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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___CXX03___FUNCTIONAL_BINDER1ST_H
11#define _LIBCPP___CXX03___FUNCTIONAL_BINDER1ST_H
12
13#include <__cxx03/__config>
14#include <__cxx03/__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
22template <class _Operation>
23class _LIBCPP_TEMPLATE_VIS binder1st
24 : public __unary_function<typename _Operation::second_argument_type, typename _Operation::result_type> {
25protected:
26 _Operation op;
27 typename _Operation::first_argument_type value;
28
29public:
30 _LIBCPP_HIDE_FROM_ABI binder1st(const _Operation& __x, const typename _Operation::first_argument_type __y)
31 : op(__x), value(__y) {}
32 _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
33 operator()(typename _Operation::second_argument_type& __x) const {
34 return op(value, __x);
35 }
36 _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
37 operator()(const typename _Operation::second_argument_type& __x) const {
38 return op(value, __x);
39 }
40};
41
42template <class _Operation, class _Tp>
43inline _LIBCPP_HIDE_FROM_ABI binder1st<_Operation> bind1st(const _Operation& __op, const _Tp& __x) {
44 return binder1st<_Operation>(__op, __x);
45}
46
47_LIBCPP_END_NAMESPACE_STD
48
49#endif // _LIBCPP___CXX03___FUNCTIONAL_BINDER1ST_H
50

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source code of libcxx/include/__cxx03/__functional/binder1st.h