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
27namespace boost
28{
29 //////////////////////////////////////////////////////////////////////////
30 // default
31 //////////////////////////////////////////////////////////////////////////
32
33 namespace range_detail
34 {
35
36BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( const_iterator )
37
38template< typename C >
39struct range_const_iterator_helper
40 : extract_const_iterator<C>
41{};
42
43//////////////////////////////////////////////////////////////////////////
44// pair
45//////////////////////////////////////////////////////////////////////////
46
47template< typename Iterator >
48struct range_const_iterator_helper<std::pair<Iterator,Iterator> >
49{
50 typedef Iterator type;
51};
52
53//////////////////////////////////////////////////////////////////////////
54// array
55//////////////////////////////////////////////////////////////////////////
56
57template< typename T, std::size_t sz >
58struct range_const_iterator_helper< T[sz] >
59{
60 typedef const T* type;
61};
62
63 } // namespace range_detail
64
65template<typename C, typename Enabler=void>
66struct 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
77