description	Learn more about: Compiler COM Support Classes
title	Compiler COM Support Classes
ms.date	11/04/2016
helpviewer_keywords	cl.exe compiler, COM support COM, compiler support
ms.assetid	6d800d9b-b902-4033-9639-740a30b06f88

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

See also

Compiler COM Support
Compiler COM Global Functions
C++ Language Reference