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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.adapted.boost_range.filtered"></a><a class="link" href="filtered.html" title="Boost.Range filtered">Boost.Range
filtered</a>
</h5></div></div></div>
<p>
Boost.Range filtered range adaptor is adapted to Boost.Geometry
</p>
<h6>
<a name="geometry.reference.adapted.boost_range.filtered.h0"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_range.filtered.description"></a></span><a class="link" href="filtered.html#geometry.reference.adapted.boost_range.filtered.description">Description</a>
</h6>
<p>
Boost.Range filtered range adaptor filters a range.
</p>
<h6>
<a name="geometry.reference.adapted.boost_range.filtered.h1"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_range.filtered.model_of"></a></span><a class="link" href="filtered.html#geometry.reference.adapted.boost_range.filtered.model_of">Model
of</a>
</h6>
<p>
The Boost.Range filtered range adaptor takes over the model of the original
geometry, which might be:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
a linestring
</li>
<li class="listitem">
a ring
</li>
<li class="listitem">
a multi_point
</li>
<li class="listitem">
a multi_linestring
</li>
<li class="listitem">
a multi_polygon
</li>
</ul></div>
<h6>
<a name="geometry.reference.adapted.boost_range.filtered.h2"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_range.filtered.header"></a></span><a class="link" href="filtered.html#geometry.reference.adapted.boost_range.filtered.header">Header</a>
</h6>
<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">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">boost_range</span><span class="special">/</span><span class="identifier">filtered</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<p>
The standard header <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span></code>
does not include this header.
</p>
<h6>
<a name="geometry.reference.adapted.boost_range.filtered.h3"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_range.filtered.example"></a></span><a class="link" href="filtered.html#geometry.reference.adapted.boost_range.filtered.example">Example</a>
</h6>
<p>
Shows how to use a Boost.Geometry linestring, filtered by Boost.Range
adaptor
</p>
<p>
</p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
<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>
<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">geometries</span><span class="special">/</span><span class="identifier">linestring</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<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">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<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">geometries</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">boost_range</span><span class="special">/</span><span class="identifier">filtered</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">not_two</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">P</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">P</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">p</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">get</span><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">p</span><span class="special">)</span> <span class="special">!=</span> <span class="number">2</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">xy</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">model</span><span class="special">::</span><span class="identifier">linestring</span><span class="special"><</span><span class="identifier">xy</span><span class="special">></span> <span class="identifier">line</span><span class="special">;</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">1</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">2</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">3</span><span class="special">,</span> <span class="number">1</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">0</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">1</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">6</span><span class="special">,</span> <span class="number">2</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">7</span><span class="special">,</span> <span class="number">1</span><span class="special">));</span>
<span class="identifier">line</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">xy</span><span class="special">(</span><span class="number">8</span><span class="special">,</span> <span class="number">0</span><span class="special">));</span>
<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">filtered</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</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">length</span><span class="special">(</span><span class="identifier">line</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</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">length</span><span class="special">(</span><span class="identifier">line</span> <span class="special">|</span> <span class="identifier">filtered</span><span class="special">(</span><span class="identifier">not_two</span><span class="special">()))</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</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">dsv</span><span class="special">(</span><span class="identifier">line</span> <span class="special">|</span> <span class="identifier">filtered</span><span class="special">(</span><span class="identifier">not_two</span><span class="special">()))</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
</p>
<p>
Output:
</p>
<pre class="programlisting">11.3137
9.65685
((0, 0), (1, 1), (3, 1), (4, 0), (5, 1), (7, 1), (8, 0))
</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2009-2013 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam Wulkiewicz<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>)
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