<?xml version="1.0" encoding="utf-8" ?> <!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" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> <title>The MPL Reference Manual: Views</title> <link rel="stylesheet" href="../style.css" type="text/css" /> </head> <body class="docframe refmanual"> <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./string.html" class="navigation-link">Prev</a> <a href="./empty-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./classes.html" class="navigation-link">Back</a> <a href="./intrinsic-metafunctions.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./sequences.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a></td> </tr></table><div class="header-separator"></div> <div class="section" id="views"> <h1><a class="toc-backref" href="./sequences.html#id1416">Views</a></h1> <p id="label-sequences-views">A <em>view</em> is a sequence adaptor delivering an altered presentation of one or more underlying sequences. Views are lazy, meaning that their elements are only computed on demand. Similarly to the short-circuit <a class="reference internal" href="./logical-operations.html">logical operations</a> and <a class="reference internal" href="./eval-if.html">eval_if</a>, views make it possible to avoid premature errors and inefficiencies from computations whose results will never be used. When approached with views in mind, many algorithmic problems can be solved in a simpler, more conceptually precise, more expressive way.</p> <!-- Sequences/Views//empty_sequence --> <ul class="toc simple" id="outline"> <li><a class="reference internal" href="./empty-sequence.html" id="id1417">empty_sequence</a></li> <li><a class="reference internal" href="./filter-view.html" id="id1418">filter_view</a></li> <li><a class="reference internal" href="./iterator-range.html" id="id1419">iterator_range</a></li> <li><a class="reference internal" href="./joint-view.html" id="id1420">joint_view</a></li> <li><a class="reference internal" href="./single-view.html" id="id1421">single_view</a></li> <li><a class="reference internal" href="./transform-view.html" id="id1422">transform_view</a></li> <li><a class="reference internal" href="./zip-view.html" id="id1423">zip_view</a></li> </ul> </div> <div class="footer-separator"></div> <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./string.html" class="navigation-link">Prev</a> <a href="./empty-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./classes.html" class="navigation-link">Back</a> <a href="./intrinsic-metafunctions.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./sequences.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> </html>