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From: mh@awds26.imsd.contel.com (Mike Hoegeman)
Newsgroups: comp.lang.c++
Subject: how do you define classes that refer to each other ???
Message-ID: <49689@wlbr.IMSD.CONTEL.COM>
Date: 20 Mar 90 00:04:01 GMT
Sender: news@wlbr.IMSD.CONTEL.COM
Reply-To: mh@awds26.UUCP (Mike Hoegeman)
Organization: Contel FSD, Westlake Village, CA
Lines: 47


This is probably a stupid question, but here goes anyway.  how do you
set up two classes that refer to each other ?  Here's a simple example
to demonstrate my problem.


    class thing {
	int data[5];
	void execute(stack &s) {
	    s.push(this);
	}
    }

    class stack {
	stack_store thing[500];
	int si;
    private:
	void push(thing *t);
	stack() { 
	    si = 0; 
	}
    }

    void 
    stack::push(thing *t) {
	stack_store[si++] = *t;
    }

    main() {
	thing mything;
	stack mystack;

	mything.execute();
    }

Now, the question is. How do I properly forward declare class 'stack'
to class 'thing' so that everybody is happy ?

I have the stroustrup C++ book as well as the Dewhurst/Stark C++ book
so an admonishing "you'll find this on page <n> in Stroustrup you
moron" is fine :-). I've scanned through these two books but have not
found the answer.


thanks, 

- mike hoegeman, mh@wlbr.imsd.contel.com