//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//==============================================================================
// NOTICE: This file has been modified by Green Hills Software, Inc.  Such
// modifications are subject to copyright by Green Hills Software, Inc.  See the
// "Green Hills Software Modifications" section in the LICENSE.txt included with
// this distribution for more information.
//==============================================================================

#ifndef _LIBCPP___CONCEPTS_COMMON_WITH_H
#define _LIBCPP___CONCEPTS_COMMON_WITH_H

#include <__concepts/common_reference_with.h>
#include <__concepts/same_as.h>
#include <__config>
#include <type_traits>

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

#if defined(__ghs__)
  #pragma ghs start_cxx_lib_header
  #pragma ghs startdata
  #if defined(__ghs_max_pack_value)
    #pragma pack (push, __ghs_max_pack_value)
  #endif
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER > 17

// [concept.common]

template<class _Tp, class _Up>
concept common_with =
  same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> &&
  requires {
    static_cast<common_type_t<_Tp, _Up>>(declval<_Tp>());
    static_cast<common_type_t<_Tp, _Up>>(declval<_Up>());
  } &&
  common_reference_with<
    add_lvalue_reference_t<const _Tp>,
    add_lvalue_reference_t<const _Up>> &&
  common_reference_with<
    add_lvalue_reference_t<common_type_t<_Tp, _Up>>,
    common_reference_t<
      add_lvalue_reference_t<const _Tp>,
      add_lvalue_reference_t<const _Up>>>;

#endif // _LIBCPP_STD_VER > 17

_LIBCPP_END_NAMESPACE_STD

#if defined(__ghs__)
  #if defined(__ghs_max_pack_value)
    #pragma pack(pop)
  #endif
  #pragma ghs enddata
  #pragma ghs end_cxx_lib_header
#endif

#endif // _LIBCPP___CONCEPTS_COMMON_WITH_H