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(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(* copy of this software and associated documentation files (the "Software"),*)
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(* Software is furnished to do so, subject to the following conditions:      *)
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type t

(** A [period] is a non-negative integer. *)
type period = t

include Compare.S with type t := t

val encoding : period Data_encoding.t

val rpc_arg : period RPC_arg.t

val pp : Format.formatter -> period -> unit

val to_seconds : period -> int64

(** [of_second period] fails if period is not positive *)
val of_seconds : int64 -> period tzresult

(** [of_second period] fails if period is not positive.
    It should only be used at toplevel for constants. *)
val of_seconds_exn : int64 -> period

val add : period -> period -> period tzresult

val ( +? ) : period -> period -> period tzresult

val mult : int32 -> period -> period tzresult

val zero : period

val one_second : period

val one_minute : period

val one_hour : period

(** [compare x y] returns [0] if [x] is equal to [y], a negative
    integer if [x] is shorter than [y], and a positive integer if [x]
    is longer than [y]. *)
val compare : period -> period -> int