STL/stl/inc/ranges

// ranges standard header

// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#pragma once
#ifndef _RANGES_
#define _RANGES_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#ifndef __cpp_lib_concepts
#pragma message("The contents of <ranges> are available only with C++20 concepts support.")
#else // ^^^ !defined(__cpp_lib_concepts) / defined(__cpp_lib_concepts) vvv
#include <iterator>

#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
namespace ranges {
    // Much machinery defined in <xutility>

    // clang-format off
    // CONCEPT ranges::viewable_range
    template <class _Rng>
    concept viewable_range = range<_Rng>
        && (borrowed_range<_Rng> || view<remove_cvref_t<_Rng>>);
} // namespace ranges

_STD_END

#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // __cpp_lib_concepts
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _RANGES_