A constructor cannot be virtual because at the time when the constructor is invoked the virtual table would not be available in the memory. Hence we cannot have a virtual constructor.
I think the only way to create a "virtual constructor" is to make a virtual method that returns the object inquestion, where derived classes return a copy of their type instead of the base classes return implementation.
By casting a derived type to a base type and invoking the virtual constructor method, you're constructing an object virtually, therefore it's safe to say it is a "virtual constructor".
constructor can't be defined as virtual bcuz if a class contains virtual function then the associate vtable must be initiated by the constructor of that class.if we define constructor as virtual then it creates a problem that who initiates that vtable.
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