// -*- C++ -*-
//===-------------------------- concepts ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CONCEPTS
#define _LIBCPP_CONCEPTS

/*
    concepts synopsis
namespace std {
  // [concepts.lang], language-related concepts
  // [concept.same], concept same_as
  template<class T, class U>
    concept same_as = see below;

  // [concept.derived], concept derived_from
  template<class Derived, class Base>
    concept derived_from = see below;

  // [concept.convertible], concept convertible_to
  template<class From, class To>
    concept convertible_to = see below;

  // [concept.commonref], concept common_reference_with
  template<class T, class U>
    concept common_reference_with = see below;

  // [concept.common], concept common_with
  template<class T, class U>
    concept common_with = see below;

  // [concepts.arithmetic], arithmetic concepts
  template<class T>
    concept integral = see below;
  template<class T>
    concept signed_integral = see below;
  template<class T>
    concept unsigned_integral = see below;
  template<class T>
    concept floating_point = see below;

  // [concept.assignable], concept assignable_from
  template<class LHS, class RHS>
    concept assignable_from = see below;

  // [concept.swappable], concept swappable
  namespace ranges {
    inline namespace unspecified {
      inline constexpr unspecified swap = unspecified;
    }
  }
  template<class T>
    concept swappable = see below;
  template<class T, class U>
    concept swappable_with = see below;

  // [concept.destructible], concept destructible
  template<class T>
    concept destructible = see below;

  // [concept.constructible], concept constructible_from
  template<class T, class... Args>
    concept constructible_from = see below;

  // [concept.defaultconstructible], concept default_constructible
  template<class T>
    concept default_constructible = see below;

  // [concept.moveconstructible], concept move_constructible
  template<class T>
    concept move_constructible = see below;

  // [concept.copyconstructible], concept copy_constructible
  template<class T>
    concept copy_constructible = see below;

  // [concepts.compare], comparison concepts
  // [concept.boolean], concept boolean
  template<class B>
    concept boolean = see below;

  // [concept.equalitycomparable], concept equality_comparable
  template<class T>
    concept equality_comparable = see below;
  template<class T, class U>
    concept equality_comparable_with = see below;

  // [concept.totallyordered], concept totally_ordered
  template<class T>
    concept totally_ordered = see below;
  template<class T, class U>
    concept totally_ordered_with = see below;

  // [concepts.object], object concepts
  template<class T>
    concept movable = see below;
  template<class T>
    concept copyable = see below;
  template<class T>
    concept semiregular = see below;
  template<class T>
    concept regular = see below;

  // [concepts.callable], callable concepts
  // [concept.invocable], concept invocable
  template<class F, class... Args>
    concept invocable = see below;

  // [concept.regularinvocable], concept regular_invocable
  template<class F, class... Args>
    concept regular_invocable = see below;

  // [concept.predicate], concept predicate
  template<class F, class... Args>
    concept predicate = see below;

  // [concept.relation], concept relation
  template<class R, class T, class U>
    concept relation = see below;

  // [concept.equiv], concept equivalence_relation
  template<class R, class T, class U>
    concept equivalence_relation = see below;

  // [concept.strictweakorder], concept strict_weak_order
  template<class R, class T, class U>
    concept strict_weak_order = see below;
}

*/

#include <__config>
#include <type_traits>
#include <version>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L

// [concept.same]

template<class _Tp, class _Up>
concept __same_as_impl = _VSTD::_IsSame<_Tp, _Up>::value;

template<class _Tp, class _Up>
concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>;

#endif //_LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP_CONCEPTS