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_BINDER1ST_H
11#define _LIBCPP___FUNCTIONAL_BINDER1ST_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
24template <class _Operation>
25class _LIBCPP_DEPRECATED_IN_CXX11 binder1st
26    : public __unary_function<typename _Operation::second_argument_type, typename _Operation::result_type> {
27protected:
28  _Operation op;
29  typename _Operation::first_argument_type value;
30
31public:
32  _LIBCPP_HIDE_FROM_ABI binder1st(const _Operation& __x, const typename _Operation::first_argument_type __y)
33      : op(__x), value(__y) {}
34  _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
35  operator()(typename _Operation::second_argument_type& __x) const {
36    return op(value, __x);
37  }
38  _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
39  operator()(const typename _Operation::second_argument_type& __x) const {
40    return op(value, __x);
41  }
42};
43
44template <class _Operation, class _Tp>
45_LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_HIDE_FROM_ABI binder1st<_Operation>
46bind1st(const _Operation& __op, const _Tp& __x) {
47  return binder1st<_Operation>(__op, __x);
48}
49
50#endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS)
51
52_LIBCPP_END_NAMESPACE_STD
53
54#endif // _LIBCPP___FUNCTIONAL_BINDER1ST_H