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package phashtbl
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open_new filename creates a new persistent hashtbl. dbm will create filename.dir and filename.pag files.
open_existing filename opens an existing persistent hashtbl for reading and writing. The files filename.dir and filename.pag must already exist.
val close : 'a t -> unitclose pht closes the previously opened pht.
val mem : 'a t -> 'a -> boolmem pht key checks if key is bound in pht.
val add : 'a t -> 'a -> string -> unitadd pht key value binds key to value in pht. Raises Dbm_error if key is already bound in pht.
val replace : 'a t -> 'a -> string -> unitreplace pht key value binds key to value in pht. If pht already contains a binding for key, that previous binding is discarded and replaced by value.
val remove : 'a t -> 'a -> unitremove pht key removes key and its bound value from pht. If key is unbound in pht, raises Dbm_error.
val find : 'a t -> 'a -> stringfind pht key finds the value bound to key in pht or raises Not_found if key is unbound.
val iter : ('a -> string -> unit) -> 'a t -> unititer f pht calls f key value on each (key, value) binding from pht.
val fold : ('a -> string -> 'c -> 'c) -> 'a t -> 'c -> 'cfold f pht init folds f over pht with init as the initial accumulator.