ometry.reference.algorithms.is_valid.is_valid_2_with_message.example"></a></span><a class="link" href="is_valid_2_with_message.html#geometry.reference.algorithms.is_valid.is_valid_2_with_message.example">Example</a>
          </h6>
<p>
            Checks whether a geometry is valid and, if not valid, prints a message
            describing the reason
          </p>
<p>
</p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostre