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<title>Class template apply_visitor_delayed_t</title>
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<div class="refentry" title="Class template apply_visitor_delayed_t">
<a name="boost.apply_visitor_delayed_t"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template apply_visitor_delayed_t</span></h2>
<p>boost::apply_visitor_delayed_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="emphasis"><em>// 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>>
</em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Visitor>
<span class="bold"><strong>class</strong></span> <a class="link" href="apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a> {
<span class="bold"><strong>public</strong></span>:
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>typename</strong></span> Visitor::result_type <a name="boost.apply_visitor_delayed_t.result_type"></a>result_type;
<span class="emphasis"><em>// <a class="link" href="apply_visitor_delayed_t.html#boost.apply_visitor_delayed_tconstruct-copy-destruct">construct/copy/destruct</a></em></span>
<span class="bold"><strong>explicit</strong></span> <a class="link" href="apply_visitor_delayed_t.html#id1134221-bb">apply_visitor_delayed_t</a>(Visitor &);
<span class="emphasis"><em>// <a class="link" href="apply_visitor_delayed_t.html#id1343692-bb">function object interface</a></em></span>
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Variant> <span class="type">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#id1343699-bb"><span class="bold"><strong>operator</strong></span>()</a>(Variant &);
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Variant1, <span class="bold"><strong>typename</strong></span> Variant2>
<span class="type">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#id1136135-bb"><span class="bold"><strong>operator</strong></span>()</a>(Variant1 &, Variant2 &);
};</pre></div>
<div class="refsect1" title="Description">
<a name="id2048568"></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>
<div class="refsect2" title="apply_visitor_delayed_t public construct/copy/destruct">
<a name="id2048606"></a><h3>
<a name="boost.apply_visitor_delayed_tconstruct-copy-destruct"></a><code class="computeroutput">apply_visitor_delayed_t</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="bold"><strong>explicit</strong></span> <a name="id1134221-bb"></a>apply_visitor_delayed_t(Visitor & visitor);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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" title="apply_visitor_delayed_t function object interface">
<a name="id2048661"></a><h3>
<a name="id1343692-bb"></a><code class="computeroutput">apply_visitor_delayed_t</code> function object interface</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="id1343695-bb"></a><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Variant> <span class="type">result_type</span> <a name="id1343699-bb"></a><span class="bold"><strong>operator</strong></span>()(Variant & operand);
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Variant1, <span class="bold"><strong>typename</strong></span> Variant2>
<span class="type">result_type</span> <a name="id1136135-bb"></a><span class="bold"><strong>operator</strong></span>()(Variant1 & operand1, Variant2 & operand2);</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>
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<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>)
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