Tim Kientzle 716b58e956 Handle ObjC -hash differently for Equatable and non-Equatable types ...

For an Equatable type, we need a hash implementation that
is compatible with any possible definition of `==`.
Conservatively, that means `-hash` must return a constant.

For non-Equatable types, we know that `==` is identity based,
so we can get better hash behavior by using the object address.

Caveat:  This means that non-Equatable types will do two
protocol conformance checks on every call to `hash`.

2023-10-31 14:26:20 -07:00

..

SwiftObjectNSObject.m

Handle ObjC -hash differently for Equatable and non-Equatable types

2023-10-31 14:26:20 -07:00