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A helper function template that retrieves the GUID of a runtime class, coclass, or interface; that is, the identifier of the WinRT type. For COM and WinRT interfaces, that's the identifier of the interface. For WinRT classes, it's the identifier of the default interface of the class.
It's only if and when guid_v (see the function's implementation) isn't specialized that the function falls back to using __uuidof, where applicable.
Syntax
template <typename T>
constexpr winrt::guid const& guid_of() noexcept;
Template parameters
typename T
The type of the runtime class, coclass, or interface whose GUID you wish to retrieve.
Return value
A winrt::guid value containing the globally unique identifier of T.
Requirements
Minimum supported SDK: Windows SDK version 10.0.17134.0 (Windows 10, version 1803)
Namespace: winrt
Header: %WindowsSdkDir%Include<WindowsTargetPlatformVersion>\cppwinrt\winrt\base.h (included by default)