Sorry I did not understand what you meant. It would be better if you share the answer here. I found this also https://dlang.org/library/std/traits/key_type.html, but I dont know if it is related.
In the case where the AA-KeyType is a class (which is represented as a pointer in D) I want the equality (opEquals) and the hashing (toHash) of the AA to compare and hash the pointers themselves, not the fields the classes points to.
