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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Loki: Visitor Class Reference</title>
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<h1>Visitor Class Reference<br>
<small>
[<a class="el" href="a00227.html">Visitor</a>]</small>
</h1><!-- doxytag: class="Visitor" --><code>#include <Visitor.h></code>
<p>
<div class="dynheader">
Inheritance diagram for Visitor:</div>
<div class="dynsection">
<center><font size="2">[<a target="top" href="graph_legend.html">legend</a>]</font></center></div>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
The building block of Acyclic <a class="el" href="a00142.html">Visitor</a><p>
<dl class="user" compact><dt><b>Usage</b></dt><dd></dd></dl>
Defining the visitable class:<p>
<div class="fragment"><pre class="fragment"> <span class="keyword">class </span>RasterBitmap : <span class="keyword">public</span> BaseVisitable<>
{
<span class="keyword">public</span>:
<a class="code" href="a00227.html#g2b6ed280714eca44a2713d3cee5b2093">LOKI_DEFINE_VISITABLE</a>()
};
</pre></div><p>
Way 1 to define a visitor: <div class="fragment"><pre class="fragment"> <span class="keyword">class </span>SomeVisitor :
<span class="keyword">public</span> BaseVisitor <span class="comment">// required</span>
<span class="keyword">public</span> <a class="code" href="a00142.html">Visitor</a><RasterBitmap>,
<span class="keyword">public</span> <a class="code" href="a00142.html">Visitor</a><Paragraph>
{
<span class="keyword">public</span>:
<span class="keywordtype">void</span> Visit(RasterBitmap&); <span class="comment">// visit a RasterBitmap</span>
<span class="keywordtype">void</span> Visit(Paragraph &); <span class="comment">// visit a Paragraph</span>
};
</pre></div><p>
Way 2 to define the visitor: <div class="fragment"><pre class="fragment"> <span class="keyword">class </span>SomeVisitor :
<span class="keyword">public</span> BaseVisitor <span class="comment">// required</span>
<span class="keyword">public</span> <a class="code" href="a00142.html">Visitor</a><LOKI_TYPELIST_2(RasterBitmap, Paragraph)>
{
<span class="keyword">public</span>:
<span class="keywordtype">void</span> Visit(RasterBitmap&); <span class="comment">// visit a RasterBitmap</span>
<span class="keywordtype">void</span> Visit(Paragraph &); <span class="comment">// visit a Paragraph</span>
};
</pre></div><p>
Way 3 to define the visitor: <div class="fragment"><pre class="fragment"> <span class="keyword">class </span>SomeVisitor :
<span class="keyword">public</span> BaseVisitor <span class="comment">// required</span>
<span class="keyword">public</span> <a class="code" href="a00142.html">Visitor</a><Seq<RasterBitmap, Paragraph>::Type>
{
<span class="keyword">public</span>:
<span class="keywordtype">void</span> Visit(RasterBitmap&); <span class="comment">// visit a RasterBitmap</span>
<span class="keywordtype">void</span> Visit(Paragraph &); <span class="comment">// visit a Paragraph</span>
};
</pre></div><p>
<dl class="user" compact><dt><b>Using const visit functions:</b></dt><dd></dd></dl>
Defining the visitable class (true for const):<p>
<div class="fragment"><pre class="fragment"> <span class="keyword">class </span>RasterBitmap : <span class="keyword">public</span> BaseVisitable<void, DefaultCatchAll, true>
{
<span class="keyword">public</span>:
<a class="code" href="a00227.html#g0d60fea385397a82b9d3b3d231517777">LOKI_DEFINE_CONST_VISITABLE</a>()
};
</pre></div><p>
Defining the visitor which only calls const member functions: <div class="fragment"><pre class="fragment"> <span class="keyword">class </span>SomeVisitor :
<span class="keyword">public</span> BaseVisitor <span class="comment">// required</span>
<span class="keyword">public</span> <a class="code" href="a00142.html">Visitor</a><RasterBitmap, void, true>,
{
<span class="keyword">public</span>:
<span class="keywordtype">void</span> Visit(<span class="keyword">const</span> RasterBitmap&); <span class="comment">// visit a RasterBitmap by a const member function</span>
};
</pre></div><p>
<dl class="user" compact><dt><b>Example:</b></dt><dd></dd></dl>
test/Visitor/main.cpp <hr>The documentation for this class was generated from the following file:<ul>
<li>Visitor.h</ul>
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