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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___FUNCTIONAL_BIND_BACK_H
#define _LIBCPP___FUNCTIONAL_BIND_BACK_H
#include <__config>
#include <__functional/invoke.h>
#include <__functional/perfect_forward.h>
#include <__type_traits/decay.h>
#include <__utility/forward.h>
#include <__utility/integer_sequence.h>
#include <tuple>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 20
template <size_t _NBound, class = make_index_sequence<_NBound>>
struct __bind_back_op;
template <size_t _NBound, size_t... _Ip>
struct __bind_back_op<_NBound, index_sequence<_Ip...>> {
template <class _Fn, class _BoundArgs, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Fn&& __f, _BoundArgs&& __bound_args, _Args&&... __args) const
noexcept(noexcept(std::invoke(std::forward<_Fn>(__f),
std::forward<_Args>(__args)...,
std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...)))
-> decltype(std::invoke(std::forward<_Fn>(__f),
std::forward<_Args>(__args)...,
std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...)) {
return std::invoke(std::forward<_Fn>(__f),
std::forward<_Args>(__args)...,
std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...);
}
};
template <class _Fn, class _BoundArgs>
struct __bind_back_t : __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs> {
using __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs>::__perfect_forward;
};
template <class _Fn, class... _Args>
requires is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> &&
(is_constructible_v<decay_t<_Args>, _Args> && ...) && (is_move_constructible_v<decay_t<_Args>> && ...)
_LIBCPP_HIDE_FROM_ABI constexpr auto __bind_back(_Fn&& __f, _Args&&... __args) noexcept(
noexcept(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...))))
-> decltype(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...))) {
return __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...));
}
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___FUNCTIONAL_BIND_BACK_H
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