When using COM boolean values are to be passed as VARIANT_BOOL which is declared in wtypes.h as short. There are also predefined values for true and false:

#define VARIANT_TRUE ((VARIANT_BOOL)-1)
#define VARIANT_FALSE ((VARIANT_BOOL)0)

Which is the best way to convert from VARIANT_BOOL to C++ bool type? Obvious variants are:

  1. compare with VARIANT_FALSE

  2. simply cast to bool

Other ways can be easily invented.

Which is the best way to do this - most readable, most standart-compliant, least prone to accidential bugs planting and least prone to issues with porting to 64-bit platforms?

c++ windows com interop boolean
Edit
Report