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<a name="geometry.spatial_indexes.rtree_examples.range_adaptors"></a><a class="link" href="range_adaptors.html" title="Range adaptors">Range
adaptors</a>
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<p>
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<pre class="programlisting"><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">point</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">box</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">index</span><span class="special">/</span><span class="identifier">rtree</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="comment">// Boost.Range</span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="comment">// adaptors</span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">adaptor</span><span class="special">/</span><span class="identifier">indexed</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">range</span><span class="special">/</span><span class="identifier">adaptor</span><span class="special">/</span><span class="identifier">transformed</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="comment">// a container</span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
<span class="comment">// just for output</span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
<span class="keyword">namespace</span> <span class="identifier">bg</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="keyword">namespace</span> <span class="identifier">bgi</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">index</span><span class="special">;</span>
<span class="comment">// Define a function object converting a value_type of indexed Range into std::pair<>.</span>
<span class="comment">// This is a generic implementation but of course it'd be possible to use some</span>
<span class="comment">// specific types. One could also take Value as template parameter and access</span>
<span class="comment">// first_type and second_type members, etc.</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">First</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Second</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">pair_maker</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">First</span><span class="special">,</span> <span class="identifier">Second</span><span class="special">></span> <span class="identifier">result_type</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
<span class="keyword">inline</span> <span class="identifier">result_type</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">result_type</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">value</span><span class="special">(),</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">index</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">bg</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">point</span><span class="special"><</span><span class="keyword">float</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">bg</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="identifier">point</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">box</span><span class="special"><</span><span class="identifier">point</span><span class="special">></span> <span class="identifier">box</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">box</span><span class="special">></span> <span class="identifier">container</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">container</span><span class="special">::</span><span class="identifier">size_type</span> <span class="identifier">size_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">box</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">></span> <span class="identifier">value</span><span class="special">;</span>
<span class="comment">// create a container of boxes</span>
<span class="identifier">container</span> <span class="identifier">boxes</span><span class="special">;</span>
<span class="keyword">for</span> <span class="special">(</span> <span class="identifier">size_type</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span> <span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="number">10</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
<span class="special">{</span>
<span class="comment">// add a box into the container</span>
<span class="identifier">box</span> <span class="identifier">b</span><span class="special">(</span><span class="identifier">point</span><span class="special">(</span><span class="identifier">i</span> <span class="special">+</span> <span class="number">0.0f</span><span class="special">,</span> <span class="identifier">i</span> <span class="special">+</span> <span class="number">0.0f</span><span class="special">),</span> <span class="identifier">point</span><span class="special">(</span><span class="identifier">i</span> <span class="special">+</span> <span class="number">0.5f</span><span class="special">,</span> <span class="identifier">i</span> <span class="special">+</span> <span class="number">0.5f</span><span class="special">));</span>
<span class="identifier">boxes</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span>
<span class="special">}</span>
<span class="comment">// create the rtree passing a Range</span>
<span class="identifier">bgi</span><span class="special">::</span><span class="identifier">rtree</span><span class="special"><</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">bgi</span><span class="special">::</span><span class="identifier">quadratic</span><span class="special"><</span><span class="number">16</span><span class="special">></span> <span class="special">></span>
<span class="identifier">rtree</span><span class="special">(</span><span class="identifier">boxes</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">indexed</span><span class="special">()</span>
<span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">adaptors</span><span class="special">::</span><span class="identifier">transformed</span><span class="special">(</span><span class="identifier">pair_maker</span><span class="special"><</span><span class="identifier">box</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">>()));</span>
<span class="comment">// print the number of values using boxes[0] as indexable</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">rtree</span><span class="special">.</span><span class="identifier">count</span><span class="special">(</span><span class="identifier">boxes</span><span class="special">[</span><span class="number">0</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>
<h5>
<a name="geometry.spatial_indexes.rtree_examples.range_adaptors.h0"></a>
<span class="phrase"><a name="geometry.spatial_indexes.rtree_examples.range_adaptors.expected_results"></a></span><a class="link" href="range_adaptors.html#geometry.spatial_indexes.rtree_examples.range_adaptors.expected_results">Expected
results</a>
</h5>
<pre class="programlisting"><span class="number">1</span>
</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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