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From: dsouza@gwen.cad.mcc.com (Desmond Dsouza)
Newsgroups: comp.lang.c++
Subject: Re: protected member functions
Message-ID: <DSOUZA.91Mar15165754@gwen.cad.mcc.com>
Date: 15 Mar 91 22:57:54 GMT
References: <1991Mar14.215717.28199@asc.slb.com>
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Organization: MCC CAD Program, Austin, Texas
Lines: 27
In-reply-to: wkd@asc.slb.com's message of 14 Mar 91 21:57:17 GMT


wkd@asc.slb.com (Bill Duttweiler) asks:

  >Is it illegal to call a protected member function on an instance other
  >than 'this'? Consider the following simple example:

The derived class has access to inherited protected data members
within the context of ANY object OF ITS CLASS, not just "this" (also
of further derived classes). See ARM, p. 253

class A { protected: int i; };

class B : public A {
public:
  foo (B* bp, A* ap)
	{ bp->i = 5;	// OK
	  ap->i = 5;	// ERROR: 
	}
};

-- 
Desmond.
--

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