Allowing arbitrary types for a function's argument and return type

[pineapple via Digitalmars-d-learn]

On Thursday, 22 October 2015 at 13:58:56 UTC, Adam D. Ruppe wrote:
> D's templates are easy (you actually used one in there, the 
> Generator is one!)
>
> Try this:
>
> import std.concurrency;
> Generator!T sequence(T)(T i){
>     return new Generator!T({
>         yield(i);
>         while(i > 1){
>             yield(i = (i % 2) ? (i * 3 + 1) : (i >> 1));
>         }
>     });
> }

Wonderful, thanks much! It keeps surprising me how easy it is to 
do stuff like this.