Message-ID: <3E739182.6E629D7A@bluewin.ch>
Date: Sat, 15 Mar 2003 21:48:02 +0100
From: Simon Bachmann <simonbachmann AT bluewin DOT ch>
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Newsgroups: comp.os.msdos.djgpp
Subject: data access in nested classes
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello!

I've got a problem with gpp(version 3.1), I don't know if it's a problem
of gpp intself or of the ported vesion. I've got gcc under linux too,
and here the problem doesn't exist, but it's another version.... (2.7).

That's the problem:
wen I create two nested classes and try to access from the one to the
other's private data, (without making it a friend) the compiler should
give me an error message. Well, it doesn't! 

Here's an example:

#include <iostream>
using namespace std;

class One {
public:
	class Two; 		//this two lines should be necessary but they are not !! 
	friend class Two;	//commenting them and compiling I get no error
messagges
				//compilatino under linux with this lines commented fails
	
	class Two {
	
	friend class One;  	//This line is necessary under both dos and linux
	
	public:
		void ini();
		int val_one(One *);
	private:
		int t;
	};
	
	void ini();
	
	int val_two(Two *);
private:
	int o;		
};



void One::ini() {
	o = 1;
}

void One::Two::ini() {
	t = 2;
}	

int One::val_two(Two * p) {
	return p->t;
}

int One::Two::val_one(One * p) {
	return p->o;
}

main () {
	One o_1;
	One::Two o_2;
	
	o_1.ini();
	o_2.ini();
	
	cout << endl << "One::o = " << o_2.val_one( &o_1 ) << endl 
		<< "Two::t = " << o_1.val_two( &o_2) << endl << endl;

}