Batteries user guide : BatOptParse.StdOpt

`sig val store_const : ?default:'a -> 'a -> 'a BatOptParse.Opt.t val store_true : unit -> bool BatOptParse.Opt.t val store_false : unit -> bool BatOptParse.Opt.t val count_option : ?dest:int Pervasives.ref -> ?increment:int -> unit -> int BatOptParse.Opt.t val incr_option : ?dest:int Pervasives.ref -> unit -> int BatOptParse.Opt.t val decr_option : ?dest:int Pervasives.ref -> unit -> int BatOptParse.Opt.t val int_option : ?default:int -> ?metavar:string -> unit -> int BatOptParse.Opt.t val float_option : ?default:float -> ?metavar:string -> unit -> float BatOptParse.Opt.t val str_option : ?default:string -> ?metavar:string -> unit -> string BatOptParse.Opt.t val any_option : ?default:'a option -> ?metavar:string -> (string -> 'a) -> 'a BatOptParse.Opt.t val int_callback : ?metavar:string -> (int -> unit) -> unit BatOptParse.Opt.t val float_callback : ?metavar:string -> (float -> unit) -> unit BatOptParse.Opt.t val str_callback : ?metavar:string -> (string -> unit) -> unit BatOptParse.Opt.t val help_option : unit -> 'a BatOptParse.Opt.t val version_option : (unit -> string) -> 'a BatOptParse.Opt.t end`