Get symbols (and/or UDAs) of subclass from superclass

[James Blachly]

On 3/15/20 5:28 PM, Simen Kjærås wrote:
...
> Since toStringImpl will always call toStringBase, this could perhaps 
> better be modeled with a template mixin:
> 
> mixin template DerivedToString() {
>      override string toStringImpl() {
>          return this.toStringBase();
>      }
> }
> 
> class Derived2 : Base {
>      mixin DerivedToString!();
> }
> 
> This way, you can have all the logic of toString in the base class, and 
> the only thing a subclass will have to include is one line for the 
> mixin. In addition, since toStringImpl is abstract, the implementer of a 
> subclass will get a compile-time error if he or she forgets to do either 
> the mixin or override toStringImpl themselves.
> 
> -- 
>    Simen

Thanks to you and Basile for responses and distinct solutions to 
consider. I am working on the mixin approach now, but with a brief 
mixinline in each derived subclass, I do not even need to call a 
superclass method -- just write the display code once with UDA 
filtering. I think this is the most sensible approach, until something 
else unexpected comes up :)