Batteries user guide : BatNumber.RefOps

# Module type BatNumber.RefOps

    module type RefOps = sig .. end

Reference operators ala C. Mutates a reference value. `x -= y` is the same as `x := !x - y`.
Since 2.0

    type bat__refops_t

    val (+=) : bat__refops_t Pervasives.ref ->
           bat__refops_t -> unit

    val (-=) : bat__refops_t Pervasives.ref ->
           bat__refops_t -> unit

    val ( *= ) : bat__refops_t Pervasives.ref ->
           bat__refops_t -> unit

    val (/=) : bat__refops_t Pervasives.ref ->
           bat__refops_t -> unit