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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="geometry.reference.adapted.boost_fusion"></a><a class="link" href="boost_fusion.html" title="Boost.Fusion">Boost.Fusion</a>
</h4></div></div></div>
<p>
Boost.Fusion adapted structs or classes are adapted to the Boost.Geometry
point concept
</p>
<h6>
<a name="geometry.reference.adapted.boost_fusion.h0"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_fusion.description"></a></span><a class="link" href="boost_fusion.html#geometry.reference.adapted.boost_fusion.description">Description</a>
</h6>
<p>
Boost.Fusion adapted structs are (optionally) adapted to the Boost.Geometry
point concept. They can therefore be used in many Boost.Geometry algorithms.
</p>
<h6>
<a name="geometry.reference.adapted.boost_fusion.h1"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_fusion.model_of"></a></span><a class="link" href="boost_fusion.html#geometry.reference.adapted.boost_fusion.model_of">Model
of</a>
</h6>
<p>
<a class="link" href="../concepts/concept_point.html" title="Point Concept">Point Concept</a>
</p>
<h6>
<a name="geometry.reference.adapted.boost_fusion.h2"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_fusion.header"></a></span><a class="link" href="boost_fusion.html#geometry.reference.adapted.boost_fusion.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_fusion</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_fusion.h3"></a>
<span class="phrase"><a name="geometry.reference.adapted.boost_fusion.example"></a></span><a class="link" href="boost_fusion.html#geometry.reference.adapted.boost_fusion.example">Example</a>
</h6>
<p>
Shows how to combine Boost.Fusion with Boost.Geometry
</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">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">adapt_struct_named</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">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_fusion</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">sample_point</span>
<span class="special">{</span>
<span class="keyword">double</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">y</span><span class="special">,</span> <span class="identifier">z</span><span class="special">;</span>
<span class="special">};</span>
<span class="identifier">BOOST_FUSION_ADAPT_STRUCT</span><span class="special">(</span><span class="identifier">sample_point</span><span class="special">,</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">y</span><span class="special">)</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">z</span><span class="special">))</span>
<span class="identifier">BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS</span><span class="special">(</span><span class="identifier">cs</span><span class="special">::</span><span class="identifier">cartesian</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="identifier">sample_point</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">,</span> <span class="identifier">c</span><span class="special">;</span>
<span class="comment">// Set coordinates the Boost.Geometry way (one of the ways)</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">assign_values</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
<span class="comment">// Set coordinates the Boost.Fusion way</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">at_c</span><span class="special"><</span><span class="number">0</span><span class="special">>(</span><span class="identifier">b</span><span class="special">)</span> <span class="special">=</span> <span class="number">6</span><span class="special">;</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">at_c</span><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">b</span><span class="special">)</span> <span class="special">=</span> <span class="number">5</span><span class="special">;</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">at_c</span><span class="special"><</span><span class="number">2</span><span class="special">>(</span><span class="identifier">b</span><span class="special">)</span> <span class="special">=</span> <span class="number">4</span><span class="special">;</span>
<span class="comment">// Set coordinates the native way</span>
<span class="identifier">c</span><span class="special">.</span><span class="identifier">x</span> <span class="special">=</span> <span class="number">9</span><span class="special">;</span>
<span class="identifier">c</span><span class="special">.</span><span class="identifier">y</span> <span class="special">=</span> <span class="number">8</span><span class="special">;</span>
<span class="identifier">c</span><span class="special">.</span><span class="identifier">z</span> <span class="special">=</span> <span class="number">7</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="string">"Distance a-b: "</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">distance</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</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">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Distance a-c: "</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">distance</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">c</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">Distance a-b: 5.19615
Distance a-c: 10.3923
</pre>
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