Compiler COM Support Classes

The latest version of this topic can be found at Compiler COM Support Classes.

Microsoft Specific**

Standard classes are used to support some of the COM types. The classes are defined in comdef.h and the header files generated from the type library.

Class	Purpose
_bstr_t	Wraps the `BSTR` type to provide useful operators and methods.
_com_error	Defines the error object thrown by _com_raise_error in most failures.
_com_ptr_t	Encapsulates COM interface pointers, and automates the required calls to `AddRef`, Release, and `QueryInterface`.
_variant_t	Wraps the VARIANT type to provide useful operators and methods.

END Microsoft Specific