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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 27. Iterators</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.78.1" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="extensions.html" title="Part III.  Extensions" /><link rel="prev" href="ext_numerics.html" title="Chapter 26. Numerics" /><link rel="next" href="ext_io.html" title="Chapter 28. Input and Output" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 27. Iterators</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ext_numerics.html">Prev</a> </td><th width="60%" align="center">Part III. 
  Extensions
  
</th><td width="20%" align="right"> <a accesskey="n" href="ext_io.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.iterators"></a>Chapter 27. Iterators</h2></div></div></div><p>24.3.2 describes <code class="code">struct iterator</code>, which didn't exist in the
   original HP STL implementation (the language wasn't rich enough at the
   time).  For backwards compatibility, base classes are provided which
   declare the same nested typedefs:
</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>input_iterator</p></li><li class="listitem"><p>output_iterator</p></li><li class="listitem"><p>forward_iterator</p></li><li class="listitem"><p>bidirectional_iterator</p></li><li class="listitem"><p>random_access_iterator</p></li></ul></div><p>24.3.4 describes iterator operation <code class="code">distance</code>, which takes
   two iterators and returns a result.  It is extended by another signature
   which takes two iterators and a reference to a result.  The result is
   modified, and the function returns nothing.
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