| // -*- 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_FRONT_H | |
| #define _LIBCPP___FUNCTIONAL_BIND_FRONT_H | |
| #include <__config> | |
| #include <__functional/perfect_forward.h> | |
| #include <__functional/invoke.h> | |
| #include <type_traits> | |
| #include <utility> | |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | |
| #pragma GCC system_header | |
| #endif | |
| _LIBCPP_BEGIN_NAMESPACE_STD | |
| #if _LIBCPP_STD_VER > 17 | |
| struct __bind_front_op | |
| { | |
| template<class... _Args> | |
| constexpr static auto __call(_Args&&... __args) | |
| noexcept(noexcept(_VSTD::invoke(_VSTD::forward<_Args>(__args)...))) | |
| -> decltype( _VSTD::invoke(_VSTD::forward<_Args>(__args)...)) | |
| { return _VSTD::invoke(_VSTD::forward<_Args>(__args)...); } | |
| }; | |
| template<class _Fn, class... _Args, | |
| class = _EnableIf<conjunction<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>> | |
| constexpr auto bind_front(_Fn&& __f, _Args&&... __args) | |
| { | |
| return __perfect_forward<__bind_front_op, _Fn, _Args...>(_VSTD::forward<_Fn>(__f), | |
| _VSTD::forward<_Args>(__args)...); | |
| } | |
| #endif // _LIBCPP_STD_VER > 17 | |
| _LIBCPP_END_NAMESPACE_STD | |
| #endif // _LIBCPP___FUNCTIONAL_BIND_FRONT_H |