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  #1  
Old 08-02-2007
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why constructor cannot be virtual
helo i read many books but i cant find the proper answer that why
constructor cannot be virtual
can u explain me in simple term that why constructor cannot be virtual
Regards,
Amit
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  #2  
Old 08-02-2007
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Because some properties of a virtual function does not apply to constructor such as "run time binding", besides why would you want a virtual constructor ???
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Old 08-03-2007
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Quote:
Originally Posted by amitpansuria View Post
can u explain me in simple term that why constructor cannot be virtual
Virtual works by the object pointing to a v-table, and the caller dereferencing the call via the v-table. Immediately prior to construction time you don't have an object which points to a vtable to make the call.

Solutions to this include using factory objects, which is exactly what COM does with IClassFactory so the call to CreateInstance is virtual. Similarly IBM's SOMClass::somNew.
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