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
22 template <class _Operation>
23 class _LIBCPP_TEMPLATE_VIS binder1st
24 : public __unary_function<typename _Operation::second_argument_type, typename _Operation::result_type> {
25 protected:
26 _Operation op;
27 typename _Operation::first_argument_type value;
28
29 public:
binder1st(const _Operation & __x,const typename _Operation::first_argument_type __y)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
operator()33 operator()(typename _Operation::second_argument_type& __x) const {
34 return op(value, __x);
35 }
36 _LIBCPP_HIDE_FROM_ABI typename _Operation::result_type
operator()37 operator()(const typename _Operation::second_argument_type& __x) const {
38 return op(value, __x);
39 }
40 };
41
42 template <class _Operation, class _Tp>
bind1st(const _Operation & __op,const _Tp & __x)43 inline _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