Template namespaces - Obsolete?

[Bill Baxter]

Janice Caron wrote:
> Now that we can do:
> class A(T);
> struct A(T);
> union A(T);
> T func(T)(T x);
> static int func(int n);
> ...
> etc.
> 
> Is there any need, any more, for the old fashioned
> 
> template t(T)
> {
>     int f();
>     int g();
> }

Mixins as you mention.
That also includes mixins as a work around for lack of inner namespaces.
I doubt macros will ever be able to create new namespaces.

Also it's just handy for cases where you have a few functions that all 
share the same collection of derived types etc.

template AutoRepair(CarType) {
    alias CarType.wheel_type Wheel;
    alias CarType.body_type Body;
    alias CarType.engine_type Engine;
    alias Engine.fuel_type Fuel;
    alias CarType.transmission_type Transmision;
    alias CarType.manufacturer manufacturer;

    // returns the new Engine
    Engine fix_engine(CarType car, Engine replacement_part) { ...
    }
    // returns the new body
    Body repair_body(CarType car, Body replacement_part) {  ...
    }
    /// etc...

}



--bb