boost_range/include/boost/range/sub_range.hpp

// 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_SUB_RANGE_HPP
#define BOOST_RANGE_SUB_RANGE_HPP

#include <boost/range/config.hpp>
#include <boost/range/iterator_range.hpp>
#include <boost/range/result_iterator.hpp>
#include <boost/range/size_type.hpp>
#include <boost/range/difference_type.hpp>

namespace boost
{
    
    template< class ForwardRange > 
    class sub_range : public iterator_range< BOOST_DEDUCED_TYPENAME result_iterator_of<ForwardRange>::type > 
    {
        typedef BOOST_DEDUCED_TYPENAME result_iterator_of<ForwardRange>::type iterator_t;
        typedef iterator_range< iterator_t  > base;
        
    public:
        using BOOST_DEDUCED_TYPENAME base::value_type;
        using BOOST_DEDUCED_TYPENAME base::iterator;
        typedef BOOST_DEDUCED_TYPENAME const_iterator_of<ForwardRange>::type     const_iterator;
        typedef BOOST_DEDUCED_TYPENAME difference_type_of<ForwardRange>::type  difference_type;
        typedef BOOST_DEDUCED_TYPENAME size_type_of<ForwardRange>::type        size_type;

    public:
        template< class ForwardRange2 >
        sub_range( ForwardRange2& r ) : base( r )
        { }
        
        template< class ForwardRange2 >
        sub_range( const ForwardRange2& r ) : base( r )
        { }

        template< class Iter >
        sub_range( Iter first, Iter last ) :
            base( first, last )
        { }
        
        template< class ForwardRange2 >
        sub_range& operator=( ForwardRange2& r )
        {
            base::operator=( r );
            return *this;
        }

        template< class ForwardRange2 >
        sub_range& operator=( const ForwardRange2& r )
        {
            base::operator=( r );
            return *this;
        }
        
    public:
        
        iterator        begin()          { return base::begin(); }
        const_iterator  begin() const    { return base::begin(); }
        iterator        end()            { return base::end();   }
        const_iterator  end() const      { return base::end();   }
        size_type       size() const     { return std::distance( begin(), end() ); }   

    };
        
} // namespace 'boost'

#endif