boost/pending/integer_range.hpp

   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_