ier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">has_key</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<h6>
<a name="fusion.sequence.intrinsic.functions.has_key.h2"></a>
            <span class="phrase"><a name="fusion.sequence.intrinsic.functions.has_key.parameters"></a></s