VARIANT_BOOL Wrapper

CComBool is a class to prevent the misuse of the VARIANT_BOOL type. VARIANT_BOOL is a problem because its legal values are -1 and 0 instead of 1 and 0, making converting back and forth between bool, BOOL and VARIANT_BOOL problematic. CComBool supports the constructors and operators needed to convert between the three C++ Windows Boolean types. It also supports operator& and CopyTo for common COM client and server usage. CComBool is available here.