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1 | // Boost.Range library |
2 | // | |
3 | // Copyright Neil Groves 2010. 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 | // Acknowledgments: | |
11 | // Ticket #8341: Arno Schoedl - improved handling of has_range_iterator upon | |
12 | // use-cases where T was const. | |
13 | #ifndef BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED | |
14 | #define BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED | |
15 | ||
16 | #include <boost/mpl/bool.hpp> | |
17 | #include <boost/mpl/eval_if.hpp> | |
18 | #include <boost/mpl/has_xxx.hpp> | |
19 | #include <boost/range/iterator.hpp> | |
20 | #include <boost/type_traits/remove_reference.hpp> | |
21 | #include <boost/utility/enable_if.hpp> | |
22 | ||
23 | namespace boost | |
24 | { | |
25 | namespace range_detail | |
26 | { | |
27 | BOOST_MPL_HAS_XXX_TRAIT_DEF(type) | |
28 | ||
29 | template<class T, class Enabler = void> | |
30 | struct has_range_iterator_impl | |
31 | : boost::mpl::false_ | |
32 | { | |
33 | }; | |
34 | ||
35 | template<class T> | |
36 | struct has_range_iterator_impl< | |
37 | T, | |
38 | BOOST_DEDUCED_TYPENAME ::boost::enable_if< | |
39 | BOOST_DEDUCED_TYPENAME mpl::eval_if<is_const<T>, | |
40 | has_type<range_const_iterator< | |
41 | BOOST_DEDUCED_TYPENAME remove_const<T>::type> >, | |
42 | has_type<range_mutable_iterator<T> > | |
43 | >::type | |
44 | >::type | |
45 | > | |
46 | : boost::mpl::true_ | |
47 | { | |
48 | }; | |
49 | ||
50 | template<class T, class Enabler = void> | |
51 | struct has_range_const_iterator_impl | |
52 | : boost::mpl::false_ | |
53 | { | |
54 | }; | |
55 | ||
56 | template<class T> | |
57 | struct has_range_const_iterator_impl< | |
58 | T, | |
59 | BOOST_DEDUCED_TYPENAME ::boost::enable_if< | |
60 | has_type<range_const_iterator<T> > | |
61 | >::type | |
62 | > | |
63 | : boost::mpl::true_ | |
64 | { | |
65 | }; | |
66 | ||
67 | } // namespace range_detail | |
68 | ||
69 | template<class T> | |
70 | struct has_range_iterator | |
71 | : range_detail::has_range_iterator_impl< | |
72 | BOOST_DEDUCED_TYPENAME remove_reference<T>::type> | |
73 | {}; | |
74 | ||
75 | template<class T> | |
76 | struct has_range_const_iterator | |
77 | : range_detail::has_range_const_iterator_impl< | |
78 | BOOST_DEDUCED_TYPENAME remove_reference<T>::type> | |
79 | {}; | |
80 | } // namespace boost | |
81 | ||
82 | #endif // include guard | |
83 |