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From: rb@cc.ic.ac.uk (Robin Becker)
Newsgroups: comp.lang.c++
Subject: Simple example results
Message-ID: <1991Feb14.165716.14417@cc.ic.ac.uk>
Date: 14 Feb 91 16:57:15 GMT
Organization: Imperial College Computer Centre
Lines: 68
Originator: rb@cc.ic.ac.uk
Nntp-Posting-Host: suns1cc

Someone posted the following simple inheritance example recently
here are the results from TC++ and Zortech 2.1

extern "C"
{
	#include <stdio.h>
}

class base
{
public: 
	virtual void whatami() { printf("I'm a base.\n"); }
	base() { printf("In the base constructor "); whatami(); }
	~base() { printf("In the base destructor "); whatami(); }
};

class derived : public base
{
public: 
/*	virtual void whatami() { printf("I'm a derived.\n"); } */
	derived() { printf("In the derived constructor "); whatami(); }
	~derived() { printf("In the derived destructor "); whatami(); }
};

class mostderived : public derived
{
public: 
	virtual void whatami() { printf("I'm a mostderived.\n"); }
	mostderived() { printf("In the mostderived constructor "); whatami(); }
	~mostderived() { printf("In the mostderived destructor "); whatami(); }
};

main()
{
	mostderived object;

	return 0;
}

should print according to the poster:

In the base constructor I'm a base.
In the derived constructor I'm a derived.
In the mostderived constructor I'm a mostderived.
In the mostderived destructor I'm a mostderived.
In the derived destructor I'm a derived.
In the base destructor I'm a base.

If it doesn't -- call your compiler vendor and complain.

Zortech (compiled with ztc -g test.cpp)
In the base constructor I'm a base.
In the derived constructor I'm a base.
In the mostderived constructor I'm a mostderived.
In the mostderived destructor I'm a mostderived.
In the derived destructor I'm a mostderived.
In the base destructor I'm a mostderived.

TC++ (Academic version only using default settings)
In the base constructor I'm a base.
In the derived constructor I'm a base.
In the mostderived constructor I'm a mostderived.
In the mostderived destructor I'm a mostderived.
In the derived destructor I'm a base.
In the base destructor I'm a base.


What can one say?  Who is right? Is symmetry important?