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layout: stdlib-reference
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# typealias DifferentialPtrPair\<T\>\.DifferentialElementType

## Signature

<pre>
<span class='code_keyword'>typealias</span> <a href="index.html" class="code_type">DifferentialPtrPair</a>&lt;<a href="index.html#typeparam-T" class="code_type">T</a>&gt;.<a href="differentialelementtype-0cj.html" class="code_type">DifferentialElementType</a> = 
    <a href="index.html#typeparam-T" class="code_type">T</a>.<a href="differential-0.html" class="code_type">Differential</a>;
</pre>