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From: gt5595c@prism.gatech.EDU (BARTZ)
Newsgroups: comp.lang.c++
Subject: Derived/Base Class constructor relationship
Message-ID: <29534@hydra.gatech.EDU>
Date: 21 May 91 18:34:01 GMT
Distribution: na
Organization: Georgia Institute of Technology
Lines: 47

I have a question about derived class constructors.
Below is the skeleton of the problem.

class A
{
   A(int f1,int f2,double first ...); // Constructor of base class
   ...
};

class B : public A
{
	B(int g1,double first ...) : Matrix(g1,g1,first) {};
		 // Constructor for derived class
	...
};

The constructor for the base class works OK with the ellipse 
but the derived class construction does not work.  The base class
constructor is not called with the list of doubles.
    

The cfront output for this declaration

B  X(1,3,0.1,0.3,0.2);

looks something like this:

struct B __1X ;

( (__ct__6ClassA_FiT1d3 ( ((struct A *)(& __1X )), 1 , 3 , 0.1 ) ), (((& __1X )))) ;


instead of 

__ct__6ClassA_FiT1d3 ( ((struct A *)(& __1X )), 1 , 3 , 0.1 , 0.3, 0.2);


Is it not legal to pass variable length arguments through to 
base class constructors?

-----------------------------------------------------------------------
                           Michael Bartz
		Coding and Information Theory Laboratory
		   Georgia Institute of Technology
      School of Electrical Engineering, Atlanta, GA  30332-0250
		    E-MAIL: gt5595c@prism.gatech.edu
			PHONE: (404) 853-9362