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
22template <class _Arg, class _Result>
23struct _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
30template <class _Arg, class _Result>
31struct __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_SUPPRESS_DEPRECATED_PUSH
40template <class _Arg, class _Result>
41using __unary_function _LIBCPP_NODEBUG = unary_function<_Arg, _Result>;
42_LIBCPP_SUPPRESS_DEPRECATED_POP
43#else
44template <class _Arg, class _Result>
45using __unary_function _LIBCPP_NODEBUG = __unary_function_keep_layout_base<_Arg, _Result>;
46#endif
47
48_LIBCPP_END_NAMESPACE_STD
49
50#endif // _LIBCPP___FUNCTIONAL_UNARY_FUNCTION_H
51