Re: need for friend function

James Kanze <>
Thu, 6 Dec 2007 03:49:51 -0800 (PST)
On Dec 5, 3:26 pm, "Victor Bazarov" <> wrote:

ManicQin wrote:

Why strousrup is advising not to use friends?

I am not sure who (or what) that is.

A misspelling of Stroustrup?

Friendship goes against the data/implementation hiding
principle. If you make something private, that's really only
for you to see.

I don't think that Stroustrup advises unconditionally against
friends. If he had felt that there was never a reason to use a
friend, he wouldn't have added the concept to the language.

The important thing, I think, is to consider friends as part of
the interface of your class. Don't (normally) make anything a
friend that isn't implemented as part of your class
implementation. Used correctly, friends increase encapsulation
and hiding.

James Kanze (GABI Software)
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