libcxx/include/__functional/pointer_to_unary_function.h

   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-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _LIBCPP___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H
  11 #define _LIBCPP___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H
  12
  13 #include <__config>
  14 #include <__functional/unary_function.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
  23
  24 template <class _Arg, class _Result>
  25 class _LIBCPP_TEMPLATE_VIS
  26 _LIBCPP_DEPRECATED_IN_CXX11 pointer_to_unary_function : public __unary_function<_Arg, _Result> {
  27   _Result (*__f_)(_Arg);
  28
  29 public:
  30   _LIBCPP_HIDE_FROM_ABI explicit pointer_to_unary_function(_Result (*__f)(_Arg)) : __f_(__f) {}
  31   _LIBCPP_HIDE_FROM_ABI _Result operator()(_Arg __x) const { return __f_(__x); }
  32 };
  33
  34 template <class _Arg, class _Result>
  35 _LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_HIDE_FROM_ABI pointer_to_unary_function<_Arg, _Result>
  36 ptr_fun(_Result (*__f)(_Arg)) {
  37   return pointer_to_unary_function<_Arg, _Result>(__f);
  38 }
  39
  40 #endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
  41
  42 _LIBCPP_END_NAMESPACE_STD
  43
  44 #endif // _LIBCPP___FUNCTIONAL_POINTER_TO_UNARY_FUNCTION_H