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boost_range/include/boost/range/size.hpp

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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
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#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/difference_type.hpp>
#include <boost/assert.hpp>
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namespace boost
{
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template< class T >
inline BOOST_DEDUCED_TYPENAME range_difference<T>::type size( const T& r )
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{
BOOST_ASSERT( (boost::end( r ) - boost::begin( r )) >= 0 &&
"reachability invariant broken!" );
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return boost::end( r ) - boost::begin( r );
}
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} // namespace 'boost'
#endif