module Piecewise_linear: Piecewise_linear
module type Key =sig
..end
module type S =sig
..end
module Make:
module Time:S
with type key = Time.t
module Ofday:S
with type key = Ofday.t
module Span:S
with type key = Span.t
module Float:S
with type key = float
module Int:S
with type key = int