<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>View</title> <link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../index.html" title="Chapter 1. Fusion 2.0"> <link rel="prev" href="container/conversion/metafunctions/as_map.html" title="as_map"> <link rel="next" href="view/single_view.html" title="single_view"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> <td align="center"><a href="../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="container/conversion/metafunctions/as_map.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="view/single_view.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="fusion.view"></a><a class="link" href="view.html" title="View">View</a> </h2></div></div></div> <div class="toc"><dl> <dt><span class="section"><a href="view/single_view.html">single_view</a></span></dt> <dt><span class="section"><a href="view/filter_view.html">filter_view</a></span></dt> <dt><span class="section"><a href="view/iterator_range.html">iterator_range</a></span></dt> <dt><span class="section"><a href="view/joint_view.html">joint_view</a></span></dt> <dt><span class="section"><a href="view/zip_view.html">zip_view</a></span></dt> <dt><span class="section"><a href="view/transform_view.html">transform_view</a></span></dt> <dt><span class="section"><a href="view/reverse_view.html">reverse_view</a></span></dt> <dt><span class="section"><a href="view/nview.html">nview</a></span></dt> <dt><span class="section"><a href="view/repetitive_view.html">repetitive_view</a></span></dt> </dl></div> <p> Views are sequences that do not actually contain data, but instead impart an alternative presentation over the data from one or more underlying sequences. Views are proxies. They provide an efficient yet purely functional way to work on potentially expensive sequence operations. Views are inherently lazy. Their elements are only computed on demand only when the elements of the underlying sequence(s) are actually accessed. Views' lazy nature make them very cheap to copy and be passed around by value. </p> <a name="fusion.view.header"></a><h4> <a name="id989683"></a> <a class="link" href="view.html#fusion.view.header">Header</a> </h4> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias Schwinger<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="container/conversion/metafunctions/as_map.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="view/single_view.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>