368faacac7
This commit reverts5aaefa51(and also partly7f285f48e7andb6d75682f9, which were related to the original commit). As landed,5aaefa51had 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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