module Counter:
sig
type'a
t ='a Biocaml_accu.counter
val add : 'a Biocaml_accu.counter -> 'a -> int -> unit
val tick : 'a Biocaml_accu.counter -> 'a -> unit
val stream : 'a Biocaml_accu.counter -> ('a * int) Stream.t
val of_stream : 'a Stream.t -> 'a Biocaml_accu.counter
end