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  26 <a name="boost.apply_visitor_delayed_t"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class template apply_visitor_delayed_t</span></h2>
  29 <p>boost::apply_visitor_delayed_t &#8212; Adapts a visitor for use as a function object.</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../variant/reference.html#header.boost.variant.apply_visitor_hpp" title="Header &lt;boost/variant/apply_visitor.hpp&gt;">boost/variant/apply_visitor.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Visitor<span class="special">&gt;</span>
  35 <span class="keyword">class</span> <a class="link" href="apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// types</span>
  38   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Visitor</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.apply_visitor_delayed_t.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
  39
  40   <span class="comment">// <a class="link" href="apply_visitor_delayed_t.html#boost.apply_visitor_delayed_tconstruct-copy-destruct">construct/copy/destruct</a></span>
  41   <span class="keyword">explicit</span> <a class="link" href="apply_visitor_delayed_t.html#idp230040336-bb"><span class="identifier">apply_visitor_delayed_t</span></a><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  42
  43   <span class="comment">// <a class="link" href="apply_visitor_delayed_t.html#idp306186352-bb">function object interface</a></span>
  44   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#idp155141072-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">&amp;</span><span class="special">)</span><span class="special">;</span>
  45   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">&gt;</span>
  46     <span class="identifier">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#idp147340416-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Variant1</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Variant2</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  47 <span class="special">}</span><span class="special">;</span></pre></div>
  48 <div class="refsect1">
  49 <a name="idp524392032"></a><h2>Description</h2>
  50 <p>Adapts the function given at construction for use as a
  51           function object. This is useful, for example, when one needs to
  52           operate on each element of a sequence of variant objects using a
  53           standard library algorithm such as
  54           <code class="computeroutput">std::for_each</code>.</p>
  55 <p>See the "visitor-only" form of
  56           <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> for a simple
  57           way to create <code class="computeroutput">apply_visitor_delayed_t</code> objects.</p>
  58 <div class="refsect2">
  59 <a name="idp524396336"></a><h3>
  60 <a name="boost.apply_visitor_delayed_tconstruct-copy-destruct"></a><code class="computeroutput">apply_visitor_delayed_t</code>
  61         public
  62        construct/copy/destruct</h3>
  63 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  64 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp230040336-bb"></a><span class="identifier">apply_visitor_delayed_t</span><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&amp;</span> visitor<span class="special">)</span><span class="special">;</span></pre>
  65 <div class="variablelist"><table border="0" class="variablelist compact">
  66 <colgroup>
  67 <col align="left" valign="top">
  68 <col>
  69 </colgroup>
  70 <tbody><tr>
  71 <td><p><span class="term">Effects:</span></p></td>
  72 <td>Constructs the function object with the given
  73             visitor.</td>
  74 </tr></tbody>
  75 </table></div>
  76 </li></ol></div>
  77 </div>
  78 <div class="refsect2">
  79 <a name="idp524405872"></a><h3>
  80 <a name="idp306186352-bb"></a><code class="computeroutput">apply_visitor_delayed_t</code> function object interface</h3>
  81 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  82 <pre class="literallayout"><a name="idp306186928-bb"></a><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a name="idp155141072-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">&amp;</span> operand<span class="special">)</span><span class="special">;</span>
  83 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">&gt;</span>
  84   <span class="identifier">result_type</span> <a name="idp147340416-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Variant1</span> <span class="special">&amp;</span> operand1<span class="special">,</span> <span class="identifier">Variant2</span> <span class="special">&amp;</span> operand2<span class="special">)</span><span class="special">;</span></pre>Function call operator.<p class="simpara">Invokes
  85             <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> on the
  86             stored visitor using the given operands.</p>
  87 </li></ol></div>
  88 </div>
  89 </div>
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  93 <td align="right"><div class="copyright-footer">Copyright &#169; 2002, 2003 Eric Friedman, Itay Maman<p>Distributed under the Boost Software License, Version 1.0.
  94     (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at
  95     <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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