ceph/src/boost/libs/iterator/doc/reverse_iterator_eg.rst

   1 .. Copyright David Abrahams 2006. Distributed under the Boost
   2 .. Software License, Version 1.0. (See accompanying
   3 .. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4
   5 Example
   6 .......
   7
   8 The following example prints an array of characters in reverse order
   9 using ``reverse_iterator``.
  10
  11 ::
  12
  13     char letters_[] = "hello world!";
  14     const int N = sizeof(letters_)/sizeof(char) - 1;
  15     typedef char* base_iterator;
  16     base_iterator letters(letters_);
  17     std::cout << "original sequence of letters:\t\t\t" << letters_ << std::endl;
  18
  19     boost::reverse_iterator<base_iterator>
  20       reverse_letters_first(letters + N),
  21       reverse_letters_last(letters);
  22
  23     std::cout << "sequence in reverse order:\t\t\t";
  24     std::copy(reverse_letters_first, reverse_letters_last,
  25               std::ostream_iterator<char>(std::cout));
  26     std::cout << std::endl;
  27
  28     std::cout << "sequence in double-reversed (normal) order:\t";
  29     std::copy(boost::make_reverse_iterator(reverse_letters_last),
  30               boost::make_reverse_iterator(reverse_letters_first),
  31               std::ostream_iterator<char>(std::cout));
  32     std::cout << std::endl;
  33
  34
  35
  36 The output is::
  37
  38     original sequence of letters:                   hello world!
  39     sequence in reverse order:                      !dlrow olleh
  40     sequence in double-reversed (normal) order:     hello world!
  41
  42
  43 The source code for this example can be found `here`__.
  44
  45 __ ../example/reverse_iterator_example.cpp