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virtual overhead

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Started by abdulla October 15, 2001 07:48 AM

0 comments, last by abdulla 22 years, 6 months ago

abdulla

164

Author

October 15, 2001 07:48 AM

does anyone know how much of a relative performance hit (relative to a normal function call) a virtual call takes in VC on a WinNT 5+ platform (fully 32bit) also after the function is found on the vtable and the amiguity for a class is resolved, do you still incur the performance hit everytime you call the function?

Stoffel

250

October 15, 2001 12:52 PM

quote:Original post by abdulla
does anyone know how much of a relative performance hit (relative to a normal function call) a virtual call takes in VC on a WinNT 5+ platform (fully 32bit)

One extra pointer dereference per call.

quote:
also after the function is found on the vtable and the amiguity for a class is resolved, do you still incur the performance hit everytime you call the function?

Yes.