CCPersistentHashtbl
Persistent hash-table on top of OCaml's hashtables
Almost as efficient as the regular Hashtbl type, but with a persistent interface (rewinding changes to get back in the past history). This is mostly useful for backtracking-like uses, or forward uses (never using old values).
This module is not thread-safe.
module type HashedType = sig ... end
module type S = sig ... end