On Thursday, July 16, 2015 at 12:25:01 PM UTC-4, Matt Bauman wrote: > > On Thursday, July 16, 2015 at 12:19:25 PM UTC-4, milktrader wrote: >> >> Also, back to the OP question, is the correct solution to simply define >> >> Base.hash(f::Foo) = f.x >> > > No, I'd define Base.hash(f::Foo) = hash(f.x, 0x64c74221932dea5b), where I > chose the constant by rand(UInt). This way it won't collide with other > types. I really need to spend a bit more time with my interfaces chapter > and add this info there. >
Gah, that won't work on 32 bit, sorry. The current idiom for this in base is something like: const _foo_seed = UInt === UInt64 ? 0x64c74221932dea5b : 0x80783eb4 Base.hash(f::Foo) = hash(f.x, _foo_seed) It'd be nice to make this easier.
