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 
24 template <class __Operation>
25 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 binder1st
26     : public unary_function<typename __Operation::second_argument_type,
27                             typename __Operation::result_type>
28 {
29 protected:
30     __Operation                               op;
31     typename __Operation::first_argument_type value;
32 public:
33     _LIBCPP_INLINE_VISIBILITY binder1st(const __Operation& __x,
34                                const typename __Operation::first_argument_type __y)
35         : op(__x), value(__y) {}
36     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
37         (typename __Operation::second_argument_type& __x) const
38             {return op(value, __x);}
39     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
40         (const typename __Operation::second_argument_type& __x) const
41             {return op(value, __x);}
42 };
43 
44 template <class __Operation, class _Tp>
45 _LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
46 binder1st<__Operation>
47 bind1st(const __Operation& __op, const _Tp& __x)
48     {return binder1st<__Operation>(__op, __x);}
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
55