Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!mcsun!sunic!bmc!kuling!fredriks
From: fredriks@kuling.UUCP (Fredrik Stax{ng)
Newsgroups: comp.lang.c++
Subject: Pointers to member functions.
Message-ID: <1285@kuling.UUCP>
Date: 11 Dec 89 18:55:24 GMT
Organization: DoCS, Uppsala University, Sweden
Lines: 50


	I think the following piece of code would work. In The C++
Language Reference Manual 2.0 sec 5.4 it says:
	Pointer to member may be explicitly converted ... when the two
	type are pointers to member functions of classes derived from each
	other.
However my C++ compiler refuses to compile this (error: cast to member).
It is HCR C++ ver 2.01. 
	Is this supposed to work? If not, why not? (I know it is unsafe,
but it would be very un-C to disallow it because of that.)


class Base {
 public:
    void	Error() ;
} ;

typedef void (Base::*PMemF)() ;

class Derived: public Base {
 public:
    void	F1() ;
} ;


    
main() {
    PMemF	P3 ;

    P3 = (PMemF)(Derived::F1) ;
}


Fredrik Stax{ng                | C looks like a mix of Algol and TECO.
CS Student@Uppsala University  |              -- KPJ Jaakkola
fredriks@kuling.docs.uu.se     |
    
    






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-- 
Fredrik Stax{ng                | C looks like a mix of Algol and TECO.
CS Student@Uppsala University  |              -- KPJ Jaakkola
fredriks@kuling.docs.uu.se     |