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  24 </div>
  25 <div class="section">
  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="geometry.spatial_indexes.rtree_examples.range_adaptors"></a><a class="link" href="range_adaptors.html" title="Range adaptors">Range
  28         adaptors</a>
  29 </h4></div></div></div>
  30 <p>
  31 </p>
  32 <pre class="programlisting"><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>
  33 <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</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  34 <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">box</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  35
  36 <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">index</span><span class="special">/</span><span class="identifier">rtree</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  37
  38 <span class="comment">// Boost.Range</span>
  39 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
  40 <span class="comment">// adaptors</span>
  41 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
  42 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
  43
  44 <span class="comment">// a container</span>
  45 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">vector</span><span class="special">&gt;</span>
  46
  47 <span class="comment">// just for output</span>
  48 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  49
  50 <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>
  51 <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>
  52
  53 <span class="comment">// Define a function object converting a value_type of indexed Range into std::pair&lt;&gt;.</span>
  54 <span class="comment">// This is a generic implementation but of course it'd be possible to use some</span>
  55 <span class="comment">// specific types. One could also take Value as template parameter and access</span>
  56 <span class="comment">// first_type and second_type members, etc.</span>
  57 <span class="keyword">template</span> <span class="special">&lt;</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">&gt;</span>
  58 <span class="keyword">struct</span> <span class="identifier">pair_maker</span>
  59 <span class="special">{</span>
  60     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">First</span><span class="special">,</span> <span class="identifier">Second</span><span class="special">&gt;</span> <span class="identifier">result_type</span><span class="special">;</span>
  61     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
  62     <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">&amp;</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span>
  63     <span class="special">{</span>
  64         <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>
  65     <span class="special">}</span>
  66 <span class="special">};</span>
  67
  68 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
  69 <span class="special">{</span>
  70     <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">&lt;</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">&gt;</span> <span class="identifier">point</span><span class="special">;</span>
  71     <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">&lt;</span><span class="identifier">point</span><span class="special">&gt;</span> <span class="identifier">box</span><span class="special">;</span>
  72
  73     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">&gt;</span> <span class="identifier">container</span><span class="special">;</span>
  74     <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>
  75
  76     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">&gt;</span> <span class="identifier">value</span><span class="special">;</span>
  77
  78     <span class="comment">// create a container of boxes</span>
  79     <span class="identifier">container</span> <span class="identifier">boxes</span><span class="special">;</span>
  80     <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">&lt;</span> <span class="number">10</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
  81     <span class="special">{</span>
  82         <span class="comment">// add a box into the container</span>
  83         <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>
  84         <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>
  85     <span class="special">}</span>
  86
  87     <span class="comment">// create the rtree passing a Range</span>
  88     <span class="identifier">bgi</span><span class="special">::</span><span class="identifier">rtree</span><span class="special">&lt;</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">&lt;</span><span class="number">16</span><span class="special">&gt;</span> <span class="special">&gt;</span>
  89         <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>
  90                     <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">&lt;</span><span class="identifier">box</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">&gt;()));</span>
  91
  92     <span class="comment">// print the number of values using boxes[0] as indexable</span>
  93     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</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">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  94
  95     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
  96 <span class="special">}</span>
  97 </pre>
  98 <p>
  99         </p>
 100 <h5>
 101 <a name="geometry.spatial_indexes.rtree_examples.range_adaptors.h0"></a>
 102           <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
 103           results</a>
 104         </h5>
 105 <pre class="programlisting"><span class="number">1</span>
 106 </pre>
 107 </div>
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 111       Gehrels, Bruno Lalande, Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its
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 113         Distributed under the Boost Software License, Version 1.0. (See accompanying
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