val general : ?hashable:'a Std_internal.Hashtbl.Hashable.t -> ?cache_size_bound:int -> ('a -> 'b) -> 'a -> 'b
Returns memoized version of any function with a single argument. The
default caching policy is to remember everything for the lifetime
of the returned closure, but one may specify an upper bound on
cache size. Whenever a cache entry must be forgotten in order to
obey this bound, we pick the least-recently-used one.
Raises an exception if cache_size_bound is nonpositive.