_sig.Sig</a></span></code></div></div><h6 id="core-functions"><a href="#core-functions" class="anchor"></a>Core functions</h6><div class="odoc-spec"><div class="spec value anchored" id="val-op_to_str"><a href="#val-op_to_str" class="anchor"></a><code><span><span class="keyword">val</span> op_to_str : <span><a href="Shape/Type/index.html#type-op">Shape.Type.op</a> <span class="arrow">&#45;&gt;</span></span> string</span></code></div><div class="spec-doc"><p>return the name of the operator as string</p></div>