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
25namespace 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
48