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BUG in Visual C++ access for destructors with virtual base classes

, 5 Apr 2000
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When inheriting from a virtual base class the access specifier for the destructor is ignored

Introduction

This bug appears in VC6 SP3, and possibly earlier versions as well.

When inheriting from a virtual base class the access specifier for the destructor is ignored

To demonstrate, if the word virtual is commented out as shown below in the declaration of class B, this program correctly produces the error message

 xxx.cpp(28) : error C2248: 'B::~B' : cannot
 access protected member declared in class 'B'
 xxx.cpp(23) : see declaration of 'B::~B'

If the word virtual is un-commented then the program builds without error messages despite the destructor being declared private

The offending code

#include "stdafx.h"

class A {
protected:
    ~A() {}
};

class B : virtual public A {
private:
    ~B() {}
};

int main(int argc, char* argv[])
{
    B b;
    return 0;
}

As a bit of history, I am implementing some smart pointers and want to ensure that the smart-pointer target object cannot be created locally on the stack, nor do I want to be able to explicitly call delete on a pointer to such an object. Hence I want the destructor to be private. However, this fails (as shown above) when I am inheriting from a virtual base class.

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About the Author

Roger Onslow

United States United States
No Biography provided

Comments and Discussions

 
GeneralVC++ compiler bug Pinmemberisheu26-Aug-08 2:28 
QuestionShould be virtual? PinmemberAlexMarbus10-May-01 2:50 
AnswerRe: Should be virtual? PinmemberAnonymous10-May-01 6:09 
GeneralBeside the point PinsussRoger Onslow10-Apr-00 15:45 
GeneralC++ Compiler bug PinsussDave Lorde10-Apr-00 0:05 
GeneralC++ compiler BUG PinsussAlex Turc6-Apr-00 1:25 

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