protected inheritance modifier

[Wenjie]

Hello!


Suppose I have:

class B {
protected:
virtual ~B();
};

class D: public B {
public:
~D();
};


Is it a good practice to use "protected" in class B?

[Gianni Mariani]

Re: protected inheritance modifier

Wenjie wrote:[color=blue]
> Hello!
>
>
> Suppose I have:
>
> class B {
> protected:
> virtual ~B();
> };
>
> class D: public B {
> public:
> ~D();
> };
>
>
> Is it a good practice to use "protected" in class B?[/color]

only if you want methods in classes that inherit B be the only methods
able to delete B.

[stephan beal]

Re: protected inheritance modifier

Wenjie wrote:[color=blue]
> Suppose I have:
>
> class B {
> protected:
> virtual ~B();
> };
>
> class D: public B {
> public:
> ~D();
> };
>
>
> Is it a good practice to use "protected" in class B?[/color]

Not an answer to your question, but something to keep i mind:
Making your dtor protected will keep your class from being used in 3rd-party
custom memory-mgt code which calls the dtor directly (as in,
thefoo->~foo()).

--
----- stephan beal
Registered Linux User #71917 http://counter.li.org
I speak for myself, not my employer. Contents may
be hot. Slippery when wet. Reading disclaimers makes
you go blind. Writing them is worse. You have been Warned.

[Victor Bazarov]

Re: protected inheritance modifier

"stephan beal" <stephan@wander inghorse.net> wrote...[color=blue]
> Wenjie wrote:[color=green]
> > Suppose I have:
> >
> > class B {
> > protected:
> > virtual ~B();
> > };
> >
> > class D: public B {
> > public:
> > ~D();
> > };
> >
> >
> > Is it a good practice to use "protected" in class B?[/color]
>
> Not an answer to your question, but something to keep i mind:
> Making your dtor protected will keep your class from being used in[/color]
3rd-party[color=blue]
> custom memory-mgt code which calls the dtor directly (as in,
> thefoo->~foo()).[/color]

.... or indirectly, anywhere, as in

{
foo afoo;
...
} // afoo::~foo() is supposed to be called here

Victor