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<title>perimeter (with strategy)</title>
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<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy"></a><a class="link" href="perimeter_2_with_strategy.html" title="perimeter (with strategy)">perimeter
(with strategy)</a>
</h5></div></div></div>
<p>
<a class="indexterm" name="idp117522704"></a>
Calculates the perimeter of a geometry using the specified strategy.
</p>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h0"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.description"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.description">Description</a>
</h6>
<p>
The function perimeter returns the perimeter of a geometry, using specified
strategy
</p>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h1"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.synopsis"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.synopsis">Synopsis</a>
</h6>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Strategy</span><span class="special">&gt;</span>
<span class="identifier">default_length_result</span><span class="special">&lt;</span><span class="identifier">Geometry</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">perimeter</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">geometry</span><span class="special">,</span> <span class="identifier">Strategy</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">strategy</span><span class="special">)</span></pre>
<p>
</p>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h2"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.parameters"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Type
</p>
</th>
<th>
<p>
Concept
</p>
</th>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
Geometry const &amp;
</p>
</td>
<td>
<p>
Any type fulfilling a Geometry Concept
</p>
</td>
<td>
<p>
geometry
</p>
</td>
<td>
<p>
A model of the specified concept
</p>
</td>
</tr>
<tr>
<td>
<p>
Strategy const &amp;
</p>
</td>
<td>
<p>
Any type fulfilling a distance Strategy Concept
</p>
</td>
<td>
<p>
strategy
</p>
</td>
<td>
<p>
strategy to be used for distance calculations.
</p>
</td>
</tr>
</tbody>
</table></div>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h3"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.returns"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.returns">Returns</a>
</h6>
<p>
The calculated perimeter
</p>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h4"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.header"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.header">Header</a>
</h6>
<p>
Either
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<p>
Or
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">algorithms</span><span class="special">/</span><span class="identifier">perimeter</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h5"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.conformance"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.conformance">Conformance</a>
</h6>
<p>
The function perimeter is not defined by OGC.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
PostGIS contains an algorithm with the same name and the same functionality.
See the <a href="http://www.postgis.org/docs/ST_Perimeter.html" target="_top">PostGIS
documentation</a>.
</p></td></tr>
</table></div>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h6"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.behavior"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.behavior">Behavior</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Case
</p>
</th>
<th>
<p>
Behavior
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
pointlike (e.g. point)
</p>
</td>
<td>
<p>
Returns zero
</p>
</td>
</tr>
<tr>
<td>
<p>
linear (e.g. linestring)
</p>
</td>
<td>
<p>
Returns zero
</p>
</td>
</tr>
<tr>
<td>
<p>
areal (e.g. polygon)
</p>
</td>
<td>
<p>
Returns the perimeter
</p>
</td>
</tr>
</tbody>
</table></div>
<h6>
<a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.h7"></a>
<span class="phrase"><a name="geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.complexity"></a></span><a class="link" href="perimeter_2_with_strategy.html#geometry.reference.algorithms.perimeter.perimeter_2_with_strategy.complexity">Complexity</a>
</h6>
<p>
Linear
</p>
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