ceph/src/boost/libs/iterator/example/reverse_iterator_example.cpp

   1 // (C) Copyright Jeremy Siek 2000-2004.
   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 #include <boost/config.hpp>
   7 #include <iostream>
   8 #include <algorithm>
   9 #include <boost/iterator/reverse_iterator.hpp>
  10 #include <boost/cstdlib.hpp>
  11
  12 int main(int, char*[])
  13 {
  14   char letters_[] = "hello world!";
  15   const int N = sizeof(letters_)/sizeof(char) - 1;
  16   typedef char* base_iterator;
  17   base_iterator letters(letters_);
  18
  19   std::cout << "original sequence of letters:\t\t\t"
  20             << letters_ << std::endl;
  21
  22   // Use reverse_iterator to print a sequence of letters in reverse
  23   // order.
  24
  25   boost::reverse_iterator<base_iterator>
  26     reverse_letters_first(letters + N),
  27     reverse_letters_last(letters);
  28
  29   std::cout << "sequence in reverse order:\t\t\t";
  30   std::copy(reverse_letters_first, reverse_letters_last,
  31             std::ostream_iterator<char>(std::cout));
  32   std::cout << std::endl;
  33
  34   std::cout << "sequence in double-reversed (normal) order:\t";
  35   std::copy(boost::make_reverse_iterator(reverse_letters_last),
  36             boost::make_reverse_iterator(reverse_letters_first),
  37             std::ostream_iterator<char>(std::cout));
  38   std::cout << std::endl;
  39
  40   return boost::exit_success;
  41 }