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  25 <div class="section">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model"></a><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html" title="Example source code: Adapting a legacy geometry object model">Example
  28       source code: Adapting a legacy geometry object model</a>
  29 </h3></div></div></div>
  30 <h3>
  31 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h0"></a>
  32         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qpoint"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qpoint">Adaption
  33         of QPoint</a>
  34       </h3>
  35 <a name="adaption_of_qpoint_source_code"></a><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>
  36
  37 <span class="keyword">namespace</span> <span class="identifier">boost</span>
  38 <span class="special">{</span>
  39     <span class="keyword">namespace</span> <span class="identifier">geometry</span>
  40     <span class="special">{</span>
  41         <span class="keyword">namespace</span> <span class="identifier">traits</span>
  42         <span class="special">{</span>
  43             <span class="comment">// Adapt QPoint to Boost.Geometry</span>
  44
  45             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">tag</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">&gt;</span>
  46             <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">point_tag</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
  47
  48             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">coordinate_type</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">&gt;</span>
  49             <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">double</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
  50
  51             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">coordinate_system</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">&gt;</span>
  52             <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">cs</span><span class="special">::</span><span class="identifier">cartesian</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
  53
  54             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">dimension</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">&gt;</span> <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">2</span><span class="special">&gt;</span> <span class="special">{};</span>
  55
  56             <span class="keyword">template</span><span class="special">&lt;&gt;</span>
  57             <span class="keyword">struct</span> <span class="identifier">access</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">,</span> <span class="number">0</span><span class="special">&gt;</span>
  58             <span class="special">{</span>
  59                 <span class="keyword">static</span> <span class="identifier">QPoint</span><span class="special">::</span><span class="keyword">double</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPoint</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
  60                 <span class="special">{</span>
  61                     <span class="keyword">return</span> <span class="identifier">p</span><span class="special">.</span><span class="identifier">x</span><span class="special">;</span>
  62                 <span class="special">}</span>
  63
  64                 <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set</span><span class="special">(</span><span class="identifier">QPoint</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">QPoint</span><span class="special">::</span><span class="keyword">double</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">value</span><span class="special">)</span>
  65                 <span class="special">{</span>
  66                     <span class="identifier">p</span><span class="special">.</span><span class="identifier">x</span> <span class="special">=</span> <span class="identifier">value</span><span class="special">;</span>
  67                 <span class="special">}</span>
  68             <span class="special">};</span>
  69
  70             <span class="keyword">template</span><span class="special">&lt;&gt;</span>
  71             <span class="keyword">struct</span> <span class="identifier">access</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span>
  72             <span class="special">{</span>
  73                 <span class="keyword">static</span> <span class="identifier">QPoint</span><span class="special">::</span><span class="keyword">double</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPoint</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
  74                 <span class="special">{</span>
  75                     <span class="keyword">return</span> <span class="identifier">p</span><span class="special">.</span><span class="identifier">y</span><span class="special">;</span>
  76                 <span class="special">}</span>
  77
  78                 <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set</span><span class="special">(</span><span class="identifier">QPoint</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">QPoint</span><span class="special">::</span><span class="keyword">double</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">value</span><span class="special">)</span>
  79                 <span class="special">{</span>
  80                     <span class="identifier">p</span><span class="special">.</span><span class="identifier">y</span> <span class="special">=</span> <span class="identifier">value</span><span class="special">;</span>
  81                 <span class="special">}</span>
  82             <span class="special">};</span>
  83         <span class="special">}</span>
  84     <span class="special">}</span>
  85 <span class="special">}</span> <span class="comment">// namespace boost::geometry::traits</span>
  86 </pre>
  87 <h3>
  88 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h1"></a>
  89         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qlinestring"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qlinestring">Adaption
  90         of QLineString</a>
  91       </h3>
  92 <a name="adaption_of_qlinestring_source_code"></a><pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
  93 <span class="special">{</span>
  94     <span class="keyword">namespace</span> <span class="identifier">geometry</span>
  95     <span class="special">{</span>
  96         <span class="keyword">namespace</span> <span class="identifier">traits</span>
  97         <span class="special">{</span>
  98             <span class="keyword">template</span><span class="special">&lt;&gt;</span>
  99             <span class="keyword">struct</span> <span class="identifier">tag</span><span class="special">&lt;</span><span class="identifier">QLineString</span><span class="special">&gt;</span>
 100             <span class="special">{</span>
 101                 <span class="keyword">typedef</span> <span class="identifier">linestring_tag</span> <span class="identifier">type</span><span class="special">;</span>
 102             <span class="special">};</span>
 103         <span class="special">}</span>
 104     <span class="special">}</span>
 105 <span class="special">}</span> <span class="comment">// namespace boost::geometry::traits</span>
 106 </pre>
 107 <h4>
 108 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h2"></a>
 109         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_qlinestring"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_qlinestring">Boost.Range
 110         for QLineString</a>
 111       </h4>
 112 <a name="adaption_of_qlinestring_range_source_code"></a><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">range</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 113
 114 <span class="keyword">namespace</span> <span class="identifier">boost</span>
 115 <span class="special">{</span>
 116     <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
 117     <span class="keyword">struct</span> <span class="identifier">range_iterator</span><span class="special">&lt;</span><span class="identifier">QLineString</span><span class="special">&gt;</span>
 118     <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">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">iterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 119
 120     <span class="keyword">template</span><span class="special">&lt;&gt;</span>
 121     <span class="keyword">struct</span> <span class="identifier">range_const_iterator</span><span class="special">&lt;</span><span class="identifier">QLineString</span><span class="special">&gt;</span>
 122     <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">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 123 <span class="special">}</span>
 124
 125 <span class="keyword">inline</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">iterator</span>
 126 <span class="identifier">range_begin</span><span class="special">(</span><span class="identifier">QLineString</span><span class="special">&amp;</span> <span class="identifier">qls</span><span class="special">)</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">qls</span><span class="special">.</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();}</span>
 127
 128 <span class="keyword">inline</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">iterator</span>
 129 <span class="identifier">range_end</span><span class="special">(</span><span class="identifier">QLineString</span><span class="special">&amp;</span> <span class="identifier">qls</span><span class="special">)</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">qls</span><span class="special">.</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">end</span><span class="special">();}</span>
 130
 131 <span class="keyword">inline</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span>
 132 <span class="identifier">range_begin</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">QLineString</span><span class="special">&amp;</span> <span class="identifier">qls</span><span class="special">)</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">qls</span><span class="special">.</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();}</span>
 133
 134 <span class="keyword">inline</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QPoint</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span>
 135 <span class="identifier">range_end</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">QLineString</span><span class="special">&amp;</span> <span class="identifier">qls</span><span class="special">)</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">qls</span><span class="special">.</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">end</span><span class="special">();}</span>
 136 </pre>
 137 <h3>
 138 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h3"></a>
 139         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qring"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qring">Adaption
 140         of QRing</a>
 141       </h3>
 142 <a name="adaption_of_qring_source_code"></a><pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
 143 <span class="special">{</span>
 144     <span class="keyword">namespace</span> <span class="identifier">geometry</span>
 145     <span class="special">{</span>
 146         <span class="keyword">namespace</span> <span class="identifier">traits</span>
 147         <span class="special">{</span>
 148             <span class="keyword">template</span><span class="special">&lt;&gt;</span>
 149             <span class="keyword">struct</span> <span class="identifier">tag</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">&gt;</span>
 150             <span class="special">{</span>
 151                 <span class="keyword">typedef</span> <span class="identifier">ring_tag</span> <span class="identifier">type</span><span class="special">;</span>
 152             <span class="special">};</span>
 153         <span class="special">}</span>
 154     <span class="special">}</span>
 155 <span class="special">}</span> <span class="comment">// namespace boost::geometry::traits</span>
 156 </pre>
 157 <h4>
 158 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h4"></a>
 159         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_iterator_for_qring"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_iterator_for_qring">Boost.Iterator
 160         for QRing</a>
 161       </h4>
 162 <a name="adaption_of_qring_iterator_source_code"></a><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">iterator</span><span class="special">/</span><span class="identifier">iterator_facade</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 163
 164 <span class="comment">/* Custom iterator type that flattens a 2D array into a 1D array */</span>
 165 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">I</span><span class="special">,</span> <span class="comment">// Line iterator type</span>
 166           <span class="keyword">class</span> <span class="identifier">R</span>  <span class="comment">// Point reference type</span>
 167          <span class="special">&gt;</span>
 168 <span class="keyword">class</span> <span class="identifier">RingIteratorImpl</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_facade</span><span class="special">&lt;</span>
 169         <span class="identifier">RingIteratorImpl</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">R</span><span class="special">&gt;,</span> <span class="identifier">R</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">random_access_iterator_tag</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&gt;</span> <span class="comment">//new traversal tag boost::random_access_traversal_tag</span>
 170 <span class="special">{</span>
 171 <span class="keyword">public</span><span class="special">:</span>
 172     <span class="identifier">RingIteratorImpl</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">pointIndex_</span><span class="special">(</span><span class="number">0</span><span class="special">)</span>
 173     <span class="special">{</span>
 174     <span class="special">}</span>
 175
 176     <span class="keyword">explicit</span> <span class="identifier">RingIteratorImpl</span><span class="special">(</span><span class="identifier">I</span> <span class="identifier">lineStringIterCurrent</span><span class="special">)</span>
 177     <span class="special">:</span>   <span class="identifier">lineStringIterCurrent_</span><span class="special">(</span><span class="identifier">lineStringIterCurrent</span><span class="special">),</span> <span class="identifier">pointIndex_</span><span class="special">(</span><span class="number">0</span><span class="special">)</span>
 178     <span class="special">{</span>
 179     <span class="special">}</span>
 180
 181     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OtherI</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OtherR</span><span class="special">&gt;</span>
 182     <span class="identifier">RingIteratorImpl</span><span class="special">(</span><span class="identifier">RingIteratorImpl</span><span class="special">&lt;</span><span class="identifier">OtherI</span><span class="special">,</span> <span class="identifier">OtherR</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">:</span>
 183         <span class="identifier">lineStringIterCurrent_</span><span class="special">(</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">getLineStrIt</span><span class="special">()),</span> <span class="identifier">pointIndex_</span><span class="special">(</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">getPointIdx</span><span class="special">())</span>
 184     <span class="special">{</span>
 185     <span class="special">}</span>
 186
 187     <span class="identifier">I</span> <span class="identifier">getLineStrIt</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">lineStringIterCurrent_</span><span class="special">;}</span>
 188
 189     <span class="keyword">bool</span> <span class="identifier">isEmpty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">isEmpty</span><span class="special">;}</span>
 190     <span class="identifier">size_t</span> <span class="identifier">getPointIdx</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">pointIndex_</span><span class="special">;}</span>
 191
 192     <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_facade</span><span class="special">&lt;</span><span class="identifier">RingIteratorImpl</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">R</span><span class="special">&gt;,</span> <span class="identifier">R</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">random_access_iterator_tag</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&gt;::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span>
 193
 194 <span class="keyword">private</span><span class="special">:</span>
 195     <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_core_access</span><span class="special">;</span>
 196
 197     <span class="keyword">void</span> <span class="identifier">increment</span><span class="special">()</span>
 198     <span class="special">{</span>
 199         <span class="special">++</span><span class="identifier">pointIndex_</span><span class="special">;</span>
 200         <span class="keyword">if</span> <span class="special">(</span><span class="identifier">pointIndex_</span> <span class="special">&gt;=</span> <span class="special">(*</span><span class="identifier">lineStringIterCurrent_</span><span class="special">)-&gt;</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">size</span><span class="special">())</span>
 201         <span class="special">{</span>
 202             <span class="special">++</span><span class="identifier">lineStringIterCurrent_</span><span class="special">;</span>
 203             <span class="identifier">pointIndex_</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
 204         <span class="special">}</span>
 205     <span class="special">}</span>
 206
 207     <span class="keyword">void</span> <span class="identifier">decrement</span><span class="special">()</span>
 208     <span class="special">{</span>
 209         <span class="keyword">if</span><span class="special">(</span><span class="identifier">pointIndex_</span><span class="special">&gt;</span><span class="number">0</span><span class="special">)</span>
 210         <span class="special">{</span>
 211             <span class="special">--</span><span class="identifier">pointIndex_</span><span class="special">;</span>
 212         <span class="special">}</span>
 213         <span class="keyword">else</span>
 214         <span class="special">{</span>
 215             <span class="special">--</span><span class="identifier">lineStringIterCurrent_</span><span class="special">;</span>
 216             <span class="identifier">pointIndex_</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">lineStringIterCurrent_</span><span class="special">)-&gt;</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span>
 217         <span class="special">}</span>
 218     <span class="special">}</span>
 219
 220     <span class="keyword">void</span> <span class="identifier">advance</span><span class="special">(</span><span class="identifier">difference_type</span> <span class="identifier">n</span><span class="special">)</span>
 221     <span class="special">{</span>
 222         <span class="identifier">difference_type</span> <span class="identifier">counter</span> <span class="special">=</span> <span class="identifier">n</span><span class="special">;</span>
 223
 224         <span class="identifier">difference_type</span> <span class="identifier">maxPointIndex</span><span class="special">,</span> <span class="identifier">remainderPointIndex</span><span class="special">;</span>
 225
 226         <span class="keyword">while</span><span class="special">(</span><span class="identifier">counter</span><span class="special">&gt;</span><span class="number">0</span><span class="special">)</span>
 227         <span class="special">{</span>
 228             <span class="identifier">maxPointIndex</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">lineStringIterCurrent_</span><span class="special">)-&gt;</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">size</span><span class="special">(),</span>
 229             <span class="identifier">remainderPointIndex</span> <span class="special">=</span> <span class="identifier">maxPointIndex</span> <span class="special">-</span> <span class="identifier">pointIndex_</span><span class="special">;</span>
 230
 231             <span class="keyword">if</span><span class="special">(</span><span class="identifier">counter</span><span class="special">&gt;</span><span class="identifier">remainderPointIndex</span><span class="special">)</span>
 232             <span class="special">{</span>
 233                 <span class="identifier">counter</span> <span class="special">-=</span> <span class="identifier">remainderPointIndex</span><span class="special">;</span>
 234                 <span class="special">++</span><span class="identifier">lineStringIterCurrent_</span><span class="special">;</span>
 235             <span class="special">}</span>
 236             <span class="keyword">else</span> <span class="comment">// (counter&lt;=remainderPointIndex)</span>
 237             <span class="special">{</span>
 238                 <span class="identifier">counter</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
 239                 <span class="identifier">pointIndex_</span> <span class="special">=</span> <span class="identifier">remainderPointIndex</span><span class="special">;</span>
 240             <span class="special">}</span>
 241         <span class="special">}</span>
 242
 243     <span class="special">}</span>
 244
 245     <span class="identifier">difference_type</span> <span class="identifier">distance_to</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RingIteratorImpl</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span>
 246     <span class="special">{</span>
 247         <span class="identifier">I</span> <span class="identifier">currentLineStringIter</span> <span class="special">=</span> <span class="identifier">getLineStrIt</span><span class="special">();</span>
 248         <span class="identifier">I</span> <span class="identifier">otherLineStringIter</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getLineStrIt</span><span class="special">();</span>
 249
 250         <span class="identifier">difference_type</span> <span class="identifier">count</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
 251         <span class="identifier">difference_type</span> <span class="identifier">distance_to_other</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">currentLineStringIter</span><span class="special">,</span> <span class="identifier">otherLineStringIter</span><span class="special">);</span>
 252
 253         <span class="keyword">if</span><span class="special">(</span><span class="identifier">distance_to_other</span> <span class="special">&lt;</span> <span class="number">0</span><span class="special">)</span>
 254         <span class="special">{</span>
 255             <span class="identifier">count</span> <span class="special">+=</span> <span class="identifier">pointIndex_</span><span class="special">;</span>
 256
 257             <span class="keyword">while</span><span class="special">(</span><span class="identifier">distance_to_other</span> <span class="special">&lt;</span> <span class="number">0</span><span class="special">)</span>
 258             <span class="special">{</span>
 259             <span class="identifier">QLineString</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">ls</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">otherLineStringIter</span><span class="special">;</span>
 260             <span class="identifier">count</span> <span class="special">-=</span> <span class="identifier">ls</span><span class="special">-&gt;</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span>
 261
 262             <span class="special">++</span><span class="identifier">otherLineStringIter</span><span class="special">;</span>
 263             <span class="special">++</span><span class="identifier">distance_to_other</span><span class="special">;</span>
 264             <span class="special">}</span>
 265
 266             <span class="identifier">assert</span><span class="special">(</span><span class="identifier">otherLineStringIter</span><span class="special">==</span><span class="identifier">currentLineStringIter</span><span class="special">);</span>
 267         <span class="special">}</span>
 268         <span class="keyword">else</span> <span class="keyword">if</span><span class="special">(</span><span class="identifier">distance_to_other</span> <span class="special">&gt;</span> <span class="number">0</span><span class="special">)</span>
 269         <span class="special">{</span>
 270             <span class="identifier">count</span> <span class="special">-=</span> <span class="identifier">pointIndex_</span><span class="special">;</span>
 271
 272             <span class="keyword">while</span><span class="special">(</span><span class="identifier">distance_to_other</span> <span class="special">&lt;</span> <span class="number">0</span><span class="special">)</span>
 273             <span class="special">{</span>
 274             <span class="identifier">QLineString</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">ls</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">currentLineStringIter</span><span class="special">;</span>
 275             <span class="identifier">count</span> <span class="special">+=</span> <span class="identifier">ls</span><span class="special">-&gt;</span><span class="identifier">points</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span>
 276
 277             <span class="special">++</span><span class="identifier">currentLineStringIter</span><span class="special">;</span>
 278             <span class="special">--</span><span class="identifier">distance_to_other</span><span class="special">;</span>
 279             <span class="special">}</span>
 280
 281             <span class="identifier">assert</span><span class="special">(</span><span class="identifier">otherLineStringIter</span><span class="special">==</span><span class="identifier">currentLineStringIter</span><span class="special">);</span>
 282         <span class="special">}</span>
 283         <span class="keyword">else</span>
 284         <span class="special">{</span>
 285             <span class="identifier">count</span> <span class="special">=</span> <span class="identifier">pointIndex_</span> <span class="special">-</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getPointIdx</span><span class="special">();</span>
 286         <span class="special">}</span>
 287
 288         <span class="keyword">return</span> <span class="identifier">count</span><span class="special">;</span>
 289     <span class="special">}</span>
 290
 291     <span class="keyword">bool</span> <span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RingIteratorImpl</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span>
 292     <span class="special">{</span>
 293         <span class="keyword">return</span> <span class="special">(</span><span class="identifier">lineStringIterCurrent_</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getLineStrIt</span><span class="special">())</span> <span class="special">&amp;&amp;</span>
 294                <span class="special">(</span><span class="identifier">pointIndex_</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getPointIdx</span><span class="special">());</span>
 295     <span class="special">}</span>
 296
 297     <span class="identifier">R</span> <span class="identifier">dereference</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="special">*(*</span><span class="identifier">lineStringIterCurrent_</span><span class="special">)-&gt;</span><span class="identifier">points</span><span class="special">[</span><span class="identifier">pointIndex_</span><span class="special">];}</span>
 298
 299
 300     <span class="identifier">I</span> <span class="identifier">lineStringIterCurrent_</span><span class="special">;</span>
 301
 302     <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">;</span>
 303     <span class="identifier">size_t</span> <span class="identifier">pointIndex_</span><span class="special">;</span>
 304 <span class="special">};</span>
 305 </pre>
 306 <h4>
 307 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h5"></a>
 308         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_qring"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_qring">Boost.Range
 309         for QRing</a>
 310       </h4>
 311 <a name="adaption_of_qring_range_source_code"></a><pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">RingIteratorImpl</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QLineString</span><span class="special">*&gt;::</span><span class="identifier">iterator</span><span class="special">,</span> <span class="identifier">QPoint</span><span class="special">&gt;</span> <span class="identifier">RingIterator</span><span class="special">;</span>
 312 <span class="keyword">typedef</span> <span class="identifier">RingIteratorImpl</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QLineString</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">QPoint</span><span class="special">&gt;</span> <span class="identifier">ConstRingIterator</span><span class="special">;</span>
 313
 314 <span class="keyword">namespace</span> <span class="identifier">boost</span>
 315 <span class="special">{</span>
 316     <span class="comment">// Specialize metafunctions. We must include the range.hpp header.</span>
 317     <span class="comment">// We must open the 'boost' namespace.</span>
 318
 319     <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
 320     <span class="keyword">struct</span> <span class="identifier">range_iterator</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">&gt;</span>
 321     <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">RingIterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 322
 323     <span class="keyword">template</span><span class="special">&lt;&gt;</span>
 324     <span class="keyword">struct</span> <span class="identifier">range_const_iterator</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">&gt;</span>
 325     <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">ConstRingIterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 326
 327 <span class="special">}</span> <span class="comment">// namespace 'boost'</span>
 328
 329
 330 <span class="comment">// The required Range functions. These should be defined in the same namespace</span>
 331 <span class="comment">// as Ring.</span>
 332
 333 <span class="keyword">inline</span> <span class="identifier">RingIterator</span> <span class="identifier">range_begin</span><span class="special">(</span><span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 334 <span class="special">{</span><span class="keyword">return</span> <span class="identifier">RingIterator</span><span class="special">(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">lines</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());}</span>
 335
 336 <span class="keyword">inline</span> <span class="identifier">ConstRingIterator</span> <span class="identifier">range_begin</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 337 <span class="special">{</span><span class="keyword">return</span> <span class="identifier">ConstRingIterator</span><span class="special">(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">lines</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());}</span>
 338
 339 <span class="keyword">inline</span> <span class="identifier">RingIterator</span> <span class="identifier">range_end</span><span class="special">(</span><span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 340 <span class="special">{</span><span class="keyword">return</span> <span class="identifier">RingIterator</span><span class="special">(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">lines</span><span class="special">.</span><span class="identifier">end</span><span class="special">());}</span>
 341
 342 <span class="keyword">inline</span> <span class="identifier">ConstRingIterator</span> <span class="identifier">range_end</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 343 <span class="special">{</span><span class="keyword">return</span> <span class="identifier">ConstRingIterator</span><span class="special">(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">lines</span><span class="special">.</span><span class="identifier">end</span><span class="special">());}</span>
 344 </pre>
 345 <h3>
 346 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h6"></a>
 347         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qpolygon"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.adaption_of_qpolygon">Adaption
 348         of QPolygon</a>
 349       </h3>
 350 <a name="adaption_of_qpolygon_source_code"></a><pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 351     <span class="keyword">namespace</span> <span class="identifier">geometry</span> <span class="special">{</span>
 352         <span class="keyword">namespace</span> <span class="identifier">traits</span> <span class="special">{</span>
 353             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">tag</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">polygon_tag</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 354             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">ring_const_type</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 355             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">ring_mutable_type</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 356             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">interior_const_type</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">CustomPolygonRingRange</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 357             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">interior_mutable_type</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">CustomPolygonRingRange</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 358
 359             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">exterior_ring</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span>
 360             <span class="special">{</span>
 361                 <span class="keyword">static</span> <span class="identifier">QRing</span><span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPolygon</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
 362                 <span class="special">{</span>
 363                     <span class="keyword">return</span> <span class="special">(*</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">exterior</span><span class="special">);</span>
 364                 <span class="special">}</span>
 365                 <span class="keyword">static</span> <span class="identifier">QRing</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPolygon</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
 366                 <span class="special">{</span>
 367                     <span class="keyword">return</span> <span class="special">(*</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">exterior</span><span class="special">);</span>
 368                 <span class="special">}</span>
 369             <span class="special">};</span>
 370
 371             <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">interior_rings</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span>
 372             <span class="special">{</span>
 373                 <span class="keyword">static</span> <span class="identifier">CustomPolygonRingRange</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPolygon</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
 374                 <span class="special">{</span>
 375                     <span class="keyword">return</span> <span class="identifier">CustomPolygonRingRange</span><span class="special">(</span><span class="identifier">PolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">PolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span class="identifier">end</span><span class="special">()));</span>
 376                 <span class="special">}</span>
 377                 <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">CustomPolygonRingRange</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">QPolygon</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
 378                 <span class="special">{</span>
 379                     <span class="keyword">return</span> <span class="identifier">CustomPolygonRingRange</span><span class="special">(</span><span class="identifier">ConstPolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">ConstPolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span class="identifier">end</span><span class="special">()));</span>
 380                 <span class="special">}</span>
 381             <span class="special">};</span>
 382         <span class="special">}</span>
 383     <span class="special">}</span>
 384 <span class="special">}</span> <span class="comment">// namespace boost::geometry::traits</span>
 385 </pre>
 386 <h4>
 387 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h7"></a>
 388         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_iterator_for_qrings_in_qpolygon"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_iterator_for_qrings_in_qpolygon">Boost.Iterator
 389         for QRings in QPolygon</a>
 390       </h4>
 391 <a name="adaption_of_qpolygon_iterator_source_code"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">I</span><span class="special">,</span> <span class="comment">// Line iterator type</span>
 392           <span class="keyword">class</span> <span class="identifier">R</span>  <span class="comment">// Point reference type</span>
 393          <span class="special">&gt;</span>
 394 <span class="keyword">class</span> <span class="identifier">PolyRingIterator</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_facade</span><span class="special">&lt;</span>
 395         <span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">R</span><span class="special">&gt;,</span> <span class="identifier">R</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">random_access_iterator_tag</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&gt;</span> <span class="comment">//new traversal tag</span>
 396 <span class="special">{</span>
 397 <span class="keyword">public</span><span class="special">:</span>
 398     <span class="identifier">PolyRingIterator</span><span class="special">()</span> <span class="special">{}</span>
 399
 400     <span class="keyword">explicit</span> <span class="identifier">PolyRingIterator</span><span class="special">(</span><span class="identifier">I</span> <span class="identifier">ringIter</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">_ringIter</span><span class="special">(</span><span class="identifier">ringIter</span><span class="special">)</span> <span class="special">{}</span>
 401
 402     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OtherI</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OtherR</span><span class="special">&gt;</span>
 403     <span class="identifier">PolyRingIterator</span><span class="special">(</span><span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">OtherI</span><span class="special">,</span> <span class="identifier">OtherR</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">:</span>
 404         <span class="identifier">_ringIter</span><span class="special">(</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">getRingIter</span><span class="special">())</span> <span class="special">{}</span>
 405
 406     <span class="identifier">I</span> <span class="identifier">getRingIter</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">_ringIter</span><span class="special">;}</span>
 407
 408     <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_facade</span><span class="special">&lt;</span><span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">R</span><span class="special">&gt;,</span> <span class="identifier">R</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">random_access_iterator_tag</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&gt;::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span>
 409
 410 <span class="keyword">private</span><span class="special">:</span>
 411     <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_core_access</span><span class="special">;</span>
 412
 413     <span class="keyword">void</span> <span class="identifier">increment</span><span class="special">()</span>
 414     <span class="special">{</span>
 415         <span class="special">++</span><span class="identifier">_ringIter</span><span class="special">;</span>
 416     <span class="special">}</span>
 417
 418     <span class="keyword">void</span> <span class="identifier">decrement</span><span class="special">()</span>
 419     <span class="special">{</span>
 420         <span class="special">--</span><span class="identifier">_ringIter</span><span class="special">;</span>
 421     <span class="special">}</span>
 422
 423     <span class="keyword">void</span> <span class="identifier">advance</span><span class="special">(</span><span class="identifier">difference_type</span> <span class="identifier">n</span><span class="special">)</span>
 424     <span class="special">{</span>
 425         <span class="identifier">std</span><span class="special">::</span><span class="identifier">advance</span><span class="special">(</span><span class="identifier">_ringIter</span><span class="special">,</span><span class="identifier">n</span><span class="special">);</span>
 426     <span class="special">}</span>
 427
 428     <span class="identifier">difference_type</span> <span class="identifier">distance_to</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">PolyRingIterator</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span>
 429     <span class="special">{</span>
 430         <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">_ringIter</span><span class="special">,</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getRingIter</span><span class="special">());</span>
 431     <span class="special">}</span>
 432
 433     <span class="keyword">bool</span> <span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">PolyRingIterator</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span>
 434     <span class="special">{</span>
 435         <span class="keyword">return</span> <span class="identifier">_ringIter</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">getRingIter</span><span class="special">();</span>
 436     <span class="special">}</span>
 437
 438     <span class="identifier">R</span> <span class="identifier">dereference</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="special">*(*</span><span class="identifier">_ringIter</span><span class="special">);}</span>
 439
 440     <span class="identifier">I</span> <span class="identifier">_ringIter</span><span class="special">;</span>
 441 <span class="special">};</span>
 442 </pre>
 443 <h4>
 444 <a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.h8"></a>
 445         <span class="phrase"><a name="geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_polygonringiterator"></a></span><a class="link" href="example_source_code__adapting_a_legacy_geometry_object_model.html#geometry.examples.example_source_code__adapting_a_legacy_geometry_object_model.boost_range_for_polygonringiterator">Boost.Range
 446         for PolygonRingIterator</a>
 447       </h4>
 448 <a name="adaption_of_qpolygon_range_source_code"></a><pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">*&gt;::</span><span class="identifier">iterator</span><span class="special">,</span> <span class="identifier">QRing</span><span class="special">&gt;</span> <span class="identifier">PolygonRingIterator</span><span class="special">;</span>
 449 <span class="keyword">typedef</span> <span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">QRing</span><span class="special">&gt;</span> <span class="identifier">ConstPolygonRingIterator</span><span class="special">;</span>
 450
 451 <span class="keyword">class</span> <span class="identifier">CustomPolygonRingRange</span>
 452 <span class="special">{</span>
 453     <span class="identifier">PolygonRingIterator</span> <span class="identifier">_begin</span><span class="special">;</span>
 454     <span class="identifier">PolygonRingIterator</span> <span class="identifier">_end</span><span class="special">;</span>
 455
 456     <span class="keyword">bool</span> <span class="identifier">isIterSet</span><span class="special">;</span>
 457
 458     <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">_cbegin</span><span class="special">;</span>
 459     <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">_cend</span><span class="special">;</span>
 460
 461     <span class="keyword">bool</span> <span class="identifier">isCIterSet</span><span class="special">;</span>
 462
 463 <span class="keyword">public</span><span class="special">:</span>
 464
 465     <span class="identifier">CustomPolygonRingRange</span><span class="special">(</span><span class="identifier">PolygonRingIterator</span> <span class="identifier">begin</span><span class="special">,</span> <span class="identifier">PolygonRingIterator</span> <span class="identifier">end</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">_begin</span><span class="special">(</span><span class="identifier">begin</span><span class="special">),</span> <span class="identifier">_end</span><span class="special">(</span><span class="identifier">end</span><span class="special">),</span> <span class="identifier">isIterSet</span><span class="special">(</span><span class="keyword">true</span><span class="special">)</span> <span class="special">{}</span>
 466     <span class="identifier">CustomPolygonRingRange</span><span class="special">(</span><span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">begin</span><span class="special">,</span> <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">end</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">_cbegin</span><span class="special">(</span><span class="identifier">begin</span><span class="special">),</span> <span class="identifier">_cend</span><span class="special">(</span><span class="identifier">end</span><span class="special">),</span> <span class="identifier">isCIterSet</span><span class="special">(</span><span class="keyword">true</span><span class="special">)</span> <span class="special">{}</span>
 467
 468     <span class="identifier">PolygonRingIterator</span> <span class="identifier">begin</span><span class="special">()</span>
 469     <span class="special">{</span>
 470         <span class="identifier">assert</span><span class="special">(</span><span class="identifier">isIterSet</span><span class="special">);</span>
 471         <span class="keyword">return</span> <span class="identifier">_begin</span><span class="special">;</span>
 472     <span class="special">}</span>
 473
 474     <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">cbegin</span><span class="special">()</span> <span class="keyword">const</span>
 475     <span class="special">{</span>
 476         <span class="identifier">assert</span><span class="special">(</span><span class="identifier">isCIterSet</span><span class="special">);</span>
 477         <span class="keyword">return</span> <span class="identifier">_cbegin</span><span class="special">;</span>
 478     <span class="special">}</span>
 479
 480     <span class="identifier">PolygonRingIterator</span> <span class="identifier">end</span><span class="special">()</span>
 481     <span class="special">{</span>
 482         <span class="identifier">assert</span><span class="special">(</span><span class="identifier">isIterSet</span><span class="special">);</span>
 483         <span class="keyword">return</span> <span class="identifier">_end</span><span class="special">;</span>
 484     <span class="special">}</span>
 485
 486     <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">cend</span><span class="special">()</span> <span class="keyword">const</span>
 487     <span class="special">{</span>
 488         <span class="identifier">assert</span><span class="special">(</span><span class="identifier">isCIterSet</span><span class="special">);</span>
 489         <span class="keyword">return</span> <span class="identifier">_cend</span><span class="special">;</span>
 490     <span class="special">}</span>
 491 <span class="special">};</span>
 492
 493 <span class="keyword">namespace</span> <span class="identifier">boost</span>
 494 <span class="special">{</span>
 495     <span class="comment">// Specialize metafunctions. We must include the range.hpp header.</span>
 496     <span class="comment">// We must open the 'boost' namespace.</span>
 497
 498     <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
 499     <span class="keyword">struct</span> <span class="identifier">range_iterator</span><span class="special">&lt;</span><span class="identifier">CustomPolygonRingRange</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">PolygonRingIterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 500
 501     <span class="keyword">template</span><span class="special">&lt;&gt;</span>
 502     <span class="keyword">struct</span> <span class="identifier">range_const_iterator</span><span class="special">&lt;</span><span class="identifier">CustomPolygonRingRange</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
 503
 504 <span class="special">}</span> <span class="comment">// namespace 'boost'</span>
 505
 506
 507 <span class="comment">// The required Range functions. These should be defined in the same namespace</span>
 508 <span class="comment">// as Ring.</span>
 509
 510 <span class="keyword">inline</span> <span class="identifier">PolygonRingIterator</span> <span class="identifier">range_begin</span><span class="special">(</span><span class="identifier">CustomPolygonRingRange</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 511     <span class="special">{</span><span class="keyword">return</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();}</span>
 512
 513 <span class="keyword">inline</span> <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">range_begin</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">CustomPolygonRingRange</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 514     <span class="special">{</span><span class="keyword">return</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">();}</span>
 515
 516 <span class="keyword">inline</span> <span class="identifier">PolygonRingIterator</span> <span class="identifier">range_end</span><span class="special">(</span><span class="identifier">CustomPolygonRingRange</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 517     <span class="special">{</span><span class="keyword">return</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">end</span><span class="special">();}</span>
 518
 519 <span class="keyword">inline</span> <span class="identifier">ConstPolygonRingIterator</span> <span class="identifier">range_end</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">CustomPolygonRingRange</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
 520     <span class="special">{</span><span class="keyword">return</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();}</span>
 521 </pre>
 522 </div>
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 525 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2017 Barend
 526       Gehrels, Bruno Lalande, Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its
 527       affiliates<p>
 528         Distributed under the Boost Software License, Version 1.0. (See accompanying
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