Friendship inheritance

[Marcin Vorbrodt]

Is friendship inherited? Meaning if:

class Base {
public:
friend FriendClass;
};

class Derived : public Base {
}

Is FriendClass also a friend of Derived? Or does the friendship need to be
explicitly granted?

Thanks,
Martin

[Andrey Tarasevich]

Re: Friendship inheritance

Marcin Vorbrodt wrote:
[color=blue]
> Is friendship inherited? Meaning if:
>
> class Base {
> public:
> friend FriendClass;
> };
>
> class Derived : public Base {
> }
>
> Is FriendClass also a friend of Derived?[/color]

No.
[color=blue]
> Or does the friendship need to be explicitly granted?[/color]

Yes.

--
Best regards,
Andrey Tarasevich
Brainbench C and C++ Programming MVP

[Artie Gold]

Re: Friendship inheritance

Andrey Tarasevich wrote:[color=blue]
> Marcin Vorbrodt wrote:
>
>[color=green]
>>Is friendship inherited? Meaning if:
>>
>>class Base {
>> public:
>> friend FriendClass;
>>};
>>
>>class Derived : public Base {
>>}
>>
>>Is FriendClass also a friend of Derived?[/color]
>
>
> No.
>
>[color=green]
>>Or does the friendship need to be explicitly granted?[/color]
>
>
> Yes.
>[/color]

Just to add (because I think it's well expressed) -- take a look at:

http://www.parashift.com/c++-faq-lite/friends.html

BTW - reading through the entire FAQ would be a good idea -- and
remarkably entertaining, too!

HTH,
--ag

--
Artie Gold -- Austin, Texas

[Shane Beasley]

Re: Friendship inheritance

"Marcin Vorbrodt" <mvorbro@eos.nc su.edu> wrote in message news:<bj5b4r$gu 4$1@uni00nw.uni ty.ncsu.edu>...
[color=blue]
> Is friendship inherited?[/color]

Friendship is not inherited, transitive, or reciprocal. Apparently,
enough people ask this that it's a FAQ:

<http://www.parashift.c om/c++-faq-lite/friends.html>

While you're there, read the rest of the FAQs:

<http://www.parashift.c om/c++-faq-lite/>

There is much knowledge to be had from those pages. :)

- Shane

[Big Brian]

Re: Friendship inheritance

> Is friendship inherited? Meaning if:[color=blue]
>
> class Base {
> public:
> friend FriendClass;
> };
>
> class Derived : public Base {
> }
>
> Is FriendClass also a friend of Derived? Or does the friendship need to be
> explicitly granted?[/color]

IMHO, you should take 5 minutes and try it with our favorite standard C++ compiler.