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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.core.closure"></a><a class="link" href="closure.html" title="closure">closure</a> |
| </h4></div></div></div> |
| <p> |
| <a class="indexterm" name="id915708"></a> |
| Metafunction defining <span class="bold"><strong>value</strong></span> as the closure |
| (clockwise, counterclockwise) of the specified geometry type. |
| </p> |
| <a name="geometry.reference.core.closure.synopsis"></a><h6> |
| <a name="geometry.reference.core.closure.synopsis-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">closure</span> |
| <span class="special">{</span> |
| <span class="comment">// ...</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <a name="geometry.reference.core.closure.template_parameter_s_"></a><h6> |
| <a name="geometry.reference.core.closure.template_parameter_s_-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.template_parameter_s_">Template |
| parameter(s)</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| typename Geometry |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <a name="geometry.reference.core.closure.header"></a><h6> |
| <a name="geometry.reference.core.closure.header-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.header">Header</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">closure</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The closure is defined for any geometry type, but only has a real meaning |
| for areal geometry types (ring, polygon, multi_polygon) |
| </p></td></tr> |
| </table></div> |
| <a name="geometry.reference.core.closure.complexity"></a><h6> |
| <a name="geometry.reference.core.closure.complexity-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.complexity">Complexity</a> |
| </h6> |
| <p> |
| Compile time |
| </p> |
| <a name="geometry.reference.core.closure.example"></a><h6> |
| <a name="geometry.reference.core.closure.example-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.example">Example</a> |
| </h6> |
| <p> |
| Examine if a polygon is defined as "should be closed" |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> |
| |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">polygon</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| |
| <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="identifier">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"><</span><span class="keyword">double</span><span class="special">></span> <span class="identifier">point_type</span><span class="special">;</span> |
| <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">polygon</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">></span> <span class="identifier">polygon_type</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">closure_selector</span> <span class="identifier">clos</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">closure</span><span class="special"><</span><span class="identifier">polygon_type</span><span class="special">>::</span><span class="identifier">value</span><span class="special">;</span> |
| |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"closure: "</span> <span class="special"><<</span> <span class="identifier">clos</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span> |
| <span class="special"><<</span> <span class="string">"(open = "</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">open</span> |
| <span class="special"><<</span> <span class="string">", closed = "</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">closed</span> |
| <span class="special"><<</span> <span class="string">") "</span><span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> |
| |
| <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| </pre> |
| <p> |
| </p> |
| <p> |
| Output: |
| </p> |
| <pre class="programlisting">closure: 1 |
| (open = 0, closed = 1) |
| </pre> |
| <a name="geometry.reference.core.closure.see_also"></a><h6> |
| <a name="geometry.reference.core.closure.see_also-heading"></a> |
| <a class="link" href="closure.html#geometry.reference.core.closure.see_also">See also</a> |
| </h6> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <a class="link" href="../enumerations/closure_selector.html" title="closure_selector">The |
| closure_selector enumeration</a> |
| </li></ul></div> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2011 Barend Gehrels, Bruno Lalande, Mateusz Loskot<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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