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26 <div class="titlepage"><div><div><h5 class="title">
27 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy"></a><a class="link" href="is_valid_3_with_message_and_strategy.html" title="is_valid (with message and strategy)">is_valid
28 (with message and strategy)</a>
29 </h5></div></div></div>
31 <a class="indexterm" name="idm46186995792272"></a>
32 Checks if a geometry is valid (in the OGC sense)
35 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h0"></a>
36 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.synopsis"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.synopsis">Synopsis</a>
40 <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">typename</span> <span class="identifier">Strategy</span><span class="special">></span>
41 <span class="keyword">bool</span> <span class="identifier">is_valid</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span> <span class="identifier">message</span><span class="special">,</span> <span class="identifier">Strategy</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">strategy</span><span class="special">)</span></pre>
45 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h1"></a>
46 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.parameters"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.parameters">Parameters</a>
48 <div class="informaltable"><table class="table">
86 Any type fulfilling a Geometry Concept
96 A model of the specified concept
115 A string containing a message stating if the geometry is valid
116 or not, and if not valid a reason why
128 Any type fulfilling a Is_valid Strategy Concept
138 The strategy which will be used for is_valid calculations
145 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h2"></a>
146 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.returns"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.returns">Returns</a>
149 Returns true if the geometry is valid (in the OGC sense); furthermore,
150 the following geometries are considered valid: multi-geometries with
151 no elements, linear geometries containing spikes, areal geometries with
152 duplicate (consecutive) points
155 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h3"></a>
156 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.header"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.header">Header</a>
162 <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">hpp</span><span class="special">></span></code>
168 <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">algorithms</span><span class="special">/</span><span class="identifier">is_valid</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
171 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h4"></a>
172 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.conformance"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.conformance">Conformance</a>
175 The function is_valid is not defined by OGC.
178 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h5"></a>
179 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.supported_geometries"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.supported_geometries">Supported
182 <div class="informaltable"><table class="table">
208 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
220 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
232 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
244 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
256 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
268 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
280 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
292 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
304 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
316 <span class="inlinemediaobject"><img src="../../../../img/ok.png" alt="ok"></span>
323 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h6"></a>
324 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.complexity"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.complexity">Complexity</a>
327 Constant-time for points, segments, boxes and multi-points
330 Linear for linestrings and multi-linestrings
333 Linearithmic for rings
336 Currently, worst-case quadratic for polygons and multi-polygons
339 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h7"></a>
340 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.example"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.example">Example</a>
343 Checks whether a geometry is valid and, if not valid, prints a message
344 describing the reason
348 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
349 <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span>
351 <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>
352 <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>
353 <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>
356 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
357 <span class="special">{</span>
358 <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>
359 <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>
361 <span class="identifier">polygon_type</span> <span class="identifier">poly</span><span class="special">;</span>
362 <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 10,10 10,10 0,0 0),(0 0,9 1,9 2,0 0),(0 0,2 9,1 9,0 0),(2 9,9 2,9 9,2 9))"</span><span class="special">,</span> <span class="identifier">poly</span><span class="special">);</span>
364 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">message</span><span class="special">;</span>
365 <span class="keyword">bool</span> <span class="identifier">valid</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">is_valid</span><span class="special">(</span><span class="identifier">poly</span><span class="special">,</span> <span class="identifier">message</span><span class="special">);</span>
366 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"is valid? "</span> <span class="special"><<</span> <span class="special">(</span><span class="identifier">valid</span> <span class="special">?</span> <span class="string">"yes"</span> <span class="special">:</span> <span class="string">"no"</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
367 <span class="keyword">if</span> <span class="special">(!</span> <span class="identifier">valid</span><span class="special">)</span>
368 <span class="special">{</span>
369 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"why not valid? "</span> <span class="special"><<</span> <span class="identifier">message</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
370 <span class="special">}</span>
372 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
373 <span class="special">}</span>
380 <pre class="programlisting">is valid? no
381 why not valid? Geometry has disconnected interior
383 <img src="../../../../img/algorithms/is_valid_example.png" alt="is_valid_example">
387 <a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.h8"></a>
388 <span class="phrase"><a name="geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.see_also"></a></span><a class="link" href="is_valid_3_with_message_and_strategy.html#geometry.reference.algorithms.is_valid.is_valid_3_with_message_and_strategy.see_also">See
391 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
392 <a class="link" href="../is_simple.html" title="is_simple">is_simple</a>
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