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From: euaeny@euas10c19.ericsson.se (Erik Nyquist)
Newsgroups: comp.lang.c++
Subject: Pointer to member function - Bug???
Message-ID: <2580@erix.ericsson.se>
Date: 28 Dec 89 15:34:48 GMT
Sender: news@erix.ericsson.se
Reply-To: euaeny@euas18.ericsson.se (Erik Nyquist)
Organization: Ellemtel Utvecklings AB, Stockholm, Sweden
Lines: 51

According to "C++ - Reference Manual", page 26:
"A pointer to a member of class B may be 
 assigned to a pointer to a member of 
 class D of the same type provided D is 
 derived from B (directly or indirectly)
 by public derivation."

I wanted to try this with the program below. 

The Sun C++-compiler gives the following error 
message: 

CC  +g pointer-to-member.C:
"pointer-to-member.C", line 30: error: bad assignment type: void (B::*)(char *) = void (D::*)(char *)
*/

Why isn't the program accepted?

//------------------------------

#include <stream.h>

#define NL <<"\n"

class B {
public:
  B(){}
  void b_method(char* cp) { cout << "Base: " << cp NL; }
};

class D : public B {
public:
  D(){}
  void d_method(char* cp) { cout << "Derived:" << cp NL; }
};

main(){
  D d;
  void (B::*bfunction)(char*) = B::b_method;
  (d.*bfunction)("Hallo, World!");
  bfunction = D::d_method;
  (d.*bfunction)("Goodbye, World!");
}

-----------------------------------------------------------
Erik Nyquist           	   Tel: +46 - 8 719 9603
Ellemtel Utvecklings AB    email: euaeny@euas18.ericsson.se
Box 1505
S- 125 25 Stockholm
Sweden
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