Re: Virtual functions and destructors

Article View: comp.std.c++

Article #2535

#2535

From: Harald Fuchs
Date: Mon, 13 Nov 1995 13:08

21 lines
1911 bytes

herbs@interlog.com (Herb Sutter) writes:

> However, it might help Chris if we answered a related question using
> inheritance in the proper direction (down!):

> struct Base1 { virtual ~Base1() {}; }
> struct Base2 {         ~Base2() {}; }

> struct Derived : public Base1, public Base2 { ... };

> This question is, Is Derived::~Derived() virtual, since one of the bases has
> a virtual dtor and one doesn't?  This answer is, Yes: 'once virtual, always
> virtual' (in derived classes), just like with any virtual member function.

~Derived is virtual with respect to Base1, but AFAIK not with respect
to Base2.  If you delete a Derived* through a Base2*, all compilers I
know only call ~Base2 ().
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Path: arc1-ca.pugleaf.net!in2.uu.net!bounce-back
Date: 13 Nov 95 13:08:03 GMT
Approved: fjh@cs.mu.oz.au
From: hf@colibri.de (Harald Fuchs)
Newsgroups: comp.std.c++
Subject: Re: Virtual functions and destructors
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