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layout: stdlib-reference
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# IBwdCallable\<FType\>\.operator\(\)

## Description





## Signature 

<pre>
<a href="index.html" class="code_type">IBwdCallable</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>&gt;.operator() : <a href="../../types/bwdcallablefunctype-03bf/index.html" class="code_type">BwdCallableFuncType</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>, <a href="index.html" class="code_type">IBwdCallable</a>&lt;<a href="index.html#typeparam-FType" class="code_type">FType</a>&gt;.<span class="code_keyword">This</span>&gt;
</pre>