Struct Comparison

[bearophile]

dsimcha:

> Similar stuff could be done for a generic opCmp that gives a
> struct an arbitrary total ordering as long as all of its members have a total
> ordering.

I have a similar structCmp in my dlibs, it's used by the Record/record (similar to the Tuple/tuple of Phobos2). It works recursively.
I'd like all D structs to have such richer semantics (opCmp, opHash, opEquals, a good printing), so Tuple can be removed from the std lib.

Bye,
bearophile