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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_DIFFERENCE_TYPE_HPP | |
12 | #define BOOST_RANGE_DIFFERENCE_TYPE_HPP | |
13 | ||
14 | #if defined(_MSC_VER) | |
15 | # pragma once | |
16 | #endif | |
17 | ||
18 | #include <boost/mpl/and.hpp> | |
19 | #include <boost/range/config.hpp> | |
20 | #include <boost/range/iterator.hpp> | |
21 | #include <boost/range/has_range_iterator.hpp> | |
22 | #include <boost/iterator/iterator_traits.hpp> | |
23 | #include <boost/type_traits/remove_reference.hpp> | |
24 | ||
25 | namespace boost | |
26 | { | |
27 | namespace range_detail | |
28 | { | |
29 | template< class T, bool B = has_type<range_iterator<T> >::value > | |
30 | struct range_difference | |
31 | { }; | |
32 | ||
33 | template< class T > | |
34 | struct range_difference<T, true> | |
35 | : iterator_difference< | |
36 | BOOST_DEDUCED_TYPENAME range_iterator<T>::type | |
37 | > | |
38 | { }; | |
39 | } | |
40 | ||
41 | template< class T > | |
42 | struct range_difference | |
43 | : range_detail::range_difference<BOOST_DEDUCED_TYPENAME remove_reference<T>::type> | |
44 | { }; | |
45 | } | |
46 | ||
47 | #endif |