<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0.1 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Boost.Flyweight Documentation - Tags reference</title> <link rel="stylesheet" href="../style.css" type="text/css"> <link rel="start" href="../index.html"> <link rel="prev" href="key_value.html"> <link rel="up" href="index.html"> <link rel="next" href="factories.html"> </head> <body> <h1><img src="../../../../boost.png" alt="Boost logo" align= "middle" width="277" height="86">Boost.Flyweight Tags reference</h1> <div class="prev_link"><a href="key_value.html"><img src="../prev.gif" alt="key-value flyweights" border="0"><br> Key-value flyweights </a></div> <div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.Flyweight reference" border="0"><br> Boost.Flyweight reference </a></div> <div class="next_link"><a href="factories.html"><img src="../next.gif" alt="factories" border="0"><br> Factories </a></div><br clear="all" style="clear: all;"> <hr> <h2>Contents</h2> <ul> <li><a href="#tag">Tags</a></li> <li><a href="#tag_synopsis">Header <code>"boost/flyweight/tag.hpp"</code> synopsis</a> <ul> <li><a href="#tag_construct">Class template <code>tag</code></a></li> </ul> </li> </ul> <h2><a name="tag">Tags</a></h2> <p> A <i>tag</i> is a type of the form <a href="#tag_construct"><code>tag<T></code></a> for some arbitrary <code>T</code>. In the context of Boost.Flyweight, tags are syntactic artifacts used to differentiate instantiations of the class template <a href="flyweight.html#flyweight"><code>flyweight</code></a> which would otherwise be identical. Tagging a <code>flyweight</code> instantiation with a tag type local to a given context ensures that the global resources of that instantiation (for instance, the associated <a href="factories.html#factory">factory class</a>) will not be unintentionally shared by other areas of the program. </p> <h2><a name="tag_synopsis">Header <a href="../../../../boost/flyweight/tag.hpp"><code>"boost/flyweight/tag.hpp"</code></a> synopsis</a></h2> <blockquote><pre> <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span> <span class=keyword>namespace</span> <span class=identifier>flyweights</span><span class=special>{</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>T</span><span class=special>></span> <span class=keyword>struct</span> <span class=identifier>tag</span><span class=special>;</span> <span class=special>}</span> <span class=comment>// namespace boost::flyweights</span> <span class=special>}</span> <span class=comment>// namespace boost</span> </pre></blockquote> <h3><a name="tag_construct">Class template <code>tag</code></a></h3> <p> For any type <code>T</code>, <code>tag<T></code> is a suitable <a href="#tag">tag</a> for use in instantiations of <a href="flyweight.html#flyweight"><code>flyweight</code></a>. </p> <hr> <div class="prev_link"><a href="key_value.html"><img src="../prev.gif" alt="key-value flyweights" border="0"><br> Key-value flyweights </a></div> <div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.Flyweight reference" border="0"><br> Boost.Flyweight reference </a></div> <div class="next_link"><a href="factories.html"><img src="../next.gif" alt="factories" border="0"><br> Factories </a></div><br clear="all" style="clear: all;"> <br> <p>Revised August 11th 2008</p> <p>© Copyright 2006-2008 Joaquín M López Muñoz. Distributed under the Boost Software License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt"> LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt"> http://www.boost.org/LICENSE_1_0.txt</a>) </p> </body> </html>