Size of obj having only void mem F() why?

what would be the size of the obj of a class which is having only void member functions , Why is the main part of question?

Please refer http://www.research.att.com/~bs/bs_f...l#sizeof-empty

Regards,

Paresh.

Note:

If the empty class contains virtual functions, then the size is likely to be the same as the size of a pointer.