CComObjectRootEx
CComObjectRootEx is a class template provided by the Active Template Library (ATL) in Microsoft's Visual C++ development environment. It is a fundamental part of ATL's support for creating COM objects. This class manages the reference counting and aggregation of COM objects implemented using ATL.
The template parameter of CComObjectRootEx, typically named `t`, specifies the threading model the COM object will
CComObjectRootEx handles the internal workings of COM object lifetimes, including incrementing and decrementing the reference count.