Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!SIRIUS.RISC.COM!ckl
From: ckl@SIRIUS.RISC.COM (Carl K. Lim)
Newsgroups: comp.lang.c++
Subject: problem with virtual function
Message-ID: <9008201757.AA23899@sirius.risc.com>
Date: 20 Aug 90 17:57:21 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 30


Hello.  I have this problem: when I'm calling a virtual function from a parent
class's constructor, it fails to execute the derived class's function.  For
example, in the following program, when B is declared, print() is called from
A's constructor.  But instead of looking up the B::print(), A::print() is
called instead.  Has anybody run into this kind of problem?  Is there a way
to get around it?

	#include <stdio.h>

	class A
	{
	public:
	  A() { print(); }
	  virtual void print() { printf("A\n"); }
	};


	class B : public A
	{
	public:
	  B() {}
	  void print() { printf("B\n"); }
	};


	int main()
	{
	  B b;
	}