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54 lines
2 KiB
C++
54 lines
2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FUNCTIONAL_INVOKE_H
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#define _LIBCPP___FUNCTIONAL_INVOKE_H
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#include <__config>
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#include <__type_traits/invoke.h>
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#include <__utility/forward.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 17
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template <class _Fn, class... _Args>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 invoke_result_t<_Fn, _Args...>
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invoke(_Fn&& __f, _Args&&... __args) noexcept(is_nothrow_invocable_v<_Fn, _Args...>) {
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return std::__invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...);
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}
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#endif // _LIBCPP_STD_VER >= 17
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#if _LIBCPP_STD_VER >= 23
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template <class _Result, class _Fn, class... _Args>
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requires is_invocable_r_v<_Result, _Fn, _Args...>
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_LIBCPP_HIDE_FROM_ABI constexpr _Result
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invoke_r(_Fn&& __f, _Args&&... __args) noexcept(is_nothrow_invocable_r_v<_Result, _Fn, _Args...>) {
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if constexpr (is_void_v<_Result>) {
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static_cast<void>(std::invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...));
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} else {
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// TODO: Use reference_converts_from_temporary_v once implemented
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// using _ImplicitInvokeResult = invoke_result_t<_Fn, _Args...>;
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// static_assert(!reference_converts_from_temporary_v<_Result, _ImplicitInvokeResult>,
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static_assert(true,
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"Returning from invoke_r would bind a temporary object to the reference return type, "
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"which would result in a dangling reference.");
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return std::invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...);
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}
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_INVOKE_H
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