-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Chapter 10. Iterators</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><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="bk01pt02.html" title="Part II. Standard Contents"/><link rel="prev" href="containers_and_c.html" title="Interacting with C"/><link rel="next" href="algorithms.html" title="Chapter 11. Algorithms"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 10.
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 10. Iterators</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><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="bk01pt02.html" title="Part II. Standard Contents"><link rel="prev" href="containers_and_c.html" title="Interacting with C"><link rel="next" href="algorithms.html" title="Chapter 11. Algorithms"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 10.
Iterators
-</th></tr><tr><td align="left"><a accesskey="p" href="containers_and_c.html">Prev</a> </td><th width="60%" align="center">Part II.
+</th></tr><tr><td
width="20%" align="left"><a accesskey="p" href="containers_and_c.html">Prev</a> </td><th width="60%" align="center">Part II.
Standard Contents
- </th><td align="right"> <a accesskey="n" href="algorithms.html">Next</a></td></tr></table><hr/></div><div class="chapter" title="Chapter 10. Iterators"><div class="titlepage"><div><div><h2 class="title"><a id="std.iterators"/>Chapter 10.
+ </th><td width="20%" align="right"> <a accesskey="n" href="algorithms.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 10. Iterators"><div class="titlepage"><div><div><h2 class="title"><a name="std.iterators"></a>Chapter 10.
Iterators
- <a id="id514908" class="indexterm"/>
-</h2></div></div></div><div class="toc"><p><
strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="iterators.html#std.iterators.predefined">Predefined</a></span></dt><dd><dl><dt><span class="section"><a href="iterators.html#iterators.predefined.vs_pointers">Iterators vs. Pointers</a></span></dt><dt><span class="section"><a href="iterators.html#iterators.predefined.end">One Past the End</a></span></dt></dl></dd></dl></div><div class="section" title="Predefined"><div class="titlepage"><div><div><h2 class="title"><a id="std.iterators.predefined"/>Predefined</h2></div></div></div><div class="section" title="Iterators vs. Pointers"><div class="titlepage"><div><div><h3 class="title"><a id="iterators.predefined.vs_pointers"/>Iterators vs. Pointers</h3></div></div></div><p>
+ <a class="indexterm" name="id628227"></a>
+</h2></div></div></div><div class="toc"><p><
b>Table of Contents</b></p><dl><dt><span class="section"><a href="iterators.html#std.iterators.predefined">Predefined</a></span></dt><dd><dl><dt><span class="section"><a href="iterators.html#iterators.predefined.vs_pointers">Iterators vs. Pointers</a></span></dt><dt><span class="section"><a href="iterators.html#iterators.predefined.end">One Past the End</a></span></dt></dl></dd></dl></div><div class="section" title="Predefined"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="std.iterators.predefined"></a>Predefined</h2></div></div></div><div class="section" title="Iterators vs. Pointers"><div class="titlepage"><div><div><h3 class="title"><a name="iterators.predefined.vs_pointers"></a>Iterators vs. Pointers</h3></div></div></div><p>
The following
FAQ <a class="link" href="../faq.html#faq.iterator_as_pod" title="7.1.">entry</a> points out that
iterators are not implemented as pointers. They are a generalization
down through inheritance, so while the compiler has to do work
looking up all the names, your runtime code does not. (This has
been a prime concern from the beginning.)
- </p></div><div class="section" title="One Past the End"><div class="titlepage"><div><div><h3 class="title"><a
id="iterators.predefined.end"/>One Past the End</h3></div></div></div><p>This starts off sounding complicated, but is actually very easy,
+ </p></div><div class="section" title="One Past the End"><div class="titlepage"><div><div><h3 class="title"><a
name="iterators.predefined.end"></a>One Past the End</h3></div></div></div><p>This starts off sounding complicated, but is actually very easy,
especially towards the end. Trust me.
</p><p>Beginners usually have a little trouble understand the whole
'past-the-end' thing, until they remember their early algebra classes
</p><p>First, some history, and a reminder of some of the funkier rules in
C and C++ for builtin arrays. The following rules have always been
true for both languages:
- </p><div class="orderedlist"><ol class="orderedlist"><li class="listitem"><p>You can point anywhere in the array, <span class="emphasis"><em>or to the first element
+ </p><div class="orderedlist"><ol class="orderedlist"
type="1"><li class="listitem"><p>You can point anywhere in the array, <span class="emphasis"><em>or to the first element
past the end of the array</em></span>. A pointer that points to one
past the end of the array is guaranteed to be as unique as a
pointer to somewhere inside the array, so that you can compare
sequences very simple to recognize: if the two endpoints compare
equal, then the {array, sequence, container, whatever} is empty.
</p><p>Just don't dereference <code class="code">end()</code>.
- </p></div></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="containers_and_c.html">Prev</a> </td><td align="center"><a accesskey="u" href="bk01pt02.html">Up</a></td><td align="right"> <a accesskey="n" href="algorithms.html">Next</a></td></tr><tr><td align="left" valign="top">Interacting with C </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Chapter 11.
+ </p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="containers_and_c.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="bk01pt02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="algorithms.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Interacting with C </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 11.
Algorithms
</td></tr></table></div></body></html>
projects / gcc.git / blobdiff