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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>
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