From: "OmniMeta" <meta AT abacom DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Need help with class stuff
Lines: 72
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 5.00.2014.211
X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2014.211
Message-ID: <TnNj3.667$3C2.65692@wagner.videotron.net>
Date: Fri, 16 Jul 1999 17:25:23 -0300
NNTP-Posting-Host: 207.253.161.51
X-Complaints-To: abuse AT videotron DOT net
X-Trace: wagner.videotron.net 932160115 207.253.161.51 (Fri, 16 Jul 1999 17:21:55 EDT)
NNTP-Posting-Date: Fri, 16 Jul 1999 17:21:55 EDT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

This program call a class function using a pointer to it.

Can someone please tell me why I get the warning :

tst.cpp(44) Warning:  converting from `void (Test::*)()' to `void (*)()'
tst.cpp(45) Warning:  converting from `void (Test::*)()' to `void (*)()'



Here is the little program :

#include <stdio.h> // printf
#include <conio.h> // clrscr getch

class Test
{
  void Print1();
  void Print2();

  public:

  void (*Action)(); // my pointer

  char select(char key);

}ClassTest;



int main()
{
  clrscr();
  printf("Type 1 or 2 : ");  fflush(stdout);

  do{}
  while( ClassTest.select(getch()) );

  ClassTest.Action();

  printf("\nPress a key to exit");
  fflush(stdout);

  getch();

 return 0;
}


char Test::select(char key)
{
  switch(key)
  {                                             // I get the warning at
   case '1': Action = &Print1; break; // this line
   case '2': Action = &Print2; break;      // And this line
    default : return 1;
  }
  return 0;
}

void Test::Print1()
{
 printf("\n\nHello !!!\nThis is what Print1 do.\n");
}


void Test::Print2()
{
 printf("\n\nHello !!!\nThis is what Print2 do.\n");
}