1 // Boost.Range library
2 //
3 //  Copyright Thorsten Ottosen 2003-2006. 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_DISTANCE_HPP
12 #define BOOST_RANGE_DISTANCE_HPP
13 
14 #if defined(_MSC_VER)
15 # pragma once
16 #endif
17 
18 #include <boost/iterator/distance.hpp>
19 #include <boost/range/begin.hpp>
20 #include <boost/range/end.hpp>
21 #include <boost/range/difference_type.hpp>
22 
23 namespace boost
24 {
25 
26     namespace range_distance_adl_barrier
27     {
28         template< class T >
29         inline BOOST_CXX14_CONSTEXPR BOOST_DEDUCED_TYPENAME range_difference<T>::type
distance(const T & r)30         distance( const T& r )
31         {
32             return boost::iterators::distance( boost::begin( r ), boost::end( r ) );
33         }
34     }
35 
36     using namespace range_distance_adl_barrier;
37 
38 } // namespace 'boost'
39 
40 #endif
41