39 lines · c
1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___CXX03___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H11#define _LIBCPP___CXX03___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H12 13#include <__cxx03/__config>14#include <__cxx03/__functional/unary_function.h>15 16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)17# pragma GCC system_header18#endif19 20_LIBCPP_BEGIN_NAMESPACE_STD21 22template <class _Arg, class _Result>23class _LIBCPP_TEMPLATE_VIS pointer_to_unary_function : public __unary_function<_Arg, _Result> {24 _Result (*__f_)(_Arg);25 26public:27 _LIBCPP_HIDE_FROM_ABI explicit pointer_to_unary_function(_Result (*__f)(_Arg)) : __f_(__f) {}28 _LIBCPP_HIDE_FROM_ABI _Result operator()(_Arg __x) const { return __f_(__x); }29};30 31template <class _Arg, class _Result>32inline _LIBCPP_HIDE_FROM_ABI pointer_to_unary_function<_Arg, _Result> ptr_fun(_Result (*__f)(_Arg)) {33 return pointer_to_unary_function<_Arg, _Result>(__f);34}35 36_LIBCPP_END_NAMESPACE_STD37 38#endif // _LIBCPP___CXX03___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H39