# Module Sig_pack.S.Mark

    module Mark: sig .. end

Vertices contains integers marks, which can be set or used by some algorithms (see for instance module `Marking` below)

    type graph = Sig_pack.S.t

    type vertex = Sig_pack.S.V.t

    val clear : Sig_pack.S.t -> unit

`clear g` sets all marks to 0 from all the vertives of `g`.

    val get : Sig_pack.S.V.t -> int

    val set : Sig_pack.S.V.t -> int -> unit