On 2012-11-09 14:36, Jack Applegame wrote:
This code:
import std.stdio;
class A {
void func() { writeln("A"); }
}
class B : A {
override void func() { writeln("B"); }
}
void main() {
A a = new A;
B b = new B;
auto dg = &a.func;
dg();
dg.ptr = cast(void*)b;
dg();
}
outputs:
A
A
but expected:
A
B
This is expected behavior. Delegates do not perform any dynamic
dispatch. The method that is called is chosen when the delegate is
created, i.e. "auto dg = &a.func;"
You can workaround this by calling another method in "A" that will call
the actual method you want to call, something like this:
class A
{
void resolveVirtualCall ()
{
func();
}
}
auto dg = &a.resolveVirtualCall;
--
/Jacob Carlborg
