<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template visitor_ptr_t</title> <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../variant/reference.html#header.boost.variant.visitor_ptr_hpp" title="Header <boost/variant/visitor_ptr.hpp>"> <link rel="prev" href="static_visitor.html" title="Class template static_visitor"> <link rel="next" href="visitor_ptr.html" title="Function template visitor_ptr"> </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" 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class="refnamediv"> <h2><span class="refentrytitle">Class template visitor_ptr_t</span></h2> <p>boost::visitor_ptr_t — Adapts a function pointer for use as a static visitor.</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../variant/reference.html#header.boost.variant.visitor_ptr_hpp" title="Header <boost/variant/visitor_ptr.hpp>">boost/variant/visitor_ptr.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> R<span class="special">></span> <span class="keyword">class</span> <a class="link" href="visitor_ptr_t.html" title="Class template visitor_ptr_t">visitor_ptr_t</a> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="static_visitor.html" title="Class template static_visitor">static_visitor</a><span class="special"><</span><span class="identifier">R</span><span class="special">></span> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// <a class="link" href="visitor_ptr_t.html#boost.visitor_ptr_tconstruct-copy-destruct">construct/copy/destruct</a></span> <span class="keyword">explicit</span> <a class="link" href="visitor_ptr_t.html#idm45506898693568-bb"><span class="identifier">visitor_ptr_t</span></a><span class="special">(</span><span class="identifier">R</span> <span class="special">(</span><span class="special">*</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="visitor_ptr_t.html#idm45506891571536-bb">static visitor interfaces</a></span> <span class="identifier">R</span> <a class="link" href="visitor_ptr_t.html#idm45506891570560-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">forwarding</span><span class="special">-</span><span class="identifier">type</span></em></span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">void</span> <a class="link" href="visitor_ptr_t.html#idm45506845000656-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">U</span><span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555030362528"></a><h2>Description</h2> <p>Adapts the function given at construction for use as a <a class="link" href="../variant/reference.html#variant.concepts.static-visitor" title="StaticVisitor">static visitor</a> of type <code class="computeroutput">T</code> with result type <code class="computeroutput">R</code>.</p> <div class="refsect2"> <a name="idm45555030359264"></a><h3> <a name="boost.visitor_ptr_tconstruct-copy-destruct"></a><code class="computeroutput">visitor_ptr_t</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45506898693568-bb"></a><span class="identifier">visitor_ptr_t</span><span class="special">(</span><span class="identifier">R</span> <span class="special">(</span><span class="special">*</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Effects:</span></p></td> <td>Constructs the visitor with the given function.</td> </tr></tbody> </table></div> </li></ol></div> </div> <div class="refsect2"> <a name="idm45555030347376"></a><h3> <a name="idm45506891571536-bb"></a><code class="computeroutput">visitor_ptr_t</code> static visitor interfaces</h3> <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> <pre class="literallayout"><a name="idm45506891571120-bb"></a><span class="identifier">R</span> <a name="idm45506891570560-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">forwarding</span><span class="special">-</span><span class="identifier">type</span></em></span> operand<span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">void</span> <a name="idm45506845000656-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">U</span><span class="special">&</span><span class="special">)</span><span class="special">;</span></pre> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Effects:</span></p></td> <td>If passed a value or reference of type <code class="computeroutput">T</code>, it invokes the function given at construction, appropriately forwarding <code class="computeroutput">operand</code>.</td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td>Returns the result of the function invocation.</td> </tr> <tr> <td><p><span class="term">Throws:</span></p></td> <td>The overload taking a value or reference of type <code class="computeroutput">T</code> throws if the invoked function throws. The overload taking all other values <span class="emphasis"><em>always</em></span> throws <code class="computeroutput"><a class="link" href="bad_visit.html" title="Class bad_visit">bad_visit</a></code>.</td> </tr> </tbody> </table></div> </li></ol></div> </div> </div> </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 © 2002, 2003 Eric Friedman, Itay Maman<p>Distributed under the Boost Software License, Version 1.0. (See accompanying file <code class="filename">LICENSE_1_0.txt</code> 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="static_visitor.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../variant/reference.html#header.boost.variant.visitor_ptr_hpp"><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="visitor_ptr.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>