module Abstract1:sig..end
val is_polkagrid : 'a Apron.Abstract1.t -> booltrue iff the argument manager is a polkagrid valueval of_polkagrid : 'a PolkaGrid.t Apron.Abstract1.t -> 'b Apron.Abstract1.tval to_polkagrid : 'a Apron.Abstract1.t -> 'b PolkaGrid.t Apron.Abstract1.tFailure if the argument manager is not a polkagrid manager