Module type Piecewise_linear.S_invertible

module type S_invertible = Piecewise_linear_intf.S_invertible

include Piecewise_linear_intf.S

create enforces that the x (key) values are strictly increasing. It also enforces that the y (value) values are either strictly increasing or strictly decreasing. These two properties give us invertibility.

val get_inverse : t -> value -> key

get_inverse t value is the inverse operation of get t key.