libcxx/include/__concepts/copyable.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___CONCEPTS_COPYABLE_H
  10 #define _LIBCPP___CONCEPTS_COPYABLE_H
  11
  12 #include <__concepts/assignable.h>
  13 #include <__concepts/constructible.h>
  14 #include <__concepts/movable.h>
  15 #include <__config>
  16
  17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  18 #pragma GCC system_header
  19 #endif
  20
  21 _LIBCPP_BEGIN_NAMESPACE_STD
  22
  23 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS)
  24
  25 // [concepts.object]
  26
  27 template<class _Tp>
  28 concept copyable =
  29   copy_constructible<_Tp> &&
  30   movable<_Tp> &&
  31   assignable_from<_Tp&, _Tp&> &&
  32   assignable_from<_Tp&, const _Tp&> &&
  33   assignable_from<_Tp&, const _Tp>;
  34
  35 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS)
  36
  37 _LIBCPP_END_NAMESPACE_STD
  38
  39 #endif // _LIBCPP___CONCEPTS_COPYABLE_H