libcxx/include/__functional/unary_function.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___FUNCTIONAL_UNARY_FUNCTION_H
  10 #define _LIBCPP___FUNCTIONAL_UNARY_FUNCTION_H
  11
  12 #include <__config>
  13
  14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  15 #  pragma GCC system_header
  16 #endif
  17
  18 _LIBCPP_BEGIN_NAMESPACE_STD
  19
  20 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION)
  21
  22 template <class _Arg, class _Result>
  23 struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 unary_function {
  24   typedef _Arg argument_type;
  25   typedef _Result result_type;
  26 };
  27
  28 #endif // _LIBCPP_STD_VER <= 14
  29
  30 template <class _Arg, class _Result>
  31 struct __unary_function_keep_layout_base {
  32 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
  33   using argument_type _LIBCPP_DEPRECATED_IN_CXX17 = _Arg;
  34   using result_type _LIBCPP_DEPRECATED_IN_CXX17   = _Result;
  35 #endif
  36 };
  37
  38 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION)
  39 _LIBCPP_DIAGNOSTIC_PUSH
  40 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated-declarations")
  41 template <class _Arg, class _Result>
  42 using __unary_function = unary_function<_Arg, _Result>;
  43 _LIBCPP_DIAGNOSTIC_POP
  44 #else
  45 template <class _Arg, class _Result>
  46 using __unary_function = __unary_function_keep_layout_base<_Arg, _Result>;
  47 #endif
  48
  49 _LIBCPP_END_NAMESPACE_STD
  50
  51 #endif // _LIBCPP___FUNCTIONAL_UNARY_FUNCTION_H