| //===----------------------------------------------------------------------===// |
| // |
| // 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___TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_H |
| #define _LIBCPP___TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_H |
| |
| #include <__config> |
| #include <__type_traits/add_const.h> |
| #include <__type_traits/integral_constant.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if __has_keyword(__is_nothrow_assignable) |
| |
| template <class _Tp, class _Arg> |
| struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable |
| : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; |
| |
| #else |
| |
| template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; |
| |
| template <class _Tp, class _Arg> |
| struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> |
| : public false_type |
| { |
| }; |
| |
| template <class _Tp, class _Arg> |
| struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> |
| : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > |
| { |
| }; |
| |
| template <class _Tp, class _Arg> |
| struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable |
| : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> |
| { |
| }; |
| |
| #endif // _LIBCPP_HAS_NO_NOEXCEPT |
| |
| #if _LIBCPP_STD_VER > 14 |
| template <class _Tp, class _Arg> |
| inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Arg>::value; |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_H |