Re: Non-initialized class

From:

=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?= <Erik-wikstrom@telia.com>

Newsgroups:

comp.lang.c++

Date:

Tue, 28 Oct 2008 20:17:30 GMT

Message-ID:

<urKNk.3630$U5.23713@newsb.telia.net>

On 2008-10-28 20:53, ejstans wrote:

Hello,

I encountered something unfamiliar to me today and I would like some
clarifications. Unfortunately I don't have access to a standard but
even if I did, I'm not even sure if I could understand it well enough
to answer my question...

Here's the deal: without instantiating the class, the code in question
calls both static and non-static member functions like this:

class foo {
public:
    static void bar() { std::cout << "bar" << std::endl; }
    void bar2() { std::cout << "bar2" << std::endl; }
};

void
func(foo* f)
{
    f->bar();
    f->bar2();
}

int
main()
{
   func(NULL);
   return 0;
}

Is this allowed? And if it is, does a situation exist where it would
be an advisable way of doing things?

No, this is not allowed. The reason it works is because you are not
trying to access any class member and the way the compiler generates to
code. It is never advisable to do something like this.

Note though that you can always access static member functions without
an object using the foo::bar() notation.

--
Erik Wikstr??m