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2001-09-17 Phil Edwards <pme@gcc.gnu.org> * docs/html/configopts.html: HTML to XHTML change. Lowercase tags. * docs/html/documentation.html: Likewise. * docs/html/explanations.html: Likewise. * docs/html/install.html: Likewise. * docs/html/17_intro/howto.html: Likewise. * docs/html/18_support/howto.html: Likewise. * docs/html/19_diagnostics/howto.html: Likewise. * docs/html/20_util/howto.html: Likewise. * docs/html/21_strings/howto.html: Likewise. * docs/html/22_locale/codecvt.html: Likewise. * docs/html/22_locale/ctype.html: Likewise. * docs/html/22_locale/howto.html: Likewise. * docs/html/22_locale/locale.html: Likewise. * docs/html/22_locale/messages.html: Likewise. * docs/html/23_containers/howto.html: Likewise. * docs/html/24_iterators/howto.html: Likewise. * docs/html/25_algorithms/howto.html: Likewise. * docs/html/26_numerics/howto.html: Likewise. * docs/html/27_io/howto.html: Likewise. * docs/html/ext/howto.html: Likewise. * docs/html/faq/index.html: Likewise. * docs/html/faq/index.txt: Regenerated. From-SVN: r45668
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3.4 KiB
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96 lines
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HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<html>
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<head>
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<meta HcodeP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<meta NAME="AUTHOR" CONTENT="pme@gcc.gnu.org (Phil Edwards)">
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<meta NAME="KEYWORDS" CONTENT="HOWTO, libstdc++, GCC, g++, libg++, STL">
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<meta NAME="DESCRIPTION" CONTENT="HOWTO for the libstdc++ chapter 25.">
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<meta NAME="GENERATOR" CONTENT="vi and eight fingers">
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<title>libstdc++-v3 HOWTO: Chapter 25</title>
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<link REL=StyleSheet HREF="../lib3styles.css">
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<!-- $Id: howto.html,v 1.4 2001/09/15 00:41:11 pme Exp $ -->
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</head>
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<body>
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<h1 CLASS="centered"><a name="top">Chapter 25: Algorithms</a></h1>
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<p>Chapter 25 deals with the generalized subroutines for automatically
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transforming lemmings into gold.
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</p>
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<hr>
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<h1>Contents</h1>
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<ul>
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<li><a href="#1">Prerequisites</a>
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<li><a href="#2">Topic</a>
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</ul>
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<hr>
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<h2><a name="1">Prerequisites</a></h2>
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<p>The neatest accomplishment of the algorithms chapter is that all the
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work is done via iterators, not containers directly. This means two
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important things:
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<ol>
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<li>Anything that behaves like an iterator can be used in one of
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these algorithms. Raw pointers make great candidates, thus
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built-in arrays are fine containers, as well as your own iterators.
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<li>The algorithms do not (and cannot) affect the container as a
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whole; only the things between the two iterator endpoints. If
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you pass a range of iterators only enclosing the middle third of
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a container, then anything outside that range is inviolate.
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</ol>
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</p>
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<p>Even strings can be fed through the algorithms here, although the
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string class has specialized versions of many of these functions (for
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example, <code>string::find()</code>). Most of the examples on this
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page will use simple arrays of integers as a playground for
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algorithms, just to keep things simple.
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<a name="Nsize">The use of <B>N</B></a> as a size in the examples is
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to keep things easy to read but probably won't be legal code. You can
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use wrappers such as those described in the
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<a href="../23_containers/howto.html">containers chapter</a> to keep
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real code readable.
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</p>
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<p>The single thing that trips people up the most is the definition of
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<em>range</em> used with iterators; the famous
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"past-the-end" rule that everybody loves to hate. The
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<a href="../24_iterators/howto.html#2">iterators chapter</a> of this
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document has a complete explanation of this simple rule that seems to
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cause so much confusion. Once you get <em>range</em> into your head
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(it's not that hard, honest!), then the algorithms are a cakewalk.
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</p>
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<p>
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</p>
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<p>Return <a href="#top">to top of page</a> or
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<a href="../faq/index.html">to the FAQ</a>.
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</p>
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<hr>
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<h2><a name="2">Topic</a></h2>
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<p>Blah.
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</p>
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<p>Return <a href="#top">to top of page</a> or
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<a href="../faq/index.html">to the FAQ</a>.
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</p>
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<hr>
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<P CLASS="fineprint"><em>
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Comments and suggestions are welcome, and may be sent to
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<a href="mailto:libstdc++@gcc.gnu.org">the mailing list</a>.
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<br> $Id: howto.html,v 1.4 2001/09/15 00:41:11 pme Exp $
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</em></p>
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</body>
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</html>
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