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

     2 // Distributed under the Boost Software License, Version 1.0. (See

     3 // accompanying file LICENSE_1_0.txt or copy at

     4 // http://www.boost.org/LICENSE_1_0.txt)

     5 //

     6 // Revision History:

     7 // 04 Jan 2001  Factored counting_iterator stuff into

     8 //              boost/counting_iterator.hpp (David Abrahams)

     9 

    10 #ifndef BOOST_INTEGER_RANGE_HPP_

    11 #define BOOST_INTEGER_RANGE_HPP_

    12 

    13 #include <boost/config.hpp>

    14 #include <boost/iterator/counting_iterator.hpp>

    15 #include <algorithm>

    16 

    17 namespace boost {

    18 

    19 //=============================================================================

    20 // Counting Iterator and Integer Range Class

    21 

    22 template <class IntegerType>

    23 struct integer_range {

    24     typedef counting_iterator<IntegerType> iterator;

    25 

    26     typedef iterator const_iterator;

    27     typedef IntegerType value_type;

    28     typedef std::ptrdiff_t difference_type;

    29     typedef IntegerType reference;

    30     typedef IntegerType const_reference;

    31     typedef const IntegerType* pointer;

    32     typedef const IntegerType* const_pointer;

    33     typedef IntegerType size_type;

    34 

    35     integer_range(IntegerType start, IntegerType finish)

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

    37 

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

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

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

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

    42     void swap(integer_range& x) {

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

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

    45     }

    46 protected:

    47     IntegerType m_start, m_finish;

    48 };

    49 

    50 template <class IntegerType>

    51 inline integer_range<IntegerType>

    52 make_integer_range(IntegerType first, IntegerType last)

    53 {

    54   return integer_range<IntegerType>(first, last);

    55 }

    56 

    57 } // namespace boost

    58 

    59 #endif // BOOST_INTEGER_RANGE_HPP_