D: Overriding opDispatch in subclass

Question

Is there any way to override opDispatch in a subclass? What I actually want to do is to pass around a variable with the superclass as its static type, but which redirects calls to opDispatch to its sub-type (the dynamic type). Basically, I want this code to print "Sub" instead of "Super". ``` import std.stdio; class Super { void opDispatch(string m)() { writeln("Super"); } } class Sub : Super { override void opDispatch(string m)() { writeln("Sub"); } } void main() { Super s = new Sub(); s.callingOpDispatch; // Writes "Super" instead of "Sub" } ``` I'm dumbfounded, as I cannot force the compiler to look for method overrides by using abstract methods (D doesn't allow abstract templated methods). PS: Could someone please create the tag opDispatch? (It seems to me that it would be good for D?)

Accepted Answer

Member template functions cannot be virtual and hence cannot be overridden.

http://dlang.org/function.html#virtual-functions

opDispatch is templated function. These two calls are identical:

```
s.callingOpDispatch();
s.opDispatch!("callingOpDispatch")()
```

D: Overriding opDispatch in subclass

Solution

Problem