368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
101 lines
2.7 KiB
C++
101 lines
2.7 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 <__functional/weak_result_type.h>
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#include <__utility/forward.h>
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#include <type_traits>
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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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template <class _Ret, bool = is_void<_Ret>::value>
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struct __invoke_void_return_wrapper
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{
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#ifndef _LIBCPP_CXX03_LANG
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template <class ..._Args>
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static _Ret __call(_Args&&... __args) {
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return _VSTD::__invoke(_VSTD::forward<_Args>(__args)...);
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}
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#else
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template <class _Fn>
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static _Ret __call(_Fn __f) {
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return _VSTD::__invoke(__f);
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}
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template <class _Fn, class _A0>
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static _Ret __call(_Fn __f, _A0& __a0) {
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return _VSTD::__invoke(__f, __a0);
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}
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template <class _Fn, class _A0, class _A1>
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static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1) {
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return _VSTD::__invoke(__f, __a0, __a1);
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}
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template <class _Fn, class _A0, class _A1, class _A2>
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static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2){
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return _VSTD::__invoke(__f, __a0, __a1, __a2);
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}
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#endif
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};
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template <class _Ret>
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struct __invoke_void_return_wrapper<_Ret, true>
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{
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#ifndef _LIBCPP_CXX03_LANG
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template <class ..._Args>
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static void __call(_Args&&... __args) {
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_VSTD::__invoke(_VSTD::forward<_Args>(__args)...);
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}
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#else
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template <class _Fn>
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static void __call(_Fn __f) {
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_VSTD::__invoke(__f);
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}
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template <class _Fn, class _A0>
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static void __call(_Fn __f, _A0& __a0) {
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_VSTD::__invoke(__f, __a0);
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}
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template <class _Fn, class _A0, class _A1>
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static void __call(_Fn __f, _A0& __a0, _A1& __a1) {
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_VSTD::__invoke(__f, __a0, __a1);
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}
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template <class _Fn, class _A0, class _A1, class _A2>
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static void __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2) {
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_VSTD::__invoke(__f, __a0, __a1, __a2);
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}
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#endif
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};
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#if _LIBCPP_STD_VER > 14
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template <class _Fn, class ..._Args>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 invoke_result_t<_Fn, _Args...>
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invoke(_Fn&& __f, _Args&&... __args)
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noexcept(is_nothrow_invocable_v<_Fn, _Args...>)
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{
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return _VSTD::__invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
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}
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_INVOKE_H
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