1//
2// Boost.Pointer Container
3//
4// Copyright Thorsten Ottosen 2003-2007. Use, modification and
5// distribution is subject to the Boost Software License, Version
6// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8//
9// For more information, see http://www.boost.org/libs/ptr_container/
10//
11
12#ifndef BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP
13#define BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP
14
15#if defined(_MSC_VER) && (_MSC_VER >= 1200)
16 #pragma once
17#endif
18
19#include <boost/config.hpp>
20
21#ifdef BOOST_NO_SFINAE
22#else
23#include <boost/utility/result_of.hpp>
24#include <boost/pointee.hpp>
25#endif // BOOST_NO_SFINAE
26
27#include <boost/assert.hpp>
28#include <boost/static_assert.hpp>
29#include <boost/type_traits/is_void.hpp>
30#include <functional>
31
32
33namespace boost
34{
35
36 namespace ptr_container_detail
37 {
38 template <typename Type, typename Dummy>
39 struct make_lazy
40 {
41 typedef typename Type::type type;
42 };
43 }
44
45 template
46 <
47 class Fun
48#ifdef BOOST_NO_SFINAE
49 , class Result = bool
50#endif
51 >
52 class indirect_fun
53 {
54 Fun fun;
55 public:
56 indirect_fun() : fun(Fun())
57 { }
58
59 indirect_fun( Fun f ) : fun(f)
60 { }
61
62 template< class T >
63#ifdef BOOST_NO_SFINAE
64 Result
65#else
66 typename boost::result_of< const Fun( typename pointee<T>::type& ) >::type
67#endif
68 operator()( const T& r ) const
69 {
70 return fun( *r );
71 }
72
73 template< class T, class U >
74#ifdef BOOST_NO_SFINAE
75 Result
76#else
77 typename boost::result_of< const Fun( typename pointee<T>::type&,
78 typename pointee<U>::type& ) >::type
79#endif
80 operator()( const T& r, const U& r2 ) const
81 {
82 return fun( *r, *r2 );
83 }
84 };
85
86 template< class Fun >
87 inline indirect_fun<Fun> make_indirect_fun( Fun f )
88 {
89 return indirect_fun<Fun>( f );
90 }
91
92
93 template
94 <
95 class Fun,
96 class Arg1,
97 class Arg2 = Arg1
98#ifdef BOOST_NO_SFINAE
99 , class Result = bool
100#endif
101 >
102 class void_ptr_indirect_fun
103 {
104 Fun fun;
105
106 public:
107
108 void_ptr_indirect_fun() : fun(Fun())
109 { }
110
111 void_ptr_indirect_fun( Fun f ) : fun(f)
112 { }
113
114 template< class Void >
115#ifdef BOOST_NO_SFINAE
116 Result
117#else
118 typename ptr_container_detail::make_lazy<
119 boost::result_of<const Fun(const Arg1&)>, Void>::type
120#endif
121 operator()( const Void* r ) const
122 {
123 BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
124 BOOST_ASSERT( r != 0 );
125 return fun( * static_cast<const Arg1*>( r ) );
126 }
127
128 template< class Void >
129#ifdef BOOST_NO_SFINAE
130 Result
131#else
132 typename ptr_container_detail::make_lazy<
133 boost::result_of<const Fun(const Arg1&, const Arg2&)>, Void>::type
134#endif
135 operator()( const Void* l, const Void* r ) const
136 {
137 BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
138 BOOST_ASSERT( l != 0 && r != 0 );
139 return fun( * static_cast<const Arg1*>( l ), * static_cast<const Arg2*>( r ) );
140 }
141 };
142
143 template< class Arg, class Fun >
144 inline void_ptr_indirect_fun<Fun,Arg> make_void_ptr_indirect_fun( Fun f )
145 {
146 return void_ptr_indirect_fun<Fun,Arg>( f );
147 }
148
149} // namespace 'boost'
150
151#endif
152

source code of boost/libs/ptr_container/include/boost/ptr_container/indirect_fun.hpp