Re: error gcc 4 and friend class

From:

"Alf P. Steinbach" <alfps@start.no>

Newsgroups:

comp.lang.c++

Date:

Fri, 26 Feb 2010 12:04:59 +0100

Message-ID:

<hm89sv$oae$1@news.eternal-september.org>

* maxime_phan@hotmail.com:

Hello, I have a big problem porting a huge c++ application on MacOS X
and gcc 4
here is my problem:
I have a code look like that in a header:

#if(defined(NOMCLASS))

class NOMCLASS {
... //some code
...
friend class MACRO1(TOTO); //MACRO is a macro define somewhere
friend class MACRO1(TATA);
}

#endif

And you write else-thread that

in the company i am, c++ templates are forbiden, so i guess this
system macro is done to replace them

This is just so braindead that it /hurts/ to read about it. You really have my
sympathy working there! But you're looking for a technical solution to

unfortunately, there is sometime where MACRO1(TOTO) is replaces by the
same name than NOMCLASS, fo exemple c_TOTO i have then:
class c_TOTO {
... //some code
...
friend class c_TOTO;
...

I don't know of any good solution, but I suggest that if it's practically
possible you replace C++ friendship with inheritance from a common base class.

The details of that will depend on your concrete classes.

that was no problem under visual studio, but in that case, i have the
following error: c_TOTO implicitly friends with itself.

how can I remove that error? I cannot change the code, it's huge and
occur many time. but i try to find some trick like if NOMCLASS equal
to MACRO1(TOTO); then don't compile the line friend class c_TOTO; but
it's preprocessor token and macro i don't think i can "compare"...

anybody have idea to help me about that?
thanks in advance.

Cheers & hth.,

- Alf