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<h1>openvrml::node_traverser Class Reference</h1>Traverse the children of each node in a node hierarchy only once.
<a href="#_details">More...</a>
<p>
<a href="classopenvrml_1_1node__traverser-members.html">List of all members.</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#a0">node_traverser</a> () throw (std::bad_alloc)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Construct. <a href="#a0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a1" doxytag="openvrml::node_traverser::~node_traverser" ></a>
virtual </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#a1">~node_traverser</a> ()=0 throw ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destroy. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#a2">traverse</a> (<a class="el" href="classopenvrml_1_1node.html">node</a> &n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traverse a node. <a href="#a2"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#a3">traverse</a> (const <a class="el" href="classopenvrml_1_1node__ptr.html">node_ptr</a> &<a class="el" href="classopenvrml_1_1node.html">node</a>)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traverse an sfnode. <a href="#a3"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#a4">traverse</a> (const std::vector< <a class="el" href="classopenvrml_1_1node__ptr.html">node_ptr</a> > &nodes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traverse an mfnode. <a href="#a4"></a><br><br></td></tr>
<tr><td colspan=2><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#b0">halt_traversal</a> () throw ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Halt the traversal. <a href="#b0"></a><br><br></td></tr>
<tr><td colspan=2><br><h2>Private Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#d0">node_traverser</a> (const <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> &)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Not implemented. <a href="#d0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> & </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#d1">operator=</a> (const <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> &)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Not implemented. <a href="#d1"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>virtual void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#d2">on_entering</a> (<a class="el" href="classopenvrml_1_1node.html">node</a> &n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Called for each node in the traversal <em>before</em> traversing the its descendants. <a href="#d2"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>virtual void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#d3">on_leaving</a> (<a class="el" href="classopenvrml_1_1node.html">node</a> &n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Called for each node in the traversal <em>after</em> traversing the its descendants. <a href="#d3"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#d4">do_traversal</a> (<a class="el" href="classopenvrml_1_1node.html">node</a> &n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traverse a node. <a href="#d4"></a><br><br></td></tr>
<tr><td colspan=2><br><h2>Private Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="r0" doxytag="openvrml::node_traverser::traversed_nodes" ></a>
std::set< <a class="el" href="classopenvrml_1_1node.html">node</a> * > </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#r0">traversed_nodes</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The set of nodes that have already been traversed. <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="r1" doxytag="openvrml::node_traverser::halt" ></a>
bool </td><td class="memItemRight" valign=bottom><a class="el" href="classopenvrml_1_1node__traverser.html#r1">halt</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Flag to indicate if the traversal should be halted. <br><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Traverse the children of each node in a node hierarchy only once.
<p>
The <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> provides a generalized traversal mechanism that avoids redundantly traversing branches of the node hierarchy. If a node occurs multiple places in a branch, <b>the children of that node will be visted in the traversal only once</b>.<p>
For each node encountered in the traversal, node_traverser::performAction is called. Concrete subclasses of <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> implement this method in order to perform some operation on each node.
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="openvrml::node_traverser::node_traverser" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top"> openvrml::node_traverser::node_traverser </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> throw (std::bad_alloc)</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Construct.
<p>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>std::bad_alloc</em> </td><td>if memory allocation fails. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="d0" doxytag="openvrml::node_traverser::node_traverser" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top"> openvrml::node_traverser::node_traverser </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> & </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Not implemented.
<p>
<a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> is not copyable. </td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="d4" doxytag="openvrml::node_traverser::do_traversal" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::do_traversal </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classopenvrml_1_1node.html">node</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Traverse a node.
<p>
<p><b>For internal use only.</b></p>
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>n</em> </td><td>the node to traverse.</td></tr>
</table>
</dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>std::bad_alloc</em> </td><td>if memory allocation fails. </td></tr>
</table>
</dl>
</p>
</td>
</tr>
</table>
<a class="anchor" name="b0" doxytag="openvrml::node_traverser::halt_traversal" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::halt_traversal </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> throw ()<code> [protected]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Halt the traversal.
<p>
If this method is called during a traversal, no more descendent <a class="el" href="classopenvrml_1_1node.html">nodes</a> will be traversed. Note that if halt_traversal is called in the implementation of on_entering, on_leaving will still be called for the current node. </td>
</tr>
</table>
<a class="anchor" name="d2" doxytag="openvrml::node_traverser::on_entering" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::on_entering </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classopenvrml_1_1node.html">node</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private, virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Called for each node in the traversal <em>before</em> traversing the its descendants.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>n</em> </td><td>the node currently being traversed. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="d3" doxytag="openvrml::node_traverser::on_leaving" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::on_leaving </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classopenvrml_1_1node.html">node</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private, virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Called for each node in the traversal <em>after</em> traversing the its descendants.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>n</em> </td><td>the node currently being traversed. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="d1" doxytag="openvrml::node_traverser::operator=" ></a><p>
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<td class="md" nowrap valign="top"> <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> & openvrml::node_traverser::operator= </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> & </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [private]</code></td>
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<td>
</td>
<td>
<p>
Not implemented.
<p>
<a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> is not copyable. </td>
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<a class="anchor" name="a4" doxytag="openvrml::node_traverser::traverse" ></a><p>
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::traverse </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="classopenvrml_1_1node__ptr.html">node_ptr</a> > & </td>
<td class="mdname1" valign="top" nowrap> <em>nodes</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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</td>
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<td>
</td>
<td>
<p>
Traverse an mfnode.
<p>
No guarantee is made about the state of the <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> instance in the event that this method throws.<p>
In addition to std::bad_alloc, this function throws any exception thrown from on_entering or on_leaving.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>nodes</em> </td><td>the root <a class="el" href="classopenvrml_1_1node.html">nodes</a> of the branch to traverse.</td></tr>
</table>
</dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>std::bad_alloc</em> </td><td>if memory allocation fails. </td></tr>
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</dl>
</td>
</tr>
</table>
<a class="anchor" name="a3" doxytag="openvrml::node_traverser::traverse" ></a><p>
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::traverse </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classopenvrml_1_1node__ptr.html">node_ptr</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>node</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Traverse an sfnode.
<p>
No guarantee is made about the state of the <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> instance in the event that this method throws.<p>
In addition to std::bad_alloc, this function throws any exception thrown from onEntering or onLeaving.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>node</em> </td><td>the root node of the branch to traverse.</td></tr>
</table>
</dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>std::bad_alloc</em> </td><td>if memory allocation fails. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a2" doxytag="openvrml::node_traverser::traverse" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top"> void openvrml::node_traverser::traverse </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classopenvrml_1_1node.html">node</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Traverse a node.
<p>
No guarantee is made about the state of the <a class="el" href="classopenvrml_1_1node__traverser.html">node_traverser</a> instance in the event that this method throws.<p>
In addition to std::bad_alloc, this function throws any exception thrown from onEntering or onLeaving.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>n</em> </td><td>the root node of the branch to traverse.</td></tr>
</table>
</dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>std::bad_alloc</em> </td><td>if memory allocation fails. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
</div>
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