Storing the bumpalo buffer (or alternative) and reading back from it ?

[ThomasCartier]

Hi,

I need to store the hashmap key/values on disk and retrieve it later, without reinserting everything.
new_in + bumpalo seem to make it for the allocation part, but I am not sure how it can read from this buffer again, once the hashmap has been deleted.
A kind of from_buffer would be handy.
Or maybe there is an existing solution I missed?

[Amanieu]

hashbrown doesn't guarantee a stable layout and is not suitable for on-disk storage. You may want to consider rkyv for this instead.