在C ++中将void对象用作通用对象类型

Question

I have a dll that honours an interface I was given. In this there are a number of methods that rely on an object type defined in a header I do not have. For example

STDMETHOD(OnPrepareNextScan)(BOOL* isSurvey, long curExp, ExtractMethod* pEM,
            unsigned long scanTime, double* selectedMass, double* selectedIntensity) = 0;

The header defines the ExtrctMethod type However, I dot care about this object, I am not going to use it, so I as wondering if I could use a void pointer instead.

Answer 1

Just use a forward declaration to enable the undefined type, and pass a NULL to the function.

class ExtractMethod;

OnPrepareNextScan(isSurvey, curExp, NULL, scanTime, selectedMass, selectedIntensity);