description Learn more about: declval Function title declval Function ms.date 11/04/2016 f1_keywords ppltasks/stdx::declval ms.assetid 9f57ba7a-e050-4ea6-80c6-8b5a38e958f5 declval Function Syntax template<class _T> _T&& declval(); Parameters _T Return Value Requirements Header: ppltasks.h Namespace: stdx See also stdx Namespace