <class _Kty, class _Hasher, class _Keyeq, class = void>
struct _Uhash_choose_transparency {
// transparency selector for non-transparent hashed containers
template <class>
using _Deduce_key = const _Kty&;
};
#if _HAS_CXX20
template <class _Kty, class _Hasher, class _Keyeq>
struct _Uhash_choose_transparency<_Kty, _Hasher, _Keyeq,
void_t<typename _Hasher::is_transparent, typename _Keyeq::is_transparent>> {
// transparency selector for transparent hashed containers
template <class _Keyty>
using _Deduce_key = const _Keyty&;
};
#endif // _HAS_CXX20
template <class _Hasher, class _Kty>
_INLINE_VAR constexpr bool _Nothrow_hash = noexcept(
static_cast<size_t>(_STD declval<const _Hasher&>()(_STD declval<const _Kty&>())));
// CLASS TEMPLATE _Uhash_compare
template <class _Kty, class _Hasher, class _Keyeq>
class _Uhash_compare
: public _Uhash_choose_transparency<_Kty, _Hasher, _Keyeq> { // traits class for unordered containers
public:
enum { // parameters for hash table
bucket_size = 1 // 0 < bucket_size
};
_Uhash_compare() noexcept(
conjunction_v<is_nothrow_default_constructible<_Hasher>, is_nothrow_default_constructible<_Keyeq>>)
: _Mypair(_Zero_then_variadic_args_t{}, _Zero_then_variadic_args_t{}, 0.0f) {}
explicit _Uhash_compare(const _Hasher& _Hasharg) noexcept(
conjunction_v<is_nothrow_copy_constructible<_Hasher>, is_nothrow_default_constructible<_Keyeq>>)
: _Mypair(_One_then_variadic_args_t{}, _Hasharg, _Zero_then_variadic_args_t{}, 0.0f) {}
explicit _Uhash_compare(const _Hasher& _Hasharg, const _Keyeq& _Keyeqarg) noexcept(
conjunction_v<is_nothrow_copy_constructible<_Hasher>, is_nothrow_copy_constructible<_Keyeq>>)
: _Mypair(_One_then_variadic_args_t{}, _Hasharg, _One_then_variadic_args_t{}, _Keyeqarg, 0.0f) {}
template <class _Keyty>
_NODISCARD size_t operator()(const _Keyty& _Keyval) const noexcept(_Nothrow_hash<_Hasher, _Keyty>) {
// hash _Keyval to size_t value
return static_cast<size_t>(_Mypair._Get_first()(_Keyval));
}
template <class _Keyty1, class _Keyty2>
_NODISCARD bool operator()(const _Keyty1& _Keyval1, const _Keyty2& _Keyval2) const
noexcept(_Nothrow_compare<_Keyeq, _Keyty1, _Keyty2>) {
// test if _Keyval1 NOT equal to _Keyval2
return !static_cast<bool>(_Mypair._Myval2._Get_first()(_Keyval1, _Keyval2));
}
_NODISCARD float& _Get_max_bucket_size() noexcept {
return _Mypair._Myval2._Myval2;
}
_NODISCARD const float& _Get_max_bucket_size() const noexcept {
return _Mypair._Myval2._Myval2;
}
void swap(_Uhash_compare& _Rhs) noexcept(
conjunction_v<_Is_nothrow_swappable<_Hasher>, _Is_nothrow_swappable<_Keyeq>>) {
_Swap_adl(_Mypair._Get_first(), _Rhs._Mypair._Get_first());
auto& _Lsecond = _Mypair._Myval2;
auto& _Rsecond = _Rhs._Mypair._Myval2;
_Swap_adl(_Lsecond._Get_first(), _Rsecond._Get_first());
_STD swap(_Lsecond._Myval2, _Rsecond._Myval2);
}
_Compressed_pair<_Hasher, _Compressed_pair<_Keyeq, float>> _Mypair;
};
// CLASS TEMPLATE _Reinterpret_move_iter
template <class _Iter, class _Val>
struct _Reinterpret_move_iter {
_Iter _Base;
using iterator_category = input_iterator_tag;
using value_type = typename iterator_traits<_Iter>::value_type;
using difference_type = typename iterator_traits<_Iter>::difference_type;
using reference = _Val&&;
// pointer intentionally omitted
reference operator*() const {
return static_cast<reference>(reinterpret_cast<_Val&>(*_Base));
}
_Reinterpret_move_iter& operator++() {
++_Base;
return *this;
}
// post ++ intentionally omitted
#ifndef __CUDACC__ // TRANSITION, VSO-568006
_NODISCARD
#endif // TRANSITION, VSO-568006
friend bool operator==(const _Reinterpret_move_iter& _Lhs, const _Reinterpret_move_iter& _Rhs) {
return _Lhs._Base == _Rhs._Base;
}
#ifndef __CUDACC__ // TRANSITION, VSO-568006
_NODISCARD
#endif // TRANSITION, VSO-568006
friend bool operator!=(const _Reinterpret_move_iter& _Lhs, const _Reinterpret_move_iter& _Rhs) {
return _Lhs._Base != _Rhs._Base;
}
};
// STRUCT TEMPLATE _List_head_construct_ptr
template <class _Alnode>
struct _List_head_construct_ptr {
using value_type = typename _Alnode::value_type;
static_assert(_Is_specialization_v<value_type, _List_node>, "_List_head_construct_ptr allocator not rebound");
using _Alnode_traits = allocator_traits<_Alnode>;
using pointer = typename _Alnode_traits::pointer;
_Alnode& _Al;
pointer _Newhead;
explicit _List_head_construct_ptr(_Alnode& _Al_) : _Al(_Al_), _Newhead(value_type::_Buyheadnode(_Al)) {}
template <class _Val_types>
_List_head_construct_ptr(_Alnode& _Al_, _List_val<_Val_types>& _Mycont)
: _Al(_Al_), _Newhead(value_type::_Buyheadnode(_Al)) {
_Mycont._Myhead = _Newhead;
}
_List_head_construct_ptr(const _List_head_construct_ptr&) = delete;
_List_head_construct_ptr& operator=(const _List_head_construct_ptr&) = delete;
_NODISCARD pointer _Release() noexcept {
return _STD exchange(_Newhead, nullptr);
}
~_List_head_construct_ptr() {
if (_Newhead) {
value_type::_Freenode0(_Al, _Newhead);
}
}
};
template <class _Nodeptr>
struct _Hash_find_last_result {
_Nodeptr _Insert_before;
_Nodeptr _Duplicate;
};
template <class _Aliter>
struct _Hash_vec {
// TRANSITION, ABI: "vector" for ABI compatibility that doesn't call allocator::construct
using _Aliter_traits = allocator_traits<_Aliter>;
using value_type = typename _Aliter::value_type;
using size_type = typename _Aliter_traits::size_type;
using difference_type = typename _Aliter_traits::difference_type;
using pointer = typename _Aliter_traits::pointer;
using _Aliter_scary_val = _Vector_val<conditional_t<_Is_simple_alloc_v<_Aliter>, _Simple_types<value_type>,
_Vec_iter_types<value_type, size_type, difference_type, pointer, typename _Aliter_traits::const_pointer,
value_type&, const value_type&>>>;
_Hash_vec() : _Mypair(_Zero_then_variadic_args_t{}) {
_Mypair._Myval2._Alloc_proxy(_GET_PROXY_ALLOCATOR(_Aliter, _Mypair._Get_first()));
}
template <class _Any_alloc, enable_if_t<!is_same_v<_Remove_cvref_t<_Any_alloc>, _Hash_vec>, int> = 0>
explicit _Hash_vec(_Any_alloc&& _Al) noexcept
: _Mypair(_One_then_variadic_args_t{}, _STD forward<_Any_alloc>(_Al)) { // construct empty vector, allocator
_Mypair._Myval2._Alloc_proxy(_GET_PROXY_ALLOCATOR(_Aliter, _Mypair._Get_first()));
}
_Hash_vec(const _Hash_vec&) = delete;
_Hash_vec& operator=(const _Hash_vec&) = delete;
_NODISCARD size_type size() const noexcept {
return static_cast<size_type>(_Mypair._Myval2._Mylast - _Mypair._Myval2._Myfirst);
}
_NODISCARD size_type max_size() const noexcept {
return (_STD min)(static_cast<size_type>((numeric_limits<difference_type>::max)()),
_Aliter_traits::max_size(_Mypair._Get_first()));
}
void _Assign_grow(const size_type _Cells, const value_type _Val) {
// set the elements stored here to _Cells copies of _Val, leaving the value unchanged if an exception is thrown
const auto _Oldsize = size();
_STL_INTERNAL_CHECK(_Oldsize <= _Cells);
auto& _Alvec = _Mypair._Get_first();
if (_Oldsize < _Cells) {
const auto _Newvec = _Alvec.allocate(_Cells); // throws
// nothrow hereafter
if (_Oldsize != 0) {
_Destroy_range(_Mypair._Myval2._Myfirst, _Mypair._Myval2._Mylast);
_Alvec.deallocate(_Mypair._Myval2._Myfirst, _Oldsize);
}
_Mypair._Myval2._Myfirst = _Newvec;
const auto _Newend = _Newvec + _Cells;
_Mypair._Myval2._Mylast = _Newend;
_Mypair._Myval2._Myend = _Newend;
_STD uninitialized_fill(_Newvec, _Newend, _Val);
} else {
_STD fill(_Mypair._Myval2._Myfirst, _Mypair._Myval2._Mylast, _Val);
}
}
void _Tidy() noexcept {
_Destroy_range(_Mypair._Myval2._Myfirst, _Mypair._Myval2._Mylast);
_Mypair._Get_first().deallocate(_Mypair._Myval2._Myfirst, size());
_Mypair._Myval2._Myfirst = pointer();
_Mypair._Myval2._Mylast = pointer();
_Mypair._Myval2._Myend = pointer();
}
~_Hash_vec() {
_Tidy();
#if _ITERATOR_DEBUG_LEVEL != 0
auto&& _Alproxy = _GET_PROXY_ALLOCATOR(_Aliter, _Mypair._Get_first());
_Delete_plain_internal(_Alproxy, _STD exchange(_Mypair._Myval2._Myproxy, nullptr));
#endif // _ITERATOR_DEBUG_LEVEL != 0
}
_Compressed_pair<_Aliter, _Aliter_scary_val> _Mypair;
};
// CLASS TEMPLATE _Hash
template <class _Traits>
class _Hash { // hash table -- list with vector of iterators for quick access
protected:
using _Mylist = list<typename _Traits::value_type, typename _Traits::allocator_type>;
using _Alnode = typename _Mylist::_Alnode;
using _Alnode_traits = typename _Mylist::_Alnode_traits;
using _Node = typename _Mylist::_Node;
using _Nodeptr = typename _Mylist::_Nodeptr;
using _Mutable_value_type = typename _Traits::_Mutable_value_type;
using _Key_compare = typename _Traits::key_compare;
using _Value_compare = typename _Traits::value_compare;
public:
using key_type = typename _Traits::key_type;
using value_type = typename _Mylist::value_type;
using allocator_type = typename _Mylist::allocator_type;
using size_type = typename _Mylist::size_type;
using difference_type = typename _Mylist::difference_type;
using pointer = typename _Mylist::pointer;
using const_pointer = typename _Mylist::const_pointer;
using reference = value_type&;
using const_reference = const value_type&;
using iterator =
conditional_t<is_same_v<key_type, value_type>, typename _Mylist::const_iterator, typename _Mylist::iterator>;
using const_iterator = typename _Mylist::const_iterator;
using _Unchecked_iterator = conditional_t<is_same_v<key_type, value_type>,
typename _Mylist::_Unchecked_const_iterator, typename _Mylist::_Unchecked_iterator>;
using _Unchecked_const_iterator = typename _Mylist::_Unchecked_const_iterator;
using _Aliter = _Rebind_alloc_t<_Alnode, _Unchecked_iterator>;
static constexpr size_type _Bucket_size = _Key_compare::bucket_size;
static constexpr size_type _Min_buckets = 8; // must be a positive power of 2
static constexpr bool _Multi = _Traits::_Multi;
#if !_HAS_IF_CONSTEXPR
template <class _TraitsT>
friend bool _Hash_equal_elements(const _Hash<_TraitsT>& _Left, const _Hash<_TraitsT>& _Right, false_type);
template <class _TraitsT>
friend bool _Hash_equal_elements(const _Hash<_TraitsT>& _Left, const _Hash<_TraitsT>& _Right, true_type);
#endif // !_HAS_IF_CONSTEXPR
template <class _TraitsT>
friend bool _Hash_equal(const _Hash<_TraitsT>& _Left, const _Hash<_TraitsT>& _Right);
protected:
_Hash(const _Key_compare& _Parg, const allocator_type& _Al)
: _Traitsobj(_Parg), _List(_Al), _Vec(_Al), _Mask(_Min_buckets - 1), _Maxidx(_Min_buckets) {
// construct empty hash table
_Max_bucket_size() = _Bucket_size;
_Vec._Assign_grow(_Min_buckets * 2, _List._Unchecked_end());
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
template <class _Any_alloc>
_Hash(const _Hash& _Right, const _Any_alloc& _Al)
: _Traitsobj(_Right._Traitsobj), _List(static_cast<allocator_type>(_Al)), _Vec(_Al), _Mask(_Right._Mask),
_Maxidx(_Right._Maxidx) {
// construct hash table by copying _Right
_Vec._Assign_grow(_Right._Vec.size(), _List._Unchecked_end());
insert(_Right._Unchecked_begin(), _Right._Unchecked_end());
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
_Hash(_Hash&& _Right)
: _Traitsobj(_Right._Traitsobj), _List(_Move_allocator_tag{}, _Right._List._Getal()),
_Vec(_STD move(_Right._Vec._Mypair._Get_first())) {
_Vec._Assign_grow(_Min_buckets * 2, _Unchecked_end());
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
private:
void _Move_construct_equal_alloc(_Hash& _Right) {
_Vec._Assign_grow(_Min_buckets * 2, _Unchecked_end());
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
}
public:
_Hash(_Hash&& _Right, const allocator_type& _Al) : _Traitsobj(_Right._Traitsobj), _List(_Al), _Vec(_Al) {
// construct hash table by moving _Right, allocator
if _CONSTEXPR_IF (_Alnode_traits::is_always_equal::value) {
_Move_construct_equal_alloc(_Right);
} else if (_List._Getal() == _Right._List._Getal()) {
_Move_construct_equal_alloc(_Right);
} else {
_Maxidx = _Min_buckets;
const auto _Myhead = _List._Mypair._Myval2._Myhead;
for (auto& _Val : _Right._List) {
_List._Emplace(_Myhead, reinterpret_cast<_Mutable_value_type&&>(_Val));
}
_Reinsert_with_invalid_vec();
_Right.clear();
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
private:
void _Swap_val(_Hash& _Right) noexcept { // swap contents with equal allocator _Hash _Right
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_STD swap(_Mask, _Right._Mask);
_STD swap(_Maxidx, _Right._Maxidx);
}
struct _Min_buckets_construct_ptr {
using pointer = typename allocator_traits<_Aliter>::pointer;
_Aliter& _Al;
pointer _Base;
_Min_buckets_construct_ptr(_Aliter& _Al_) : _Al(_Al_), _Base(_Al.allocate(_Min_buckets * 2)) {}
_Min_buckets_construct_ptr(const _Min_buckets_construct_ptr&) = delete;
_NODISCARD pointer _Release(_Unchecked_iterator _Newend) noexcept {
_STD uninitialized_fill(_Base, _Base + _Min_buckets * 2, _Newend);
return _STD exchange(_Base, pointer());
}
~_Min_buckets_construct_ptr() {
if (_Base) {
_Al.deallocate(_Base, _Min_buckets * 2);
}
}
};
void _Pocma_both(_Hash& _Right) {
_Pocma(_List._Getal(), _Right._List._Getal());
_Pocma(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
}
struct _Clear_guard {
_Hash* _Target;
explicit _Clear_guard(_Hash* const _Target_) : _Target(_Target_) {}
_Clear_guard(const _Clear_guard&) = delete;
_Clear_guard& operator=(const _Clear_guard&) = delete;
~_Clear_guard() {
if (_Target) {
_Target->clear();
}
}
};
void _Move_assign(_Hash& _Right, _Equal_allocators) {
clear();
_Traitsobj = _Right._Traitsobj;
_Pocma_both(_Right);
_Swap_val(_Right);
}
void _Move_assign(_Hash& _Right, _Propagate_allocators) {
if (_Getal() == _Right._Getal()) {
_Move_assign(_Right, _Equal_allocators{});
} else {
// allocate all the parts necessary to maintain _Hash invariants using _Right's allocator
auto&& _Alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Getal());
auto&& _Right_alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Right._Getal());
_Container_proxy_ptr<_Alnode> _List_proxy(_Right_alproxy, _Leave_proxy_unbound{});
_Container_proxy_ptr<_Alnode> _Vec_proxy(_Right_alproxy, _Leave_proxy_unbound{});
_List_head_construct_ptr<_Alnode> _Newhead(_Right._Getal());
_Min_buckets_construct_ptr _Buckets(_Right._Vec._Mypair._Get_first());
// assign the hash/compare ops; we have no control over whether this throws, and if it does we want to do
// nothing
_Traitsobj = _Right._Traitsobj;
// nothrow hereafter
// release any state we are currently owning, and propagate the allocators
_List._Tidy();
_Vec._Tidy();
_Pocma_both(_Right);
// assign the empty list to _Right._List (except the allocators), and take _Right's _List data
auto& _List_data = _List._Mypair._Myval2;
auto& _Right_list_data = _Right._List._Mypair._Myval2;
_List_data._Myhead = _STD exchange(_Right_list_data._Myhead, _Newhead._Release());
_List_data._Mysize = _STD exchange(_Right_list_data._Mysize, size_type{0});
_List_proxy._Bind(_Alproxy, _STD addressof(_List_data));
_List_data._Swap_proxy_and_iterators(_Right_list_data);
// assign the _Min_buckets into _Right's _Vec data and take _Right's _Vec data
auto& _Vec_data = _Vec._Mypair._Myval2;
auto& _Right_vec_data = _Right._Vec._Mypair._Myval2;
const auto _Newfirst = _Buckets._Release(_Right._Unchecked_end());
const auto _Newlast = _Newfirst + _Min_buckets * 2;
_Vec_data._Myfirst = _STD exchange(_Right_vec_data._Myfirst, _Newfirst);
_Vec_data._Mylast = _STD exchange(_Right_vec_data._Mylast, _Newlast);
_Vec_data._Myend = _STD exchange(_Right_vec_data._Myend, _Newlast);
_Vec_proxy._Bind(_Alproxy, _STD addressof(_Vec_data));
_Vec_data._Swap_proxy_and_iterators(_Right_vec_data);
// give _Right the default _Mask and _Maxidx values and take its former values
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
}
}
void _Move_assign(_Hash& _Right, _No_propagate_allocators) {
if (_Getal() == _Right._Getal()) {
_Move_assign(_Right, _Equal_allocators{});
return;
}
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
using _Adapter = _Reinterpret_move_iter<typename _Mylist::_Unchecked_iterator, _Mutable_value_type>;
_List.template _Assign_cast<_Mutable_value_type&>(
_Adapter{_Right._List._Unchecked_begin()}, _Adapter{_Right._List._Unchecked_end()});
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
}
public:
_Hash& operator=(_Hash&& _Right) { // assign by moving _Right
if (this != _STD addressof(_Right)) {
_Move_assign(_Right, _Choose_pocma<_Alnode>{});
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
return *this;
}
#if _HAS_IF_CONSTEXPR
template <class... _Valtys>
conditional_t<_Multi, iterator, pair<iterator, bool>> emplace(_Valtys&&... _Vals) {
// try to insert value_type(_Vals...)
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>;
if constexpr (_Multi) {
_Check_max_size();
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_last(_Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else if constexpr (_In_place_key_extractor::_Extractable) {
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
// invalidates _Keyval:
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {
_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
} else {
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {
_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
}
}
#else // ^^^ _HAS_IF_CONSTEXPR // !_HAS_IF_CONSTEXPR vvv
template <class... _Valtys>
iterator _Choose_emplace(integral_constant<int, 2>, _Valtys&&... _Vals) {
_Check_max_size();
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_last(_Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
template <class... _Valtys>
pair<iterator, bool> _Choose_emplace(integral_constant<int, 1>, _Valtys&&... _Vals) {
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>;
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
// invalidates _Keyval:
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
}
template <class... _Valtys>
pair<iterator, bool> _Choose_emplace(integral_constant<int, 0>, _Valtys&&... _Vals) {
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
}
template <class... _Valtys>
conditional_t<_Multi, iterator, pair<iterator, bool>> emplace(_Valtys&&... _Vals) {
constexpr int _Choice =
_Multi ? 2 : _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>::_Extractable;
return _Choose_emplace(integral_constant<int, _Choice>{}, _STD forward<_Valtys>(_Vals)...);
}
#endif // _HAS_IF_CONSTEXPR
#if _HAS_IF_CONSTEXPR
template <class... _Valtys>
iterator emplace_hint(const_iterator _Hint, _Valtys&&... _Vals) { // try to insert value_type(_Vals...)
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>;
if constexpr (_Multi) {
_Check_max_size();
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else if constexpr (_In_place_key_extractor::_Extractable) {
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
// invalidates _Keyval:
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else {
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
}
#else // ^^^ _HAS_IF_CONSTEXPR // !_HAS_IF_CONSTEXPR vvv
template <class... _Valtys>
iterator _Choose_emplace_hint(integral_constant<int, 2>, const _Nodeptr _Hint, _Valtys&&... _Vals) {
_Check_max_size();
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_hint(_Hint, _Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
template <class... _Valtys>
iterator _Choose_emplace_hint(integral_constant<int, 1>, const _Nodeptr _Hint, _Valtys&&... _Vals) {
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>;
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
// invalidates _Keyval:
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
template <class... _Valtys>
iterator _Choose_emplace_hint(integral_constant<int, 0>, const _Nodeptr _Hint, _Valtys&&... _Vals) {
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
template <class... _Valtys>
iterator emplace_hint(const_iterator _Hint, _Valtys&&... _Vals) {
constexpr int _Choice =
_Multi ? 2 : _Traits::template _In_place_key_extractor<_Remove_cvref_t<_Valtys>...>::_Extractable;
return _Choose_emplace_hint(integral_constant<int, _Choice>{}, _Hint._Ptr, _STD forward<_Valtys>(_Vals)...);
}
#endif // _HAS_IF_CONSTEXPR
protected:
template <class _Keyty, class... _Mappedty>
pair<_Nodeptr, bool> _Try_emplace(_Keyty&& _Keyval_arg, _Mappedty&&... _Mapval) {
const auto& _Keyval = _Keyval_arg;
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_Target._Duplicate, false};
}
_Check_max_size();
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), piecewise_construct,
_STD forward_as_tuple(_STD forward<_Keyty>(_Keyval_arg)),
_STD forward_as_tuple(_STD forward<_Mappedty>(_Mapval)...));
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()), true};
}
template <class _Keyty, class... _Mappedty>
_Nodeptr _Try_emplace_hint(const _Nodeptr _Hint, _Keyty&& _Keyval_arg, _Mappedty&&... _Mapval) {
const auto& _Keyval = _Keyval_arg;
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _Target._Duplicate;
}
_Check_max_size();
// might invalidate _Keyval:
_List_node_emplace_op2<_Alnode> _Newnode(_List._Getal(), piecewise_construct,
_STD forward_as_tuple(_STD forward<_Keyty>(_Keyval_arg)),
_STD forward_as_tuple(_STD forward<_Mappedty>(_Mapval)...));
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release());
}
private:
void _Pocca_both(const _Hash& _Right) {
_Pocca(_List._Getal(), _Right._List._Getal());
_Pocca(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
}
void _Copy_assign(const _Hash& _Right, false_type) {
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
_Pocca_both(_Right);
_List.template _Assign_cast<_Mutable_value_type&>(
_Right._List._Unchecked_begin(), _Right._List._Unchecked_end());
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
}
void _Copy_assign(const _Hash& _Right, true_type) {
auto& _Al = _Getal();
const auto& _Right_al = _Right._Getal();
if (_Al == _Right_al) {
_Copy_assign(_Right, false_type{});
return;
}
auto&& _Alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Al);
auto&& _Right_alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Right_al);
_Container_proxy_ptr<_Alnode> _Vec_proxy(_Right_alproxy, _Leave_proxy_unbound{});
_List._Reload_sentinel_and_proxy(_Right._List);
_Vec._Tidy();
_Pocca_both(_Right);
_Vec_proxy._Bind(_Alproxy, _STD addressof(_Vec._Mypair._Myval2));
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
_List.template _Assign_cast<_Mutable_value_type&>(
_Right._List._Unchecked_begin(), _Right._List._Unchecked_end());
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
}
public:
_Hash& operator=(const _Hash& _Right) {
if (this != _STD addressof(_Right)) {
_Copy_assign(_Right, _Choose_pocca<_Alnode>{});
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
return *this;
}
_NODISCARD iterator begin() noexcept {
return _List.begin();
}
_NODISCARD const_iterator begin() const noexcept {
return _List.begin();
}
_NODISCARD iterator end() noexcept {
return _List.end();
}
_NODISCARD const_iterator end() const noexcept {
return _List.end();
}
_Unchecked_iterator _Unchecked_begin() noexcept {
return _List._Unchecked_begin();
}
_Unchecked_const_iterator _Unchecked_begin() const noexcept {
return _List._Unchecked_begin();
}
_Unchecked_iterator _Unchecked_end() noexcept {
return _List._Unchecked_end();
}
_Unchecked_const_iterator _Unchecked_end() const noexcept {
return _List._Unchecked_end();
}
_NODISCARD const_iterator cbegin() const noexcept {
return begin();
}
_NODISCARD const_iterator cend() const noexcept {
return end();
}
_NODISCARD size_type size() const noexcept {
return _List.size();
}
_NODISCARD size_type max_size() const noexcept {
return _List.max_size();
}
_NODISCARD bool empty() const noexcept {
return _List.empty();
}
_NODISCARD allocator_type get_allocator() const noexcept {
return static_cast<allocator_type>(_List.get_allocator());
}
using local_iterator = iterator;
using const_local_iterator = const_iterator;
_NODISCARD size_type bucket_count() const noexcept {
return _Maxidx;
}
_NODISCARD size_type max_bucket_count() const noexcept {
return _Vec.max_size() >> 1;
}
_NODISCARD size_type bucket(const key_type& _Keyval) const
noexcept(_Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _Traitsobj(_Keyval) & _Mask;
}
_NODISCARD size_type bucket_size(size_type _Bucket) const noexcept /* strengthened */ {
_Unchecked_iterator _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
if (_Bucket_lo == _Unchecked_end()) {
return 0;
}
return static_cast<size_type>(_STD distance(_Bucket_lo, _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1])) + 1;
}
_NODISCARD local_iterator begin(size_type _Bucket) noexcept /* strengthened */ {
return _List._Make_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD const_local_iterator begin(size_type _Bucket) const noexcept /* strengthened */ {
return _List._Make_const_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD local_iterator end(size_type _Bucket) noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List._Mypair._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_iter(_Bucket_hi);
}
_NODISCARD const_local_iterator end(size_type _Bucket) const noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List._Mypair._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_const_iter(_Bucket_hi);
}
_NODISCARD const_local_iterator cbegin(size_type _Bucket) const noexcept /* strengthened */ {
return _List._Make_const_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD const_local_iterator cend(size_type _Bucket) const noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List._Mypair._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_const_iter(_Bucket_hi);
}
_NODISCARD float load_factor() const noexcept {
return static_cast<float>(size()) / static_cast<float>(bucket_count());
}
_NODISCARD float max_load_factor() const noexcept {
return _Max_bucket_size();
}
void max_load_factor(float _Newmax) noexcept /* strengthened */ {
_STL_ASSERT(!(_CSTD isnan)(_Newmax) && _Newmax > 0, "invalid hash load factor");
_Max_bucket_size() = _Newmax;
}
void rehash(size_type _Buckets) { // rebuild table with at least _Buckets buckets
// don't violate a.bucket_count() >= a.size() / a.max_load_factor() invariant:
_Buckets = (_STD max)(_Min_load_factor_buckets(_List.size()), _Buckets);
if (_Buckets <= _Maxidx) { // we already have enough buckets; nothing to do
return;
}
_Forced_rehash(_Buckets);
}
void reserve(size_type _Maxcount) { // rebuild table with room for _Maxcount elements
rehash(static_cast<size_type>(static_cast<float>(_Maxcount) / max_load_factor() + 0.5F));
}
conditional_t<_Multi, iterator, pair<iterator, bool>> insert(const value_type& _Val) {
return emplace(_Val);
}
conditional_t<_Multi, iterator, pair<iterator, bool>> insert(value_type&& _Val) {
return emplace(_STD move(_Val));
}
iterator insert(const_iterator _Hint, const value_type& _Val) {
return emplace_hint(_Hint, _Val);
}
iterator insert(const_iterator _Hint, value_type&& _Val) {
return emplace_hint(_Hint, _STD move(_Val));
}
template <class _Iter>
void insert(_Iter _First, _Iter _Last) {
_Adl_verify_range(_First, _Last);
auto _UFirst = _Get_unwrapped(_First);
const auto _ULast = _Get_unwrapped(_Last);
for (; _UFirst != _ULast; ++_UFirst) {
emplace(*_UFirst);
}
}
void insert(initializer_list<value_type> _Ilist) {
insert(_Ilist.begin(), _Ilist.end());
}
private:
_Nodeptr _Unchecked_erase(_Nodeptr _Plist) noexcept(_Nothrow_hash<_Traits, key_type>) {
size_type _Bucket = bucket(_Traits::_Kfn(_Plist->_Myval));
_Erase_bucket(_Plist, _Bucket);
return _List._Unchecked_erase(_Plist);
}
struct _Range_eraser {
_Range_eraser(const _Range_eraser&) = delete;
_Range_eraser& operator=(const _Range_eraser&) = delete;
#if _ITERATOR_DEBUG_LEVEL == 2
// Keep the list nodes around until we have found all those we will erase, for an O(iterators + erasures) update
// of the iterator chain.
_Range_eraser(_Mylist& _List_, const _Nodeptr _First_) noexcept
: _List(_List_), _First(_First_), _Next(_First_) {}
void _Bump_erased() noexcept {
_Next = _Next->_Next;
}
~_Range_eraser() noexcept {
_List._Unchecked_erase(_First, _Next);
}
_Mylist& _List;
const _Nodeptr _First;
_Nodeptr _Next;
#else // ^^^ _ITERATOR_DEBUG_LEVEL == 2 // _ITERATOR_DEBUG_LEVEL != 2 vvv
// Destroy the nodes as we encounter them to avoid a second traversal of the linked list.
_Range_eraser(_Mylist& _List_, const _Nodeptr _First_) noexcept
: _List(_List_), _Predecessor(_First_->_Prev), _Next(_First_) {}
void _Bump_erased() noexcept {
const auto _Oldnext = _Next;
_Next = _Oldnext->_Next;
_Node::_Freenode(_List._Getal(), _Oldnext);
--_List._Mypair._Myval2._Mysize;
}
~_Range_eraser() noexcept {
_Predecessor->_Next = _Next;
_Next->_Prev = _Predecessor;
}
_Mylist& _List;
const _Nodeptr _Predecessor;
_Nodeptr _Next;
#endif
};
_Nodeptr _Unchecked_erase(_Nodeptr _First, const _Nodeptr _Last) noexcept(_Nothrow_hash<_Traits, key_type>) {
if (_First == _Last) {
return _Last;
}
const auto _End = _List._Mypair._Myval2._Myhead;
const auto _Bucket_bounds = _Vec._Mypair._Myval2._Myfirst;
_Range_eraser _Eraser{_List, _First};
{
// process the first bucket, which is special because here _First might not be the beginning of the bucket
const auto _Predecessor = _First->_Prev;
const size_type _Bucket = bucket(_Traits::_Kfn(_Eraser._Next->_Myval)); // throws
// nothrow hereafter this block
_Nodeptr& _Bucket_lo = _Bucket_bounds[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Bucket_bounds[(_Bucket << 1) + 1]._Ptr;
const bool _Update_lo = _Bucket_lo == _Eraser._Next;
const _Nodeptr _Old_hi = _Bucket_hi;
for (;;) { // remove elements until we hit the end of the bucket
const bool _At_bucket_back = _Eraser._Next == _Old_hi;
_Eraser._Bump_erased();
if (_At_bucket_back) {
break;
}
if (_Eraser._Next == _Last) {
if (_Update_lo) {
// erased the bucket's prefix
_Bucket_lo = _Eraser._Next;
}
return _Last;
}
}
if (_Update_lo) {
// emptied the bucket
_Bucket_lo = _End;
_Bucket_hi = _End;
} else {
_Bucket_hi = _Predecessor;
}
}
// hereafter we are always erasing buckets' prefixes
while (_Eraser._Next != _Last) {
const size_type _Bucket = bucket(_Traits::_Kfn(_Eraser._Next->_Myval)); // throws
// nothrow hereafter this block
_Nodeptr& _Bucket_lo = _Bucket_bounds[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Bucket_bounds[(_Bucket << 1) + 1]._Ptr;
const _Nodeptr _Old_hi = _Bucket_hi;
for (;;) { // remove elements until we hit the end of the bucket
const bool _At_bucket_back = _Eraser._Next == _Old_hi;
_Eraser._Bump_erased();
if (_At_bucket_back) {
break;
}
if (_Eraser._Next == _Last) {
// erased the bucket's prefix
_Bucket_lo = _Eraser._Next;
return _Last;
}
}
// emptied the bucket
_Bucket_lo = _End;
_Bucket_hi = _End;
}
return _Last;
}
public:
template <class _Iter = iterator, enable_if_t<!is_same_v<_Iter, const_iterator>, int> = 0>
iterator erase(iterator _Plist) noexcept(_Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_Plist._Ptr));
}
iterator erase(const_iterator _Plist) noexcept(_Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_Plist._Ptr));
}
iterator erase(const_iterator _First, const_iterator _Last) noexcept(
_Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_First._Ptr, _Last._Ptr));
}
size_type erase(const key_type& _Keyval) noexcept(
_Nothrow_hash<_Traits, key_type> //
&& (!_Multi || _Nothrow_compare<_Traits, key_type, key_type>) ) /* strengthened */ {
const size_t _Hashval = _Traitsobj(_Keyval);
if _CONSTEXPR_IF (_Multi) {
const auto _Where = _Equal_range(_Keyval, _Hashval);
_Unchecked_erase(_Where._First._Ptr, _Where._Last._Ptr);
return _Where._Distance;
} else {
const auto _Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target) {
_Erase_bucket(_Target, _Hashval & _Mask);
_List._Unchecked_erase(_Target);
return 1;
}
return 0;
}
}
void clear() noexcept {
// TRANSITION, ABI:
// LWG-2550 requires implementations to make clear() O(size()), independent of bucket_count().
// Unfortunately our current data structure / ABI does not allow achieving this in the general case because:
// (1) Finding the bucket that goes with an element requires running the hash function
// (2) The hash function operator() may throw exceptions, and
// (3) clear() is a noexcept function.
// We do comply with LWG-2550 if the hash function is noexcept, or if the container was empty.
const auto _Oldsize = _List._Mypair._Myval2._Mysize;
if (_Oldsize == 0) {
return;
}
if _CONSTEXPR_IF (_Nothrow_hash<_Traits, key_type>) {
// In testing, hash<size_t>{}(size_t{}) takes about 14 times as much time as assigning a pointer, or
// ~7-8 times as much as clearing a bucket. Therefore, if we would need to assign over more than 8 times
// as many buckets as elements, remove element-by-element.
if (bucket_count() / 8 > _Oldsize) {
const auto _Head = _List._Mypair._Myval2._Myhead;
_Unchecked_erase(_Head->_Next, _Head);
return;
}
}
// Bulk destroy items and reset buckets
_List.clear();
_STD fill(_Vec._Mypair._Myval2._Myfirst, _Vec._Mypair._Myval2._Mylast, _Unchecked_end());
}
private:
template <class _Keyty>
_NODISCARD _Nodeptr _Find_first(const _Keyty& _Keyval, const size_t _Hashval) const {
// find node pointer to first node matching _Keyval (with hash _Hashval) if it exists; otherwise, end
const size_type _Bucket = _Hashval & _Mask;
_Nodeptr _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
const _Nodeptr _End = _List._Mypair._Myval2._Myhead;
if (_Where == _End) {
return _End;
}
const _Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
for (;;) {
if (!_Traitsobj(_Traits::_Kfn(_Where->_Myval), _Keyval)) {
if _CONSTEXPR_IF (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(_Where->_Myval))) {
return _End;
}
}
return _Where;
}
if (_Where == _Bucket_hi) {
return _End;
}
_Where = _Where->_Next;
}
}
template <class _Keyty>
_Nodeptr _Find(const _Keyty& _Keyval, const size_t _Hashval) const {
if _CONSTEXPR_IF (_Traits::_Multi) {
return _Find_first(_Keyval, _Hashval);
} else {
// use _Find_last for unique containers to avoid increase in code size of instantiating _Find_first
auto _Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target) {
return _Target;
}
return _List._Mypair._Myval2._Myhead;
}
}
public:
template <class _Keyty = void>
_NODISCARD iterator find(typename _Traits::template _Deduce_key<_Keyty> _Keyval) {
return _List._Make_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
template <class _Keyty = void>
_NODISCARD const_iterator find(typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
return _List._Make_const_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
#if _HAS_CXX20
template <class _Keyty = void>
_NODISCARD bool contains(typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
return static_cast<bool>(_Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate);
}
#endif // _HAS_CXX20
template <class _Keyty = void>
_NODISCARD size_type count(typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
const size_t _Hashval = _Traitsobj(_Keyval);
if _CONSTEXPR_IF (_Multi) {
return _Equal_range(_Keyval, _Hashval)._Distance;
} else {
return static_cast<bool>(_Find_last(_Keyval, _Hashval)._Duplicate);
}
}
_DEPRECATE_STDEXT_HASH_LOWER_BOUND _NODISCARD iterator lower_bound(const key_type& _Keyval) {
return _List._Make_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
_DEPRECATE_STDEXT_HASH_LOWER_BOUND _NODISCARD const_iterator lower_bound(const key_type& _Keyval) const {
return _List._Make_const_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
_DEPRECATE_STDEXT_HASH_UPPER_BOUND _NODISCARD iterator upper_bound(const key_type& _Keyval) {
auto _Target = _Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate;
if (_Target) {
_Target = _Target->_Next;
} else {
_Target = _List._Mypair._Myval2._Myhead;
}
return _List._Make_iter(_Target);
}
_DEPRECATE_STDEXT_HASH_UPPER_BOUND _NODISCARD const_iterator upper_bound(const key_type& _Keyval) const {
auto _Target = _Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate;
if (_Target) {
_Target = _Target->_Next;
} else {
_Target = _List._Mypair._Myval2._Myhead;
}
return _List._Make_const_iter(_Target);
}
private:
struct _Equal_range_result {
_Unchecked_const_iterator _First;
_Unchecked_const_iterator _Last;
size_type _Distance;
};
template <class _Keyty>
_NODISCARD _Equal_range_result _Equal_range(const _Keyty& _Keyval, const size_t _Hashval) const
noexcept(_Nothrow_compare<_Traits, key_type, _Keyty>&& _Nothrow_compare<_Traits, _Keyty, key_type>) {
const size_type _Bucket = _Hashval & _Mask;
_Unchecked_const_iterator _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
const _Unchecked_const_iterator _End = _Unchecked_end();
if (_Where == _End) {
return {_End, _End, 0};
}
const _Unchecked_const_iterator _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
for (; _Traitsobj(_Traits::_Kfn(*_Where), _Keyval); ++_Where) {
if (_Where == _Bucket_hi) {
return {_End, _End, 0};
}
}
if _CONSTEXPR_IF (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(*_Where))) {
return {_End, _End, 0};
}
}
const _Unchecked_const_iterator _First = _Where;
if _CONSTEXPR_IF (_Multi) {
size_type _Distance = 0;
for (;;) {
++_Distance;
const bool _At_bucket_end = _Where == _Bucket_hi;
++_Where;
if (_At_bucket_end) {
break;
}
if (_Traitsobj(_Keyval, _Traits::_Kfn(*_Where))) {
break;
}
}
return {_First, _Where, _Distance};
} else {
++_Where; // found the unique element
return {_First, _Where, 1};
}
}
public:
template <class _Keyty = void>
_NODISCARD pair<iterator, iterator> equal_range(typename _Traits::template _Deduce_key<_Keyty> _Keyval) {
const auto _Result = _Equal_range(_Keyval, _Traitsobj(_Keyval));
return {_List._Make_iter(_Result._First._Ptr), _List._Make_iter(_Result._Last._Ptr)};
}
template <class _Keyty = void>
_NODISCARD pair<const_iterator, const_iterator> equal_range(
typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
const auto _Result = _Equal_range(_Keyval, _Traitsobj(_Keyval));
return {_List._Make_const_iter(_Result._First._Ptr), _List._Make_const_iter(_Result._Last._Ptr)};
}
void swap(_Hash& _Right) noexcept(noexcept(_Traitsobj.swap(_Right._Traitsobj))) /* strengthened */ {
if (this != _STD addressof(_Right)) {
_Traitsobj.swap(_Right._Traitsobj);
_Pocs(_List._Getal(), _Right._List._Getal());
_Pocs(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
_Swap_val(_Right);
}
}
#if _HAS_CXX17
using node_type = typename _Traits::node_type;
node_type extract(const const_iterator _Where) {
#if _ITERATOR_DEBUG_LEVEL == 2
const auto _List_data = _STD addressof(_List._Mypair._Myval2);
_STL_VERIFY(_Where._Getcont() == _List_data, "extract mismatched container");
_STL_VERIFY(_Where._Ptr != _List_data->_Myhead, "cannot extract end()");
#endif // _ITERATOR_DEBUG_LEVEL == 2
return node_type::_Make(_Extract(_Where._Unwrapped()), _List._Getal());
}
node_type extract(const key_type& _Keyval) {
const auto _Ptr = _Extract(_Keyval);
if (!_Ptr) {
return node_type{};
}
return node_type::_Make(_Ptr, _List._Getal());
}
iterator insert(const_iterator _Hint, node_type&& _Handle) {
if (_Handle.empty()) {
return end();
}
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_List.get_allocator() == _Handle._Getal(), "node handle allocator incompatible for insert");
#endif // _ITERATOR_DEBUG_LEVEL == 2
const auto& _Keyval = _Traits::_Kfn(_Handle._Getptr()->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
}
const auto _Released = _Handle._Release();
_Destroy_in_place(_Released->_Next); // TRANSITION, ABI
_Destroy_in_place(_Released->_Prev);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Released));
}
template <class>
friend class _Hash;
template <class _Other_traits>
void merge(_Hash<_Other_traits>& _That) { // transfer all nodes from _That into *this
static_assert(is_same_v<_Nodeptr, typename _Hash<_Other_traits>::_Nodeptr>,
"merge() requires an argument with a compatible node type.");
static_assert(is_same_v<allocator_type, typename _Hash<_Other_traits>::allocator_type>,
"merge() requires an argument with the same allocator type.");
if constexpr (is_same_v<_Hash, _Hash<_Other_traits>>) {
if (this == _STD addressof(_That)) {
return;
}
}
#if _ITERATOR_DEBUG_LEVEL == 2
if constexpr (!_Alnode_traits::is_always_equal::value) {
_STL_VERIFY(_List._Getal() == _That._List._Getal(), "allocator incompatible for merge");
}
#endif // _ITERATOR_DEBUG_LEVEL == 2
auto _First = _That._Unchecked_begin();
const auto _Last = _That._Unchecked_end();
while (_First != _Last) {
const auto _Candidate = _First._Ptr;
++_First;
const auto& _Keyval = _Traits::_Kfn(_Candidate->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
continue;
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Keyval, _Hashval);
}
// nothrow hereafter this iteration
const auto _Source_bucket = _Hashval & _That._Mask;
_That._Erase_bucket(_Candidate, _Source_bucket);
_Candidate->_Prev->_Next = _Candidate->_Next;
_Candidate->_Next->_Prev = _Candidate->_Prev;
--_That._List._Mypair._Myval2._Mysize;
_Destroy_in_place(_Candidate->_Next); // TRANSITION, ABI
_Destroy_in_place(_Candidate->_Prev);
#if _ITERATOR_DEBUG_LEVEL == 2
_List._Mypair._Myval2._Adopt_unique(_That._List._Mypair._Myval2, _Candidate);
#endif // _ITERATOR_DEBUG_LEVEL == 2
(void) _Insert_new_node_before(_Hashval, _Target._Insert_before, _Candidate);
}
}
template <class _Other_traits>
void merge(_Hash<_Other_traits>&& _That) { // transfer all nodes from _That into *this
static_assert(is_same_v<_Nodeptr, typename _Hash<_Other_traits>::_Nodeptr>,
"merge() requires an argument with a compatible node type.");
static_assert(is_same_v<allocator_type, typename _Hash<_Other_traits>::allocator_type>,
"merge() requires an argument with the same allocator type.");
merge(_That);
}
protected:
_Nodeptr _Extract(const _Unchecked_const_iterator _Where) {
const size_type _Bucket = bucket(_Traits::_Kfn(*_Where));
_Erase_bucket(_Where._Ptr, _Bucket);
return _List._Mypair._Myval2._Unlinknode(_Where._Ptr);
}
_Nodeptr _Extract(const key_type& _Keyval) {
const size_t _Hashval = _Traitsobj(_Keyval);
_Nodeptr _Target;
if constexpr (_Traits::_Multi) {
_Target = _Find_first(_Keyval, _Hashval);
if (_Target == _List._Mypair._Myval2._Myhead) {
return _Nodeptr{};
}
} else {
_Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target == nullptr) {
return _Nodeptr{};
}
}
_Erase_bucket(_Target, _Hashval & _Mask);
return _List._Mypair._Myval2._Unlinknode(_Target);
}
public:
conditional_t<_Traits::_Multi, iterator, _Insert_return_type<iterator, node_type>> insert(node_type&& _Handle) {
// insert the node (if any) held in _Handle
if (_Handle.empty()) {
if constexpr (_Traits::_Multi) {
return end();
} else {
return {end(), false, _STD move(_Handle)};
}
}
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_List.get_allocator() == _Handle._Getal(), "node handle allocator incompatible for insert");
#endif // _ITERATOR_DEBUG_LEVEL == 2
const auto& _Keyval = _Traits::_Kfn(_Handle._Getptr()->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false, _STD move(_Handle)};
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Keyval, _Hashval);
}
const auto _Released = _Handle._Release();
_Destroy_in_place(_Released->_Next); // TRANSITION, ABI
_Destroy_in_place(_Released->_Prev);
const auto _Newnode = _Insert_new_node_before(_Hashval, _Target._Insert_before, _Released);
if constexpr (_Traits::_Multi) {
return _List._Make_iter(_Newnode);
} else {
return {_List._Make_iter(_Newnode), true, node_type{}};
}
}
#endif // _HAS_CXX17
protected:
template <class _Keyty>
_NODISCARD _Hash_find_last_result<_Nodeptr> _Find_last(const _Keyty& _Keyval, const size_t _Hashval) const {
// find the insertion point for _Keyval and whether an element identical to _Keyval is already in the container
const size_type _Bucket = _Hashval & _Mask;
_Nodeptr _Where = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
const _Nodeptr _End = _List._Mypair._Myval2._Myhead;
if (_Where == _End) {
return {_End, _Nodeptr{}};
}
const _Nodeptr _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
for (;;) {
// Search backwards to maintain sorted [_Bucket_lo, _Bucket_hi] when !_Standard
if (!_Traitsobj(_Keyval, _Traits::_Kfn(_Where->_Myval))) {
if _CONSTEXPR_IF (!_Traits::_Standard) {
if (_Traitsobj(_Traits::_Kfn(_Where->_Myval), _Keyval)) {
return {_Where->_Next, _Nodeptr{}};
}
}
return {_Where->_Next, _Where};
}
if (_Where == _Bucket_lo) {
return {_Where, _Nodeptr{}};
}
_Where = _Where->_Prev;
}
}
template <class _Keyty>
_NODISCARD _Hash_find_last_result<_Nodeptr> _Find_hint(
const _Nodeptr _Hint, const _Keyty& _Keyval, const size_t _Hashval) const {
// if _Hint points to an element equivalent to _Keyval, returns _Hint; otherwise,
// returns _Find_last(_Keyval, _Hashval)
if (_Hint != _List._Mypair._Myval2._Myhead && !_Traitsobj(_Traits::_Kfn(_Hint->_Myval), _Keyval)) {
if _CONSTEXPR_IF (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(_Hint->_Myval))) {
return _Find_last(_Keyval, _Hashval);
}
}
return {_Hint->_Next, _Hint};
}
return _Find_last(_Keyval, _Hashval);
}
_Nodeptr _Insert_new_node_before(
const size_t _Hashval, const _Nodeptr _Insert_before, const _Nodeptr _Newnode) noexcept {
const _Nodeptr _Insert_after = _Insert_before->_Prev;
++_List._Mypair._Myval2._Mysize;
_Construct_in_place(_Newnode->_Next, _Insert_before);
_Construct_in_place(_Newnode->_Prev, _Insert_after);
_Insert_after->_Next = _Newnode;
_Insert_before->_Prev = _Newnode;
const auto _Head = _List._Mypair._Myval2._Myhead;
const auto _Bucket_array = _Vec._Mypair._Myval2._Myfirst;
const size_type _Bucket = _Hashval & _Mask;
_Unchecked_iterator& _Bucket_lo = _Bucket_array[_Bucket << 1];
_Unchecked_iterator& _Bucket_hi = _Bucket_array[(_Bucket << 1) + 1];
if (_Bucket_lo._Ptr == _Head) {
// bucket is empty, set both
_Bucket_lo._Ptr = _Newnode;
_Bucket_hi._Ptr = _Newnode;
} else if (_Bucket_lo._Ptr == _Insert_before) {
// new node is the lowest element in the bucket
_Bucket_lo._Ptr = _Newnode;
} else if (_Bucket_hi._Ptr == _Insert_after) {
// new node is the highest element in the bucket
_Bucket_hi._Ptr = _Newnode;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
return _Newnode;
}
void _Check_max_size() const {
const size_type _Oldsize = _List._Mypair._Myval2._Mysize;
if (_Oldsize == _List.max_size()) {
_Xlength_error("unordered_map/set too long");
}
}
bool _Check_rehash_required_1() const noexcept {
const size_type _Oldsize = _List._Mypair._Myval2._Mysize;
const auto _Newsize = _Oldsize + 1;
return max_load_factor() < static_cast<float>(_Newsize) / static_cast<float>(bucket_count());
}
void _Rehash_for_1() {
const auto _Oldsize = _List._Mypair._Myval2._Mysize;
const auto _Newsize = _Oldsize + 1;
_Forced_rehash(_Desired_grow_bucket_count(_Newsize));
}
void _Erase_bucket(_Nodeptr _Plist, size_type _Bucket) noexcept {
// remove the node _Plist from its bucket
_Nodeptr& _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi == _Plist) {
if (_Bucket_lo == _Plist) { // make bucket empty
const auto _End = _List._Mypair._Myval2._Myhead;
_Bucket_lo = _End;
_Bucket_hi = _End;
} else {
_Bucket_hi = _Plist->_Prev; // move end back one element
}
} else if (_Bucket_lo == _Plist) {
_Bucket_lo = _Plist->_Next; // move beginning up one element
}
}
_NODISCARD size_type _Min_load_factor_buckets(const size_type _For_size) const noexcept {
// returns the minimum number of buckets necessary for the elements in _List
return static_cast<size_type>(_CSTD ceilf(static_cast<float>(_For_size) / max_load_factor()));
}
_NODISCARD size_type _Desired_grow_bucket_count(const size_type _For_size) const noexcept {
const size_type _Old_buckets = bucket_count();
const size_type _Req_buckets = (_STD max)(_Min_buckets, _Min_load_factor_buckets(_For_size));
if (_Old_buckets >= _Req_buckets) {
// we already have enough buckets so there's no need to change the count
return _Old_buckets;
}
if (_Old_buckets < 512 && _Old_buckets * 8 >= _Req_buckets) {
// if we are changing the bucket count and have less than 512 buckets, use 8x more buckets
return _Old_buckets * 8;
}
// power of 2 invariant means this will result in at least 2*_Old_buckets after round up in _Forced_rehash
return _Req_buckets;
}
void _Reinsert_with_invalid_vec() { // insert elements in [begin(), end()), distrusting existing _Vec elements
_Forced_rehash(_Desired_grow_bucket_count(_List.size()));
}
void _Forced_rehash(size_type _Buckets) {
// Force rehash of elements in _List, distrusting existing bucket assignments in _Vec.
// Assumes _Buckets is greater than _Min_buckets, and that changing to that many buckets doesn't violate
// load_factor() <= max_load_factor().
// Don't violate power of 2, fits in half the bucket vector invariant:
// (we assume because vector must use single allocations; as a result, its max_size fits in a size_t)
const unsigned long _Max_storage_buckets_log2 = _Floor_of_log_2(static_cast<size_t>(_Vec.max_size() >> 1));
const auto _Max_storage_buckets = static_cast<size_type>(1) << _Max_storage_buckets_log2;
if (_Buckets > _Max_storage_buckets) {
_Xlength_error("invalid hash bucket count");
}
// The above test also means that we won't perform a forbidden full shift when restoring the power of
// 2 invariant
// this round up to power of 2 in addition to the _Buckets > _Maxidx above means
// we'll at least double in size (the next power of 2 above _Maxidx)
_Buckets = static_cast<size_type>(1) << _Ceiling_of_log_2(static_cast<size_t>(_Buckets));
const _Unchecked_iterator _End = _Unchecked_end();
_Vec._Assign_grow(_Buckets << 1, _End);
_Mask = _Buckets - 1;
_Maxidx = _Buckets;
_Clear_guard _Guard{this};
_Unchecked_iterator _Inserted = _Unchecked_begin();
// Remember the next _Inserted value as splices will change _Inserted's position arbitrarily.
for (_Unchecked_iterator _Next_inserted = _Inserted; _Inserted != _End; _Inserted = _Next_inserted) {
++_Next_inserted;
auto& _Inserted_key = _Traits::_Kfn(*_Inserted);
const size_type _Bucket = bucket(_Inserted_key);
// _Bucket_lo and _Bucket_hi are the *inclusive* range of elements in the bucket, or _Unchecked_end() if
// the bucket is empty; if !_Standard then [_Bucket_lo, _Bucket_hi] is a sorted range.
_Unchecked_iterator& _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
_Unchecked_iterator& _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
if (_Bucket_lo == _End) {
// The bucket was empty, set it to the inserted element.
_Bucket_lo = _Inserted;
_Bucket_hi = _Inserted;
continue;
}
// Search the bucket for the insertion location and move element if necessary.
_Unchecked_const_iterator _Insert_before = _Bucket_hi;
if (!_Traitsobj(_Inserted_key, _Traits::_Kfn(*_Insert_before))) {
// The inserted element belongs at the end of the bucket; splice it there and set _Bucket_hi to the
// new bucket inclusive end.
++_Insert_before;
if (_Insert_before != _Inserted) { // avoid splice on element already in position
_Mylist::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
}
_Bucket_hi = _Inserted;
continue;
}
// The insertion point isn't *_Bucket_hi, so search [_Bucket_lo, _Bucket_hi) for insertion point; we
// go backwards to maintain sortedness when !_Standard.
for (;;) {
if (_Bucket_lo == _Insert_before) {
// There are no equivalent keys in the bucket, so insert it at the beginning.
// Element can't be already in position here because:
// * (for !_Standard) _Inserted_key < *_Insert_before or
// * (for _Standard) _Inserted_key != *_Insert_before
_Mylist::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
_Bucket_lo = _Inserted;
break;
}
if (!_Traitsobj(_Inserted_key, _Traits::_Kfn(*--_Insert_before))) {
// Found insertion point, move the element here, bucket bounds are already okay.
++_Insert_before;
// Element can't be already in position here because all elements we're inserting are after all
// the elements already in buckets, and *_Insert_before isn't the highest element in the bucket.
_Mylist::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
break;
}
}
}
_Guard._Target = nullptr;
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
float& _Max_bucket_size() noexcept {
return _Traitsobj._Get_max_bucket_size();
}
const float& _Max_bucket_size() const noexcept {
return _Traitsobj._Get_max_bucket_size();
}
_Alnode& _Getal() noexcept {
return _List._Getal();
}
const _Alnode& _Getal() const noexcept {
return _List._Getal();
}
struct _Multi_equal_check_result {
bool _Equal_possible = false;
_Unchecked_const_iterator _Subsequent_first{}; // only useful if _Equal_possible
};
_NODISCARD _Multi_equal_check_result _Multi_equal_check_equal_range(
const _Hash& _Right, _Unchecked_const_iterator _First1) const {
// check that an equal_range of elements starting with *_First1 are a permutation of the corresponding
// equal_range of elements in _Right
auto& _Keyval = _Traits::_Kfn(*_First1);
// find the start of the matching run in the other container
const size_t _Hashval = _Right._Traitsobj(_Keyval);
const size_type _Bucket = _Hashval & _Right._Mask;
auto _First2 = _Right._Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
if (_First2 == _Right._Unchecked_end()) {
// no matching bucket, therefore no matching run
return {};
}
const auto _Bucket_hi = _Right._Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
for (; _Right._Traitsobj(_Traits::_Kfn(*_First2), _Keyval); ++_First2) {
// find first matching element in _Right
if (_First2 == _Bucket_hi) {
return {};
}
}
_Unchecked_const_iterator _Left_stop_at;
if _CONSTEXPR_IF (_Traits::_Standard) {
_Left_stop_at = _Unchecked_end();
} else {
// check the first elements for equivalence when !_Standard
if (_Right._Traitsobj(_Keyval, _Traits::_Kfn(*_First2))) {
return {};
}
const size_t _LHashval = _Traitsobj(_Keyval);
const size_type _LBucket = _LHashval & _Mask;
const auto _LBucket_hi = _Vec._Mypair._Myval2._Myfirst[(_LBucket << 1) + 1];
_Left_stop_at = _LBucket_hi;
++_Left_stop_at;
}
// trim matching prefixes
while (*_First1 == *_First2) {
// the right equal_range ends at the end of the bucket or on the first nonequal element
bool _Right_range_end = _First2 == _Bucket_hi;
++_First2;
if (!_Right_range_end) {
_Right_range_end = _Right._Traitsobj(_Keyval, _Traits::_Kfn(*_First2));
}
// the left equal_range ends at the end of the container or on the first nonequal element
++_First1;
const bool _Left_range_end = _First1 == _Left_stop_at || _Traitsobj(_Keyval, _Traits::_Kfn(*_First1));
if (_Left_range_end && _Right_range_end) {
// the equal_ranges were completely equal
return {true, _First1};
}
if (_Left_range_end || _Right_range_end) {
// one equal_range is a prefix of the other; not equal
return {};
}
}
// found a mismatched element, find the end of the equal_ranges and dispatch to _Check_match_counts
auto _Last1 = _First1;
auto _Last2 = _First2;
for (;;) {
bool _Right_range_end = _Last2 == _Bucket_hi;
++_Last2;
if (!_Right_range_end) {
_Right_range_end = _Right._Traitsobj(_Keyval, _Traits::_Kfn(*_Last2));
}
++_Last1;
const bool _Left_range_end = _Last1 == _Left_stop_at || _Traitsobj(_Keyval, _Traits::_Kfn(*_Last1));
if (_Left_range_end && _Right_range_end) {
// equal_ranges had the same length, check for permutation
return {_Check_match_counts(_First1, _Last1, _First2, _Last2, equal_to<>{}), _Last1};
}
if (_Left_range_end || _Right_range_end) {
// different number of elements in the range, not a permutation
return {};
}
}
}
_NODISCARD bool _Multi_equal(const _Hash& _Right) const {
static_assert(_Traits::_Multi, "This function only works with multi containers");
_STL_INTERNAL_CHECK(this->size() == _Right.size());
const auto _Last1 = _Unchecked_end();
auto _First1 = _Unchecked_begin();
while (_First1 != _Last1) {
const auto _Result = _Multi_equal_check_equal_range(_Right, _First1);
if (!_Result._Equal_possible) {
return false;
}
_First1 = _Result._Subsequent_first;
}
return true;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
public:
void _Stl_internal_check_container_invariants() const noexcept {
const size_type _Vecsize = _Vec.size();
_STL_INTERNAL_CHECK(_Vec._Mypair._Myval2._Mylast == _Vec._Mypair._Myval2._Myend);
_STL_INTERNAL_CHECK(_Vecsize >= _Min_buckets * 2);
_STL_INTERNAL_CHECK(_Maxidx == (_Vecsize >> 1));
_STL_INTERNAL_CHECK(_Maxidx - 1 == _Mask);
_STL_INTERNAL_CHECK(_Maxidx >= _Min_load_factor_buckets(_List.size()));
// asserts that bucket count is a power of 2:
_STL_INTERNAL_CHECK((static_cast<size_type>(1) << _Floor_of_log_2(_Vecsize)) == _Vecsize);
_STL_INTERNAL_CHECK(load_factor() <= max_load_factor());
// In the test that counts number of allocator copies, avoid an extra rebind that would incorrectly count as
// a copy; otherwise, allow allocators that support only homogeneous compare.
#ifdef _USE_HETEROGENEOUS_ALLOCATOR_COMPARE_IN_INTERNAL_CHECK
_STL_INTERNAL_CHECK(_List._Getal() == _Vec._Mypair._Get_first());
#else // _USE_HETEROGENEOUS_ALLOCATOR_COMPARE_IN_INTERNAL_CHECK
_STL_INTERNAL_CHECK(static_cast<_Aliter>(_List._Getal()) == _Vec._Mypair._Get_first());
#endif // _USE_HETEROGENEOUS_ALLOCATOR_COMPARE_IN_INTERNAL_CHECK
#ifdef _STL_INTERNAL_CHECK_EXHAUSTIVE
size_type _Elements = 0;
const auto _End = _Unchecked_end();
for (size_type _Bucket = 0; _Bucket < _Maxidx; ++_Bucket) {
_Unchecked_const_iterator _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
const _Unchecked_const_iterator _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
if (_Where != _End) {
// check that the bucket is sorted for legacy hash_meow:
if _CONSTEXPR_IF (!_Traits::_Standard) {
if (_Where != _Bucket_hi) {
auto _SFirst = _Where;
auto _SNext = _Where;
for (;;) {
++_SNext;
if _CONSTEXPR_IF (_Traits::_Multi) {
_STL_INTERNAL_CHECK(!_Traitsobj(_Traits::_Kfn(*_SNext), _Traits::_Kfn(*_SFirst)));
} else {
_STL_INTERNAL_CHECK(_Traitsobj(_Traits::_Kfn(*_SFirst), _Traits::_Kfn(*_SNext)));
}
if (_SNext == _Bucket_hi) {
break;
}
_SFirst = _SNext;
}
}
}
// check that all the elements in the bucket belong in the bucket:
for (;;) {
++_Elements;
_STL_INTERNAL_CHECK(bucket(_Traits::_Kfn(*_Where)) == _Bucket);
if (_Where == _Bucket_hi) {
break;
}
++_Where;
}
}
}
_STL_INTERNAL_CHECK(_List.size() == _Elements);
#endif // _STL_INTERNAL_CHECK_EXHAUSTIVE
}
protected:
#endif // _ENABLE_STL_INTERNAL_CHECK
_Traits _Traitsobj; // traits to customize behavior
_Mylist _List; // list of elements, must initialize before _Vec
_Hash_vec<_Aliter> _Vec; // "vector" of list iterators for buckets:
// each bucket is 2 iterators denoting the closed range of elements in the bucket,
// or both iterators set to _Unchecked_end() if the bucket is empty.
size_type _Mask; // the key mask
size_type _Maxidx; // current maximum key value, must be a power of 2
};
#if _HAS_CXX17
// ALIAS TEMPLATE _Is_hasher FOR CONSTRAINING DEDUCTION GUIDES, N4687 26.2.7 [unord.req]/17.3
template <class _Hasher>
using _Is_hasher = negation<disjunction<is_integral<_Hasher>, _Is_allocator<_Hasher>>>;
#endif // _HAS_CXX17
#if !_HAS_IF_CONSTEXPR
template <class _Traits>
_NODISCARD bool _Hash_equal_elements(const _Hash<_Traits>& _Left, const _Hash<_Traits>& _Right, false_type) {
for (const auto& _LVal : _Left) {
// look for element with equivalent key
const auto& _Keyval = _Traits::_Kfn(_LVal);
const auto _Next2 = _Right._Find_last(_Keyval, _Right._Traitsobj(_Keyval))._Duplicate;
if (!(static_cast<bool>(_Next2) && _Traits::_Nonkfn(_LVal) == _Traits::_Nonkfn(_Next2->_Myval))) {
return false;
}
}
return true;
}
template <class _Traits>
_NODISCARD bool _Hash_equal_elements(const _Hash<_Traits>& _Left, const _Hash<_Traits>& _Right, true_type) {
return _Left._Multi_equal(_Right);
}
#endif // !_HAS_IF_CONSTEXPR
template <class _Traits>
_NODISCARD bool _Hash_equal(const _Hash<_Traits>& _Left, const _Hash<_Traits>& _Right) {
if (_Left.size() != _Right.size()) {
return false;
}
#if _HAS_IF_CONSTEXPR
if constexpr (_Traits::_Multi) {
return _Left._Multi_equal(_Right);
} else {
for (const auto& _LVal : _Left) {
// look for element with equivalent key
const auto& _Keyval = _Traits::_Kfn(_LVal);
const auto _Next2 = _Right._Find_last(_Keyval, _Right._Traitsobj(_Keyval))._Duplicate;
if (!(static_cast<bool>(_Next2) && _Traits::_Nonkfn(_LVal) == _Traits::_Nonkfn(_Next2->_Myval))) {
return false;
}
}
}
return true;
#else // ^^^ _HAS_IF_CONSTEXPR ^^^ / vvv !_HAS_IF_CONSTEXPR vvv
return _Hash_equal_elements(_Left, _Right, bool_constant<_Traits::_Multi>{});
#endif // _HAS_IF_CONSTEXPR
}
_STD_END
#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _XHASH_
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку