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//===----------------------------------------------------------------------===//
//
// 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
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___FUNCTIONAL_BIND_BACK_H
#define _LIBCUDACXX___FUNCTIONAL_BIND_BACK_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__functional/invoke.h"
#include "../__functional/perfect_forward.h"
#include "../__fwd/get.h"
#include "../__tuple_dir/tuple_size.h"
#include "../__type_traits/decay.h"
#include "../__type_traits/enable_if.h"
#include "../__type_traits/is_constructible.h"
#include "../__type_traits/is_move_constructible.h"
#include "../__utility/forward.h"
#include "../__utility/integer_sequence.h"
#include "../tuple"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 14
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>
_LIBCUDACXX_HIDE_FROM_ABI _LIBCUDACXX_INLINE_VISIBILITY
constexpr auto operator()(_Fn&& __f, _BoundArgs&& __bound_args, _Args&&... __args) const
noexcept(noexcept(_CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward<_Args>(__args)..., _CUDA_VSTD::get<_Ip>(_CUDA_VSTD::forward<_BoundArgs>(__bound_args))...)))
-> decltype( _CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward<_Args>(__args)..., _CUDA_VSTD::get<_Ip>(_CUDA_VSTD::forward<_BoundArgs>(__bound_args))...))
{ return _CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward<_Args>(__args)..., _CUDA_VSTD::get<_Ip>(_CUDA_VSTD::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, class = enable_if_t<
_And<
is_constructible<decay_t<_Fn>, _Fn>,
is_move_constructible<decay_t<_Fn>>,
is_constructible<decay_t<_Args>, _Args>...,
is_move_constructible<decay_t<_Args>>...
>::value
>>
_LIBCUDACXX_HIDE_FROM_ABI _LIBCUDACXX_INLINE_VISIBILITY
constexpr auto __bind_back(_Fn&& __f, _Args&&... __args)
noexcept(noexcept(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward_as_tuple(_CUDA_VSTD::forward<_Args>(__args)...))))
-> decltype( __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward_as_tuple(_CUDA_VSTD::forward<_Args>(__args)...)))
{ return __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_CUDA_VSTD::forward<_Fn>(__f), _CUDA_VSTD::forward_as_tuple(_CUDA_VSTD::forward<_Args>(__args)...)); }
#endif // _LIBCUDACXX_STD_VER > 14
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___FUNCTIONAL_BIND_BACK_H
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