/vdn - Suppress or Enable Virtual Base Class

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This option, /vdn where n is zero or one, apply only to C++ code that uses virtual bases. If a derived class overrides a virtual function that it inherits from a virtual base class, and a constructor or a destructor for the derived base class calls that function using a pointer to the virtual base class, the compiler may introduce additional hidden vtordisp fields into the classes with virtual bases.

/vd{0|1}

The /vd0 option suppresses the addition of the hidden vtordisp constructor or destructor displacement member. The /vd1 option, the default, enables them where they are necessary. Turn off vtordisps only if you are sure that all class constructors and destructors call virtual functions virtually.

The /vd option affects an entire compilation module. Use the vtordisp pragma to suppress and then re-enable vtordisp fields on a class-by-class basis.

See Also

About Microprocessor Compilers | ARM Guide | Hitachi Guide | MIPS Guide

 Last updated on Thursday, April 08, 2004

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