<!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 apply_visitor_delayed_cpp14_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.apply_visitor_hpp" title="Header <boost/variant/apply_visitor.hpp>"> <link rel="prev" href="apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t"> <link rel="next" href="apply_visitor.html" title="Function apply_visitor"> </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="apply_visitor_delayed_t.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../variant/reference.html#header.boost.variant.apply_visitor_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="apply_visitor.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.apply_vi_idm45507085892176"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Class template apply_visitor_delayed_cpp14_t</span></h2> <p>boost::apply_visitor_delayed_cpp14_t — Adapts a visitor for use as a function object.</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.apply_visitor_hpp" title="Header <boost/variant/apply_visitor.hpp>">boost/variant/apply_visitor.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Visitor<span class="special">></span> <span class="keyword">class</span> <a class="link" href="apply_vi_idm45507085892176.html" title="Class template apply_visitor_delayed_cpp14_t">apply_visitor_delayed_cpp14_t</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// <a class="link" href="apply_vi_idm45507085892176.html#boost.apply_vi_idm45507085892176construct-copy-destruct">construct/copy/destruct</a></span> <span class="keyword">explicit</span> <a class="link" href="apply_vi_idm45507085892176.html#idm45506885387984-bb"><span class="identifier">apply_visitor_delayed_cpp14_t</span></a><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="apply_vi_idm45507085892176.html#idm45506891014896-bb">function object interface</a></span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ... Variant<span class="special">></span> <span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <a class="link" href="apply_vi_idm45507085892176.html#idm45506886935312-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Variant</span><span class="special">&</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="idm45555031901744"></a><h2>Description</h2> <p>Adapts the function given at construction for use as a function object. This is useful, for example, when one needs to operate on each element of a sequence of variant objects using a standard library algorithm such as <code class="computeroutput">std::for_each</code>.</p> <p>See the "visitor-only" form of <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> for a simple way to create <code class="computeroutput">apply_visitor_delayed_t</code> objects.</p> <p>See <code class="computeroutput"><a class="link" href="apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a></code> which is used when <code class="computeroutput">Visitor</code> has <code class="computeroutput">result_type</code> typedef.</p> <p>Available only if macro <a class="link" href="../BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES.html" title="Macro BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES">BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES</a> is not defined and compiler supports <code class="computeroutput">decltype(auto)</code> and <code class="computeroutput">decltype(some-expression)</code>.</p> <div class="refsect2"> <a name="idm45555031891488"></a><h3> <a name="boost.apply_vi_idm45507085892176construct-copy-destruct"></a><code class="computeroutput">apply_visitor_delayed_cpp14_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="idm45506885387984-bb"></a><span class="identifier">apply_visitor_delayed_cpp14_t</span><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&</span> visitor<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 function object with the given visitor.</td> </tr></tbody> </table></div> </li></ol></div> </div> <div class="refsect2"> <a name="idm45555031881984"></a><h3> <a name="idm45506891014896-bb"></a><code class="computeroutput">apply_visitor_delayed_cpp14_t</code> function object interface</h3> <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> <pre class="literallayout"><a name="idm45506886935872-bb"></a><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ... Variant<span class="special">></span> <span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <a name="idm45506886935312-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Variant</span><span class="special">&</span><span class="special">...</span> operand<span class="special">)</span><span class="special">;</span></pre>Function call operator.<p class="simpara">Invokes <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> on the stored visitor using the given operands.</p> </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="apply_visitor_delayed_t.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../variant/reference.html#header.boost.variant.apply_visitor_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="apply_visitor.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>