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 | |
33 | namespace 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 | |