/Src/Dependencies/Boost/boost/range/size.hpp

 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_HPP
12#define BOOST_RANGE_SIZE_HPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1200)
15# pragma once
16#endif
17
18#include <boost/range/config.hpp>
19#include <boost/range/begin.hpp>
20#include <boost/range/end.hpp>
21#include <boost/range/difference_type.hpp>
22#include <boost/assert.hpp>
23
24namespace boost
25{
26    namespace range_detail
27    {
28        template<class SinglePassRange>
29        inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
30        range_calculate_size(const SinglePassRange& rng)
31        {
32            BOOST_ASSERT( (boost::end(rng) - boost::begin(rng)) >= 0 &&
33                          "reachability invariant broken!" );
34            return boost::end(rng) - boost::begin(rng);
35        }
36    }
37
38    template<class SinglePassRange>
39    inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
40    size(const SinglePassRange& rng)
41    {
42#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \
43    !BOOST_WORKAROUND(__GNUC__, < 3) \
44    /**/
45        using namespace range_detail;
46#endif
47        return range_calculate_size(rng);
48    }
49
50} // namespace 'boost'
51
52#endif