- CanDuplicate {dup} (~ has trivial copy constructor)
You can duplicate a value of the type with memcpy.

- CanDiscard {disc} (~ has trivial destructor)
You can discard a value of the type (without invoking destructor)

- CanRelocate {rel} (does not have a direct analogy)
You can move a value to a new address with memcpy (discarding the old value in the process).


Some examples:

Primitive types are {dup, disc, rel}
Unique ptr is {rel} (cannot be duplicated, must invoke code when discarded)
Shared ptr is {rel} (must invoke code in duplication, must invoke code when discarded)
Vector is {} (cannot be relocated because may hold a pointer to itself as part of SBO)
Event listener {} (must register itself when duplicated, unregister when discarded, and update its registration when relocated)