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();


}

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

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/