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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_SIZE_TYPE_HPP | |
12 | #define BOOST_RANGE_SIZE_TYPE_HPP | |
13 | ||
14 | #if defined(_MSC_VER) | |
15 | # pragma once | |
16 | #endif | |
17 | ||
18 | #include <boost/range/config.hpp> | |
19 | #include <boost/range/difference_type.hpp> | |
20 | #include <boost/range/concepts.hpp> | |
21 | #include <boost/range/has_range_iterator.hpp> | |
22 | ||
23 | #include <boost/utility/enable_if.hpp> | |
24 | #include <boost/type_traits/make_unsigned.hpp> | |
25 | #include <boost/type_traits/remove_const.hpp> | |
26 | #include <cstddef> | |
27 | #include <utility> | |
28 | ||
29 | namespace boost | |
30 | { | |
31 | namespace detail | |
32 | { | |
33 | ||
34 | ////////////////////////////////////////////////////////////////////////// | |
35 | // default | |
36 | ////////////////////////////////////////////////////////////////////////// | |
37 | ||
38 | template<typename T> | |
39 | class has_size_type | |
40 | { | |
41 | typedef char no_type; | |
42 | struct yes_type { char dummy[2]; }; | |
43 | ||
44 | template<typename C> | |
45 | static yes_type test(BOOST_DEDUCED_TYPENAME C::size_type x); | |
46 | ||
47 | template<typename C> | |
48 | static no_type test(...); | |
49 | ||
50 | public: | |
51 | static const bool value = sizeof(test<T>(0)) == sizeof(yes_type); | |
52 | }; | |
53 | ||
54 | template<typename C, typename Enabler=void> | |
55 | struct range_size_ | |
56 | { | |
57 | typedef BOOST_DEDUCED_TYPENAME make_unsigned< | |
58 | BOOST_DEDUCED_TYPENAME range_difference<C>::type | |
59 | >::type type; | |
60 | }; | |
61 | ||
62 | template<typename C> | |
63 | struct range_size_< | |
64 | C, | |
65 | BOOST_DEDUCED_TYPENAME ::boost::enable_if<has_size_type<C>, void>::type | |
66 | > | |
67 | { | |
68 | typedef BOOST_DEDUCED_TYPENAME C::size_type type; | |
69 | }; | |
70 | ||
71 | template<typename C, bool B = range_detail::has_type< range_iterator<C> >::value> | |
72 | struct range_size | |
73 | { }; | |
74 | ||
75 | template<typename C> | |
76 | struct range_size<C, true> | |
77 | : range_size_<C> | |
78 | { }; | |
79 | } | |
80 | ||
81 | template< class T > | |
82 | struct range_size : | |
83 | detail::range_size<T> | |
84 | { }; | |
85 | ||
86 | template< class T > | |
87 | struct range_size<const T > : | |
88 | detail::range_size<T> | |
89 | { }; | |
90 | ||
91 | } // namespace boost | |
92 | ||
93 | ||
94 | ||
95 | #endif |