| //===----------------------------------------------------------------------===// |
| // |
| // 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_CONSTRUCTIBLE_H |
| #define _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONSTRUCTIBLE_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/is_constructible.h> |
| #include <__type_traits/is_reference.h> |
| #include <__utility/declval.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if __has_builtin(__is_nothrow_constructible) |
| |
| template < |
| class _Tp, class... _Args> |
| struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible |
| : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; |
| #else |
| |
| template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; |
| |
| template <class _Tp, class... _Args> |
| struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> |
| : public integral_constant<bool, noexcept(_Tp(std::declval<_Args>()...))> |
| { |
| }; |
| |
| template <class _Tp> |
| void __implicit_conversion_to(_Tp) noexcept { } |
| |
| template <class _Tp, class _Arg> |
| struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> |
| : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(std::declval<_Arg>()))> |
| { |
| }; |
| |
| template <class _Tp, bool _IsReference, class... _Args> |
| struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> |
| : public false_type |
| { |
| }; |
| |
| template <class _Tp, class... _Args> |
| struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible |
| : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> |
| { |
| }; |
| |
| template <class _Tp, size_t _Ns> |
| struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> |
| : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> |
| { |
| }; |
| |
| #endif // __has_builtin(__is_nothrow_constructible) |
| |
| |
| #if _LIBCPP_STD_VER > 14 |
| template <class _Tp, class ..._Args> |
| inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONSTRUCTIBLE_H |