module type RefOps =sig..end
x -= y is
the same as x := !x - y.type bat__refops_t
val (+=) : bat__refops_t Pervasives.ref ->
bat__refops_t -> unitval (-=) : bat__refops_t Pervasives.ref ->
bat__refops_t -> unitval ( *= ) : bat__refops_t Pervasives.ref ->
bat__refops_t -> unitval (/=) : bat__refops_t Pervasives.ref ->
bat__refops_t -> unit