| // -*- 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 |
