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// Boost.Range library
//
// Copyright Thorsten Ottosen 2003-2004. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_SIZE_HPP
#define BOOST_RANGE_SIZE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#include <boost/range/config.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/difference_type.hpp>
#include <boost/assert.hpp>
namespace boost
{
namespace range_detail
{
template<class SinglePassRange>
inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
range_calculate_size(const SinglePassRange& rng)
{
BOOST_ASSERT( (boost::end(rng) - boost::begin(rng)) >= 0 &&
"reachability invariant broken!" );
return boost::end(rng) - boost::begin(rng);
}
}
template<class SinglePassRange>
inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
size(const SinglePassRange& rng)
{
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \
!BOOST_WORKAROUND(__GNUC__, < 3) \
/**/
using namespace range_detail;
#endif
return range_calculate_size(rng);
}
} // namespace 'boost'
#endif
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