• hhaammaadd (18/18) Aug 28 2011 import std.stdio;
• Jonathan M Davis (5/29) Aug 28 2011 Pointers are not polymorphic in D. Class references are, but if you have...
• Michel Fortin (8/37) Aug 29 2011 Actually, a pointer to a class is really a pointer to a reference to an

hhaammaadd <h.battel hotmail.com> writes:

import std.stdio;
class employee {
         void work() {
                 writeln("I am employee");
         }
}

class manager: employee {
         void work() {
                 writeln("I am manager");
                 }
}


void main() {
         employee e1 = new manager;//here
         e1.work();

         manager m3 = new manager;//--|here
         employee *e2 = &m3;//--------|
         e2.work();


}

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Monday, August 29, 2011 04:50:09 hhaammaadd wrote:
 import std.stdio;
 class employee {
          void work() {
                  writeln("I am employee");
          }
 }
 
 class manager: employee {
          void work() {
                  writeln("I am manager");
                  }
 }
 
 
 void main() {
          employee e1 = new manager;//here
          e1.work();
 
          manager m3 = new manager;//--|here
          employee *e2 = &m3;//--------|
          e2.work();
 
 
 }

Pointers are not polymorphic in D. Class references are, but if you have a 
pointer to a class, it assumes that the type is exactly that type and 
determines its function calls at compile time rather than at runtime.

- Jonathan M Davis

Michel Fortin <michel.fortin michelf.com> writes:

On 2011-08-29 01:58:30 +0000, Jonathan M Davis <jmdavisProg gmx.com> said:

 On Monday, August 29, 2011 04:50:09 hhaammaadd wrote:
 import std.stdio;
 class employee {
 void work() {
 writeln("I am employee");
 }
 }
 
 class manager: employee {
 void work() {
 writeln("I am manager");
 }
 }
 
 
 void main() {
 employee e1 = new manager;//here
 e1.work();
 
 manager m3 = new manager;//--|here
 employee *e2 = &m3;//--------|
 e2.work();
 
 
 }

 
 Pointers are not polymorphic in D. Class references are, but if you have a
 pointer to a class, it assumes that the type is exactly that type and
 determines its function calls at compile time rather than at runtime.

Actually, a pointer to a class is really a pointer to a reference to an 
object, since the reference is always with a class type. So "employee 
*" is in reality a pointer to a reference to an employee object.

-- 
Michel Fortin
michel.fortin michelf.com
http://michelf.com/