1*4bdff4beSrobert // -*- C++ -*- 2*4bdff4beSrobert //===----------------------------------------------------------------------===// 3*4bdff4beSrobert // 4*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 6*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*4bdff4beSrobert // 8*4bdff4beSrobert //===----------------------------------------------------------------------===// 9*4bdff4beSrobert 10*4bdff4beSrobert #ifndef _LIBCPP___FUNCTIONAL_BIND_BACK_H 11*4bdff4beSrobert #define _LIBCPP___FUNCTIONAL_BIND_BACK_H 12*4bdff4beSrobert 13*4bdff4beSrobert #include <__config> 14*4bdff4beSrobert #include <__functional/invoke.h> 15*4bdff4beSrobert #include <__functional/perfect_forward.h> 16*4bdff4beSrobert #include <__utility/forward.h> 17*4bdff4beSrobert #include <__utility/integer_sequence.h> 18*4bdff4beSrobert #include <tuple> 19*4bdff4beSrobert #include <type_traits> 20*4bdff4beSrobert 21*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22*4bdff4beSrobert # pragma GCC system_header 23*4bdff4beSrobert #endif 24*4bdff4beSrobert 25*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 26*4bdff4beSrobert 27*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 28*4bdff4beSrobert 29*4bdff4beSrobert template <size_t _NBound, class = make_index_sequence<_NBound>> 30*4bdff4beSrobert struct __bind_back_op; 31*4bdff4beSrobert 32*4bdff4beSrobert template <size_t _NBound, size_t ..._Ip> 33*4bdff4beSrobert struct __bind_back_op<_NBound, index_sequence<_Ip...>> { 34*4bdff4beSrobert template <class _Fn, class _BoundArgs, class... _Args> 35*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Fn&& __f, _BoundArgs&& __bound_args, _Args&&... __args) const 36*4bdff4beSrobert noexcept(noexcept(_VSTD::invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)..., _VSTD::get<_Ip>(_VSTD::forward<_BoundArgs>(__bound_args))...))) 37*4bdff4beSrobert -> decltype( _VSTD::invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)..., _VSTD::get<_Ip>(_VSTD::forward<_BoundArgs>(__bound_args))...)) 38*4bdff4beSrobert { return _VSTD::invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)..., _VSTD::get<_Ip>(_VSTD::forward<_BoundArgs>(__bound_args))...); } 39*4bdff4beSrobert }; 40*4bdff4beSrobert 41*4bdff4beSrobert template <class _Fn, class _BoundArgs> 42*4bdff4beSrobert struct __bind_back_t : __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs> { 43*4bdff4beSrobert using __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs>::__perfect_forward; 44*4bdff4beSrobert }; 45*4bdff4beSrobert 46*4bdff4beSrobert template <class _Fn, class ..._Args, class = enable_if_t< 47*4bdff4beSrobert _And< 48*4bdff4beSrobert is_constructible<decay_t<_Fn>, _Fn>, 49*4bdff4beSrobert is_move_constructible<decay_t<_Fn>>, 50*4bdff4beSrobert is_constructible<decay_t<_Args>, _Args>..., 51*4bdff4beSrobert is_move_constructible<decay_t<_Args>>... 52*4bdff4beSrobert >::value 53*4bdff4beSrobert >> 54*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI 55*4bdff4beSrobert constexpr auto __bind_back(_Fn&& __f, _Args&&... __args) 56*4bdff4beSrobert noexcept(noexcept(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)))) 57*4bdff4beSrobert -> decltype( __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...))) 58*4bdff4beSrobert { return __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(_VSTD::forward<_Fn>(__f), _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)); } 59*4bdff4beSrobert 60*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 61*4bdff4beSrobert 62*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 63*4bdff4beSrobert 64*4bdff4beSrobert #endif // _LIBCPP___FUNCTIONAL_BIND_BACK_H 65