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_NOTHROW_CONSTRUCTIBLE_H 10#define _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONSTRUCTIBLE_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14#include <__type_traits/is_constructible.h> 15#include <__type_traits/is_reference.h> 16#include <__utility/declval.h> 17#include <cstddef> 18 19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20# pragma GCC system_header 21#endif 22 23_LIBCPP_BEGIN_NAMESPACE_STD 24 25#if __has_builtin(__is_nothrow_constructible) 26 27template < 28 class _Tp, class... _Args> 29struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 30 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 31#else 32 33template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 34 35template <class _Tp, class... _Args> 36struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 37 : public integral_constant<bool, noexcept(_Tp(std::declval<_Args>()...))> 38{ 39}; 40 41template <class _Tp> 42void __implicit_conversion_to(_Tp) noexcept { } 43 44template <class _Tp, class _Arg> 45struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 46 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(std::declval<_Arg>()))> 47{ 48}; 49 50template <class _Tp, bool _IsReference, class... _Args> 51struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 52 : public false_type 53{ 54}; 55 56template <class _Tp, class... _Args> 57struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 58 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 59{ 60}; 61 62template <class _Tp, size_t _Ns> 63struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 64 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 65{ 66}; 67 68#endif // __has_builtin(__is_nothrow_constructible) 69 70 71#if _LIBCPP_STD_VER > 14 72template <class _Tp, class ..._Args> 73inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; 74#endif 75 76_LIBCPP_END_NAMESPACE_STD 77 78#endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONSTRUCTIBLE_H 79