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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_CONST_ITERATOR_HPP | |
12 | #define BOOST_RANGE_CONST_ITERATOR_HPP | |
13 | ||
14 | #if defined(_MSC_VER) | |
15 | # pragma once | |
16 | #endif | |
17 | ||
18 | #include <boost/range/config.hpp> | |
19 | ||
20 | #include <boost/range/range_fwd.hpp> | |
21 | #include <boost/range/detail/extract_optional_type.hpp> | |
22 | #include <boost/type_traits/remove_const.hpp> | |
23 | #include <boost/type_traits/remove_reference.hpp> | |
24 | #include <cstddef> | |
25 | #include <utility> | |
26 | ||
27 | namespace boost | |
28 | { | |
29 | ////////////////////////////////////////////////////////////////////////// | |
30 | // default | |
31 | ////////////////////////////////////////////////////////////////////////// | |
32 | ||
33 | namespace range_detail | |
34 | { | |
35 | ||
36 | BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( const_iterator ) | |
37 | ||
38 | template< typename C > | |
39 | struct range_const_iterator_helper | |
40 | : extract_const_iterator<C> | |
41 | {}; | |
42 | ||
43 | ////////////////////////////////////////////////////////////////////////// | |
44 | // pair | |
45 | ////////////////////////////////////////////////////////////////////////// | |
46 | ||
47 | template< typename Iterator > | |
48 | struct range_const_iterator_helper<std::pair<Iterator,Iterator> > | |
49 | { | |
50 | typedef Iterator type; | |
51 | }; | |
52 | ||
53 | ////////////////////////////////////////////////////////////////////////// | |
54 | // array | |
55 | ////////////////////////////////////////////////////////////////////////// | |
56 | ||
57 | template< typename T, std::size_t sz > | |
58 | struct range_const_iterator_helper< T[sz] > | |
59 | { | |
60 | typedef const T* type; | |
61 | }; | |
62 | ||
63 | } // namespace range_detail | |
64 | ||
65 | template<typename C, typename Enabler=void> | |
66 | struct range_const_iterator | |
67 | : range_detail::range_const_iterator_helper< | |
68 | BOOST_DEDUCED_TYPENAME remove_reference<C>::type | |
69 | > | |
70 | { | |
71 | }; | |
72 | ||
73 | } // namespace boost | |
74 | ||
75 | ||
76 | #endif |