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<title>Boost.Flyweight Documentation - Tags reference</title>
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<h1><img src="../../../../boost.png" alt="Boost logo" align=
"middle" width="277" height="86">Boost.Flyweight
Tags reference</h1>

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<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&lt;T&gt;</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>&lt;</span><span class=keyword>typename</span> <span class=identifier>T</span><span class=special>&gt;</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&lt;T&gt;</code> is a suitable
<a href="#tag">tag</a> for use in instantiations of
<a href="flyweight.html#flyweight"><code>flyweight</code></a>.
</p>

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<p>Revised August 11th 2008</p>

<p>&copy; Copyright 2006-2008 Joaqu&iacute;n M L&oacute;pez Mu&ntilde;oz.
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>)
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