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<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.algorithms.for_each.for_each_point_2"></a><a class="link" href="for_each_point_2.html" title="for_each_point">for_each_point</a>
</h5></div></div></div>
<p>
<a class="indexterm" name="id866732"></a>
Applies function <span class="bold"><strong>f</strong></span> to each point.
</p>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.description"></a><h6>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.description-heading"></a>
<a class="link" href="for_each_point_2.html#geometry.reference.algorithms.for_each.for_each_point_2.description">Description</a>
</h6>
<p>
Applies a function <span class="bold"><strong>f</strong></span> (functor, having
operator() defined) to each point making up the geometry
</p>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.synopsis"></a><h6>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.synopsis-heading"></a>
<a class="link" href="for_each_point_2.html#geometry.reference.algorithms.for_each.for_each_point_2.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">Functor</span><span class="special">&gt;</span>
<span class="identifier">Functor</span> <span class="identifier">for_each_point</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="special">&amp;</span> <span class="identifier">geometry</span><span class="special">,</span> <span class="identifier">Functor</span> <span class="identifier">f</span><span class="special">)</span></pre>
<p>
</p>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.parameters"></a><h6>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.parameters-heading"></a>
<a class="link" href="for_each_point_2.html#geometry.reference.algorithms.for_each.for_each_point_2.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 &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>
Functor
</p>
</td>
<td>
<p>
Function or class with operator()
</p>
</td>
<td>
<p>
f
</p>
</td>
<td>
<p>
Unary function, taking a point as argument
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.header"></a><h6>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.header-heading"></a>
<a class="link" href="for_each_point_2.html#geometry.reference.algorithms.for_each.for_each_point_2.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">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">for_each</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.example"></a><h6>
<a name="geometry.reference.algorithms.for_each.for_each_point_2.example-heading"></a>
<a class="link" href="for_each_point_2.html#geometry.reference.algorithms.for_each.for_each_point_2.example">Example</a>
</h6>
<p>
Convenient usage of for_each_point, rounding all points of a geometry
</p>
<p>
</p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<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>
<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">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<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">geometries</span><span class="special">/</span><span class="identifier">polygon</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<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">domains</span><span class="special">/</span><span class="identifier">gis</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Point</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">round_coordinates</span>
<span class="special">{</span>
<span class="keyword">private</span> <span class="special">:</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">coordinate_type</span><span class="special">&lt;</span><span class="identifier">Point</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">coordinate_type</span><span class="special">;</span>
<span class="identifier">coordinate_type</span> <span class="identifier">factor</span><span class="special">;</span>
<span class="keyword">inline</span> <span class="identifier">coordinate_type</span> <span class="identifier">round</span><span class="special">(</span><span class="identifier">coordinate_type</span> <span class="identifier">value</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">floor</span><span class="special">(</span><span class="number">0.5</span> <span class="special">+</span> <span class="special">(</span><span class="identifier">value</span> <span class="special">/</span> <span class="identifier">factor</span><span class="special">))</span> <span class="special">*</span> <span class="identifier">factor</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">public</span> <span class="special">:</span>
<span class="identifier">round_coordinates</span><span class="special">(</span><span class="identifier">coordinate_type</span> <span class="identifier">f</span><span class="special">)</span>
<span class="special">:</span> <span class="identifier">factor</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span>
<span class="special">{}</span>
<span class="keyword">inline</span> <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Point</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">using</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="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">set</span><span class="special">;</span>
<span class="identifier">set</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">p</span><span class="special">,</span> <span class="identifier">round</span><span class="special">(</span><span class="identifier">get</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">p</span><span class="special">)));</span>
<span class="identifier">set</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">p</span><span class="special">,</span> <span class="identifier">round</span><span class="special">(</span><span class="identifier">get</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">p</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">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">point</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">polygon</span><span class="special">&lt;</span><span class="identifier">point</span><span class="special">&gt;</span> <span class="identifier">poly</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">read_wkt</span><span class="special">(</span><span class="string">"POLYGON((0 0,1.123 9.987,8.876 2.234,0 0),(3.345 4.456,7.654 8.765,9.123 5.432,3.345 4.456))"</span><span class="special">,</span> <span class="identifier">poly</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">for_each_point</span><span class="special">(</span><span class="identifier">poly</span><span class="special">,</span> <span class="identifier">round_coordinates</span><span class="special">&lt;</span><span class="identifier">point</span><span class="special">&gt;(</span><span class="number">0.1</span><span class="special">));</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Rounded: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">wkt</span><span class="special">(</span><span class="identifier">poly</span><span class="special">)</span> <span class="special">&lt;&lt;</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">Rounded: POLYGON((0 0,1.1 10,8.9 2.2,0 0),(3.3 4.5,7.7 8.8,9.1 5.4,3.3 4.5))
</pre>
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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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