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From: pcb@usl.usl.edu (Peter C. Bahrs)
Newsgroups: comp.lang.c++
Subject: Pointers to Methods Question
Message-ID: <797@usl.usl.edu>
Date: 30 Apr 89 20:15:16 GMT
Organization: CACS, Lafayette, LA, USA
Lines: 53


Very recently someone (??) put a question about virtual pointers et.al.
on the net.  I typed a variation of this in and am not sure why I receive
the results below? Any comments?

Script started on Sun Apr 30 14:10:33 198
-pcb--> cat b.c
#include <stream.h>

class What {
public:
  What (void) { cout << form("Construct What\n"); }
  void virtual print();
};

void What::print()
{
  cout << form ("I am What's print routine\n");
}

class Where : public What {
public:
  Where (void) { cout << form("Construct Where\n"); }
  void print(void) { cout << form ("Where's print routine\n"); }
};

main ()
{
  typedef void What::WhatMember();
  typedef void Where::WhereMember();
  What* x = new What;
  Where* y = new Where; 
  
  WhatMember* fp1;
  WhereMember* fp2;
  fp1 = &Where::print;
  (x->*fp1)();
  fp2 = &Where::print;
  (y->*fp2)();
}


-pcb--> CC b.c -o b
CC  b.c:
cc   -o b  b..c /usr/local/lib/libC.a
-pcb--> b
Construct What
Construct What
Construct Where
I am What's print routine
Where's print routine
-pcb--> ^D
script done on Sun Apr 30 14:11:07 198