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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/libcxx/include/__functional/ranges_operations.h
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// -*- C++ -*-

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//===----------------------------------------------------------------------===//

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//

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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

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// See https://llvm.org/LICENSE.txt for license information.

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

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//

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//===----------------------------------------------------------------------===//

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#ifndef _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H

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#define _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H

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#include <__concepts/equality_comparable.h>

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#include <__concepts/totally_ordered.h>

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#include <__config>

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#include <__type_traits/desugars_to.h>

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#include <__utility/forward.h>

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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

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#  pragma GCC system_header

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#endif

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_LIBCPP_BEGIN_NAMESPACE_STD

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#if _LIBCPP_STD_VER >= 20

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namespace ranges {

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struct equal_to {

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  template <class _Tp, class _Up>

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    requires equality_comparable_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(std::forward<_Tp>(__t) == std::forward<_Up>(__u)))) {

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    return std::forward<_Tp>(__t) == std::forward<_Up>(__u);

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  }

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  using is_transparent = void;

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};

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struct not_equal_to {

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  template <class _Tp, class _Up>

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    requires equality_comparable_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(!(std::forward<_Tp>(__t) == std::forward<_Up>(__u))))) {

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    return !(std::forward<_Tp>(__t) == std::forward<_Up>(__u));

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  }

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  using is_transparent = void;

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};

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struct less {

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  template <class _Tp, class _Up>

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    requires totally_ordered_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(std::forward<_Tp>(__t) < std::forward<_Up>(__u)))) {

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    return std::forward<_Tp>(__t) < std::forward<_Up>(__u);

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  }

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  using is_transparent = void;

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};

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struct less_equal {

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  template <class _Tp, class _Up>

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    requires totally_ordered_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(!(std::forward<_Up>(__u) < std::forward<_Tp>(__t))))) {

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    return !(std::forward<_Up>(__u) < std::forward<_Tp>(__t));

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  }

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  using is_transparent = void;

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};

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struct greater {

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  template <class _Tp, class _Up>

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    requires totally_ordered_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(std::forward<_Up>(__u) < std::forward<_Tp>(__t)))) {

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    return std::forward<_Up>(__u) < std::forward<_Tp>(__t);

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  }

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  using is_transparent = void;

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};

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struct greater_equal {

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  template <class _Tp, class _Up>

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    requires totally_ordered_with<_Tp, _Up>

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  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const

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      noexcept(noexcept(bool(!(std::forward<_Tp>(__t) < std::forward<_Up>(__u))))) {

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    return !(std::forward<_Tp>(__t) < std::forward<_Up>(__u));

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  }

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  using is_transparent = void;

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};

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} // namespace ranges

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// For ranges we do not require that the types on each side of the equality

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// operator are of the same type

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template <class _Tp, class _Up>

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inline const bool __desugars_to_v<__equal_tag, ranges::equal_to, _Tp, _Up> = true;

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template <class _Tp, class _Up>

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inline const bool __desugars_to_v<__less_tag, ranges::less, _Tp, _Up> = true;

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#endif // _LIBCPP_STD_VER >= 20

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_LIBCPP_END_NAMESPACE_STD

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#endif // _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H

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