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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___TYPE_TRAITS_IS_ASSIGNABLE_H
10#define _LIBCPP___TYPE_TRAITS_IS_ASSIGNABLE_H
11
12#include <__config>
13#include <__type_traits/add_lvalue_reference.h>
14#include <__type_traits/add_rvalue_reference.h>
15#include <__type_traits/integral_constant.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18# pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23template <class _Tp, class _Up>
24struct _LIBCPP_NO_SPECIALIZATIONS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> {};
25
26#if _LIBCPP_STD_VER >= 17
27template <class _Tp, class _Arg>
28_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Arg);
29#endif
30
31template <class _Tp>
32struct _LIBCPP_NO_SPECIALIZATIONS is_copy_assignable
33 : integral_constant<bool, __is_assignable(__add_lvalue_reference_t<_Tp>, __add_lvalue_reference_t<const _Tp>)> {};
34
35#if _LIBCPP_STD_VER >= 17
36template <class _Tp>
37_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
38#endif
39
40template <class _Tp>
41struct _LIBCPP_NO_SPECIALIZATIONS is_move_assignable
42 : integral_constant<bool, __is_assignable(__add_lvalue_reference_t<_Tp>, __add_rvalue_reference_t<_Tp>)> {};
43
44#if _LIBCPP_STD_VER >= 17
45template <class _Tp>
46_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
47#endif
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP___TYPE_TRAITS_IS_ASSIGNABLE_H
52

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source code of libcxx/include/__type_traits/is_assignable.h