// (C) Copyright David Abrahams and Jeremy Siek 2000-2001.

// Distributed under 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)

//

// Revision History:

// 04 Jan 2001  Factored counting_iterator stuff into

//              boost/counting_iterator.hpp (David Abrahams)

#ifndef BOOST_INTEGER_RANGE_HPP_

#define BOOST_INTEGER_RANGE_HPP_

#include <boost/config.hpp>

#include <boost/iterator/counting_iterator.hpp>

#include <algorithm>

namespace boost {

//=============================================================================

// Counting Iterator and Integer Range Class

template <class IntegerType>

struct integer_range {

    typedef counting_iterator<IntegerType> iterator;

    typedef iterator const_iterator;

    typedef IntegerType value_type;

    typedef std::ptrdiff_t difference_type;

    typedef IntegerType reference;

    typedef IntegerType const_reference;

    typedef const IntegerType* pointer;

    typedef const IntegerType* const_pointer;

    typedef IntegerType size_type;

    integer_range(IntegerType start, IntegerType finish)

        : m_start(start), m_finish(finish) { }

    iterator begin() const { return iterator(m_start); }

    iterator end() const { return iterator(m_finish); }

    size_type size() const { return m_finish - m_start; }

    bool empty() const { return m_finish == m_start; }

    void swap(integer_range& x) {

        std::swap(m_start, x.m_start);

        std::swap(m_finish, x.m_finish);

    }

protected:

    IntegerType m_start, m_finish;

};

template <class IntegerType>

inline integer_range<IntegerType>

make_integer_range(IntegerType first, IntegerType last)

{

  return integer_range<IntegerType>(first, last);

}

} // namespace boost

#endif // BOOST_INTEGER_RANGE_HPP_