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<title>buffer</title>
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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.algorithms.buffer.buffer_4"></a><a class="link" href="buffer_4.html" title="buffer">buffer</a>
</h5></div></div></div>
<p>
<a class="indexterm" name="idp107570080"></a>
Calculates the buffer of a geometry.
</p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h0"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.description"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.description">Description</a>
</h6>
<p>
The free function buffer calculates the buffer (a polygon being the spatial
point set collection within a specified maximum distance from a geometry)
of a geometry.
</p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h1"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.synopsis"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.synopsis">Synopsis</a>
</h6>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Input</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Output</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Distance</span><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">buffer</span><span class="special">(</span><span class="identifier">Input</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry_in</span><span class="special">,</span> <span class="identifier">Output</span> <span class="special">&</span> <span class="identifier">geometry_out</span><span class="special">,</span> <span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">distance</span><span class="special">,</span>
<span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">chord_length</span> <span class="special">=</span> <span class="special">-</span><span class="number">1</span><span class="special">)</span></pre>
<p>
</p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h2"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.parameters"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.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>
Input const &
</p>
</td>
<td>
<p>
Any type fulfilling a Geometry Concept
</p>
</td>
<td>
<p>
geometry_in
</p>
</td>
<td>
<p>
A model of the specified concept
</p>
</td>
</tr>
<tr>
<td>
<p>
Output &
</p>
</td>
<td>
<p>
Any type fulfilling a Geometry Concept
</p>
</td>
<td>
<p>
geometry_out
</p>
</td>
<td>
<p>
A model of the specified concept
</p>
</td>
</tr>
<tr>
<td>
<p>
Distance const &
</p>
</td>
<td>
<p>
numerical type (int, double, ttmath, ...)
</p>
</td>
<td>
<p>
distance
</p>
</td>
<td>
<p>
The distance to be used for the buffer
</p>
</td>
</tr>
<tr>
<td>
<p>
Distance const &
</p>
</td>
<td>
<p>
numerical type (int, double, ttmath, ...)
</p>
</td>
<td>
<p>
chord_length
</p>
</td>
<td>
<p>
(optional) The length of the chord's in the generated arcs
around points or bends
</p>
</td>
</tr>
</tbody>
</table></div>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h3"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.header"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.header">Header</a>
</h6>
<p>
Either
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</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">></span></code>
</p>
<p>
Or
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</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">buffer</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h4"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.conformance"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.conformance">Conformance</a>
</h6>
<p>
The function buffer implements function Buffer from the <a href="http://www.opengeospatial.org/standards/sfa" target="_top">OGC
Simple Feature Specification</a>.
</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>
The current implemetation only enlarges a box, which is not defined
by OGC. A next version of the library will contain a more complete
implementation
</p></td></tr>
</table></div>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h5"></a>
<span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.behavior"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.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>
Box/Box
</p>
</td>
<td>
<p>
Returns a new rectangular box, enlarged with the specified
distance. It is allowed that "geometry_out" the same
object as "geometry_in"
</p>
</td>
</tr></tbody>
</table></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2009-2015 Barend Gehrels, Bruno Lalande,
Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its affiliates<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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