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layout: stdlib-reference
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# IDifferentiableFunc\<TR, each TP\>\.operator\(\)

## Description





## Signature 

<pre>
<a href="index.html#typeparam-TR" class="code_type">TR</a> <a href="index.html" class="code_type">IDifferentiableFunc</a>&lt;<a href="index.html#typeparam-TR" class="code_type">TR</a>, <span class="code_keyword">each</span> <a href="index.html#typeparam-TP" class="code_type">TP</a>&gt;.operator()(
    <a href="index.html#typeparam-TP" class="code_type">TP</a> <a href="operatorx28x29.html#decl-p" class="code_param">p</a>)
    <span class='code_keyword'>where</span> <a href="index.html#typeparam-TR" class="code_type">TR</a> : <a href="../idifferentiable-01/index.html" class="code_type">IDifferentiable</a>
    <span class='code_keyword'>where</span> <a href="index.html#typeparam-TP" class="code_type">TP</a> : <a href="../idifferentiable-01/index.html" class="code_type">IDifferentiable</a>;

</pre>

## Parameters

####  <a id="decl-p"></a>p  : [TP](index.html#typeparam-TP)