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