mirror of
https://github.com/ziglang/zig.git
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95 lines
4.4 KiB
C++
Vendored
95 lines
4.4 KiB
C++
Vendored
// -*- 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_PERFECT_FORWARD_H
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#define _LIBCPP___FUNCTIONAL_PERFECT_FORWARD_H
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#include <__config>
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#include <__utility/declval.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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#include <tuple>
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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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#if _LIBCPP_STD_VER > 14
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template <class _Op, class _Indices, class... _BoundArgs>
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struct __perfect_forward_impl;
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template <class _Op, size_t... _Idx, class... _BoundArgs>
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struct __perfect_forward_impl<_Op, index_sequence<_Idx...>, _BoundArgs...> {
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private:
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tuple<_BoundArgs...> __bound_args_;
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public:
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template <class... _Args, class = enable_if_t<
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is_constructible_v<tuple<_BoundArgs...>, _Args&&...>
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>>
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explicit constexpr __perfect_forward_impl(_Args&&... __bound_args)
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: __bound_args_(_VSTD::forward<_Args>(__bound_args)...) {}
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__perfect_forward_impl(__perfect_forward_impl const&) = default;
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__perfect_forward_impl(__perfect_forward_impl&&) = default;
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__perfect_forward_impl& operator=(__perfect_forward_impl const&) = default;
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__perfect_forward_impl& operator=(__perfect_forward_impl&&) = default;
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template <class... _Args, class = enable_if_t<is_invocable_v<_Op, _BoundArgs&..., _Args...>>>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Args&&... __args) &
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noexcept(noexcept(_Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...)))
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-> decltype( _Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...))
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{ return _Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...); }
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template <class... _Args, class = enable_if_t<!is_invocable_v<_Op, _BoundArgs&..., _Args...>>>
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auto operator()(_Args&&...) & = delete;
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template <class... _Args, class = enable_if_t<is_invocable_v<_Op, _BoundArgs const&..., _Args...>>>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Args&&... __args) const&
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noexcept(noexcept(_Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...)))
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-> decltype( _Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...))
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{ return _Op()(_VSTD::get<_Idx>(__bound_args_)..., _VSTD::forward<_Args>(__args)...); }
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template <class... _Args, class = enable_if_t<!is_invocable_v<_Op, _BoundArgs const&..., _Args...>>>
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auto operator()(_Args&&...) const& = delete;
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template <class... _Args, class = enable_if_t<is_invocable_v<_Op, _BoundArgs..., _Args...>>>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Args&&... __args) &&
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noexcept(noexcept(_Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...)))
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-> decltype( _Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...))
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{ return _Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...); }
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template <class... _Args, class = enable_if_t<!is_invocable_v<_Op, _BoundArgs..., _Args...>>>
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auto operator()(_Args&&...) && = delete;
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template <class... _Args, class = enable_if_t<is_invocable_v<_Op, _BoundArgs const..., _Args...>>>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Args&&... __args) const&&
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noexcept(noexcept(_Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...)))
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-> decltype( _Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...))
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{ return _Op()(_VSTD::get<_Idx>(_VSTD::move(__bound_args_))..., _VSTD::forward<_Args>(__args)...); }
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template <class... _Args, class = enable_if_t<!is_invocable_v<_Op, _BoundArgs const..., _Args...>>>
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auto operator()(_Args&&...) const&& = delete;
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};
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// __perfect_forward implements a perfect-forwarding call wrapper as explained in [func.require].
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template <class _Op, class ..._Args>
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using __perfect_forward = __perfect_forward_impl<_Op, index_sequence_for<_Args...>, _Args...>;
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_PERFECT_FORWARD_H
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