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From: mittle@blinn.watson.ibm.com (Josh Mittleman)
Newsgroups: comp.lang.c++
Subject: Re: Help needed in c++
Message-ID: <1991Jun19.171504.25707@watson.ibm.com>
Date: 19 Jun 91 17:15:04 GMT
References: <3257@odin.cs.hw.ac.uk>
Sender: @watson.ibm.com
Organization: IBM T. J. Watson Research
Lines: 20

In article <3257@odin.cs.hw.ac.uk>, marina@cs.hw.ac.uk (Marina Georgiadou)
writes: 

> class A{
> // ...
> public :
> 	virtual int f() const;
> //...
> };

> Does anybody know the meaning of this const postfix ??

It indicates that the member function will not modify *this.  It allows the
member function to be safely applied to a const object.  Invoking a
non-const member function on a const object is an error.  See ARM p.177 for
details.

===========================================================================
Josh Mittleman (mittle@watson.ibm.com or joshua@paul.rutgers.edu)
J2-C28 T.J. Watson Research Center, PO Box 704, Yorktown Heights, NY  10598