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1 | // Boost.Range library |
2 | // | |
3 | // Copyright Thorsten Ottosen 2003-2004. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | // | |
8 | // For more information, see http://www.boost.org/libs/range/ | |
9 | // | |
10 | ||
11 | #ifndef BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP | |
12 | #define BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP | |
13 | ||
14 | #include <boost/range/detail/common.hpp> | |
15 | #include <boost/iterator/iterator_traits.hpp> | |
16 | ||
17 | ////////////////////////////////////////////////////////////////////////////// | |
18 | // missing partial specialization workaround. | |
19 | ////////////////////////////////////////////////////////////////////////////// | |
20 | ||
21 | namespace boost | |
22 | { | |
23 | namespace range_detail | |
24 | { | |
25 | template< typename T > | |
26 | struct range_difference_type_; | |
27 | ||
28 | template<> | |
29 | struct range_difference_type_<std_container_> | |
30 | { | |
31 | template< typename C > | |
32 | struct pts | |
33 | { | |
34 | typedef BOOST_DEDUCED_TYPENAME C::difference_type type; | |
35 | }; | |
36 | }; | |
37 | ||
38 | template<> | |
39 | struct range_difference_type_<std_pair_> | |
40 | { | |
41 | template< typename P > | |
42 | struct pts | |
43 | { | |
44 | typedef BOOST_RANGE_DEDUCED_TYPENAME boost::iterator_difference< BOOST_DEDUCED_TYPENAME P::first_type>::type type; | |
45 | }; | |
46 | }; | |
47 | ||
48 | template<> | |
49 | struct range_difference_type_<array_> | |
50 | { | |
51 | template< typename A > | |
52 | struct pts | |
53 | { | |
54 | typedef std::ptrdiff_t type; | |
55 | }; | |
56 | }; | |
57 | ||
58 | template<> | |
59 | struct range_difference_type_<char_array_> | |
60 | { | |
61 | template< typename A > | |
62 | struct pts | |
63 | { | |
64 | typedef std::ptrdiff_t type; | |
65 | }; | |
66 | }; | |
67 | ||
68 | template<> | |
69 | struct range_difference_type_<char_ptr_> | |
70 | { | |
71 | template< typename S > | |
72 | struct pts | |
73 | { | |
74 | typedef std::ptrdiff_t type; | |
75 | }; | |
76 | }; | |
77 | ||
78 | template<> | |
79 | struct range_difference_type_<const_char_ptr_> | |
80 | { | |
81 | template< typename S > | |
82 | struct pts | |
83 | { | |
84 | typedef std::ptrdiff_t type; | |
85 | }; | |
86 | }; | |
87 | ||
88 | template<> | |
89 | struct range_difference_type_<wchar_t_ptr_> | |
90 | { | |
91 | template< typename S > | |
92 | struct pts | |
93 | { | |
94 | typedef std::ptrdiff_t type; | |
95 | }; | |
96 | }; | |
97 | ||
98 | template<> | |
99 | struct range_difference_type_<const_wchar_t_ptr_> | |
100 | { | |
101 | template< typename S > | |
102 | struct pts | |
103 | { | |
104 | typedef std::ptrdiff_t type; | |
105 | }; | |
106 | }; | |
107 | ||
108 | } | |
109 | ||
110 | template< typename C > | |
111 | class range_difference | |
112 | { | |
113 | typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range<C>::type c_type; | |
114 | public: | |
115 | typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range_difference_type_<c_type>::BOOST_NESTED_TEMPLATE pts<C>::type type; | |
116 | }; | |
117 | ||
118 | } | |
119 | ||
120 | #endif | |
121 |