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`