psis"></a></span><a class="link" href="is_valid_2_with_failure_value.html#geometry.reference.algorithms.is_valid.is_valid_2_with_failure_value.synopsis">Synopsis</a>
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<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">&gt;</span>
<span class="keyword">bool</span> <span class="identifier">is_valid</span><span class="special">(</span><span c