libs/geometry/doc/html/geometry/reference/algorithms/for_each/for_each_point_2_const_version.html

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  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version"></a><a class="link" href="for_each_point_2_const_version.html" title="for_each_point (const version)">for_each_point
  28           (const version)</a>
  29 </h5></div></div></div>
  30 <p>
  31             <a class="indexterm" name="id875733"></a>
  32 Applies function <span class="bold"><strong>f</strong></span> to each point.
  33           </p>
  34 <h6>
  35 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h0"></a>
  36             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.description"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.description">Description</a>
  37           </h6>
  38 <p>
  39             Applies a function <span class="bold"><strong>f</strong></span> (functor, having
  40             operator() defined) to each point making up the geometry
  41           </p>
  42 <h6>
  43 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h1"></a>
  44             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.synopsis"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.synopsis">Synopsis</a>
  45           </h6>
  46 <p>
  47 </p>
  48 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Functor</span><span class="special">&gt;</span>
  49 <span class="identifier">Functor</span> <span class="identifier">for_each_point</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">geometry</span><span class="special">,</span> <span class="identifier">Functor</span> <span class="identifier">f</span><span class="special">)</span></pre>
  50 <p>
  51           </p>
  52 <h6>
  53 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h2"></a>
  54             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.parameters"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.parameters">Parameters</a>
  55           </h6>
  56 <div class="informaltable"><table class="table">
  57 <colgroup>
  58 <col>
  59 <col>
  60 <col>
  61 <col>
  62 </colgroup>
  63 <thead><tr>
  64 <th>
  65                     <p>
  66                       Type
  67                     </p>
  68                   </th>
  69 <th>
  70                     <p>
  71                       Concept
  72                     </p>
  73                   </th>
  74 <th>
  75                     <p>
  76                       Name
  77                     </p>
  78                   </th>
  79 <th>
  80                     <p>
  81                       Description
  82                     </p>
  83                   </th>
  84 </tr></thead>
  85 <tbody>
  86 <tr>
  87 <td>
  88                     <p>
  89                       Geometry const &amp;
  90                     </p>
  91                   </td>
  92 <td>
  93                     <p>
  94                       Any type fulfilling a Geometry Concept
  95                     </p>
  96                   </td>
  97 <td>
  98                     <p>
  99                       geometry
 100                     </p>
 101                   </td>
 102 <td>
 103                     <p>
 104                       A model of the specified concept
 105                     </p>
 106                   </td>
 107 </tr>
 108 <tr>
 109 <td>
 110                     <p>
 111                       Functor
 112                     </p>
 113                   </td>
 114 <td>
 115                     <p>
 116                       Function or class with operator()
 117                     </p>
 118                   </td>
 119 <td>
 120                     <p>
 121                       f
 122                     </p>
 123                   </td>
 124 <td>
 125                     <p>
 126                       Unary function, taking a const point as argument
 127                     </p>
 128                   </td>
 129 </tr>
 130 </tbody>
 131 </table></div>
 132 <h6>
 133 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h3"></a>
 134             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.header"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.header">Header</a>
 135           </h6>
 136 <p>
 137             Either
 138           </p>
 139 <p>
 140             <code class="computeroutput"><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">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
 141           </p>
 142 <p>
 143             Or
 144           </p>
 145 <p>
 146             <code class="computeroutput"><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">algorithms</span><span class="special">/</span><span class="identifier">for_each</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
 147           </p>
 148 <h6>
 149 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h4"></a>
 150             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.conformance"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.conformance">Conformance</a>
 151           </h6>
 152 <p>
 153             The function for_each_point is not defined by OGC.
 154           </p>
 155 <p>
 156             The function for_each_point conforms to the std::for_each function of
 157             the C++ std-library.
 158           </p>
 159 <h6>
 160 <a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.h5"></a>
 161             <span><a name="geometry.reference.algorithms.for_each.for_each_point_2_const_version.example"></a></span><a class="link" href="for_each_point_2_const_version.html#geometry.reference.algorithms.for_each.for_each_point_2_const_version.example">Example</a>
 162           </h6>
 163 <p>
 164             Sample using for_each_point, using a function to list coordinates
 165           </p>
 166 <p>
 167 </p>
 168 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
 169
 170 <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>
 171 <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_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 172 <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">polygon</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 173 <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">io</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 174
 175
 176 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Point</span><span class="special">&gt;</span>
 177 <span class="keyword">void</span> <span class="identifier">list_coordinates</span><span class="special">(</span><span class="identifier">Point</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">)</span>
 178 <span class="special">{</span>
 179     <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">get</span><span class="special">;</span>
 180     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"x = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">get</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">p</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" y = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">get</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">p</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>
 181 <span class="special">}</span>
 182
 183 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
 184 <span class="special">{</span>
 185     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">point</span><span class="special">;</span>
 186     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">polygon</span><span class="special">&lt;</span><span class="identifier">point</span><span class="special">&gt;</span> <span class="identifier">poly</span><span class="special">;</span>
 187     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">read_wkt</span><span class="special">(</span><span class="string">"POLYGON((0 0,0 4,4 0,0 0))"</span><span class="special">,</span> <span class="identifier">poly</span><span class="special">);</span>
 188     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">for_each_point</span><span class="special">(</span><span class="identifier">poly</span><span class="special">,</span> <span class="identifier">list_coordinates</span><span class="special">&lt;</span><span class="identifier">point</span><span class="special">&gt;);</span>
 189     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 190 <span class="special">}</span>
 191 </pre>
 192 <p>
 193           </p>
 194 <p>
 195             Output:
 196           </p>
 197 <pre class="programlisting">x = 0 y = 0
 198 x = 0 y = 4
 199 x = 4 y = 0
 200 x = 0 y = 0
 201 </pre>
 202 </div>
 203 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 204 <td align="left"></td>
 205 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2012 Barend
 206       Gehrels, Bruno Lalande, Mateusz Loskot<p>
 207         Distributed under the Boost Software License, Version 1.0. (See accompanying
 208         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 209       </p>
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