cvs.gedasymbols.org/archives/browse.cgi   search  
Mail Archives: djgpp/2003/03/15/16:03:39

Message-ID: <3E739182.6E629D7A@bluewin.ch>
Date: Sat, 15 Mar 2003 21:48:02 +0100
From: Simon Bachmann <simonbachmann AT bluewin DOT ch>
X-Mailer: Mozilla 4.7 [en] (X11; I; Linux 2.2.13 i586)
X-Accept-Language: en
MIME-Version: 1.0
Newsgroups: comp.os.msdos.djgpp
Subject: data access in nested classes
NNTP-Posting-Host: 213.3.167.100
X-Original-NNTP-Posting-Host: 213.3.167.100
X-Trace: news.bluewin.ch 1047761072 213.3.167.100 (15 Mar 2003 21:44:32 +0100)
Organization: Bluewin AG
Lines: 70
Complaints-To: abuse AT bluewin DOT ch
X-Original-NNTP-Posting-Host: 127.0.0.1
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
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;

}

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019