Module type Period.S

module type S = sig .. end

Common interface for all periods.

type +[< Period.date_field ] period

type t = Period.date_field period

Type of a period.

val empty : [< Period.date_field ] period

The empty period.

val add : ([< Period.date_field ] as 'a) period ->
       'a period -> 'a period

Addition of periods.

val sub : ([< Period.date_field ] as 'a) period ->
       'a period -> 'a period

Substraction of periods.

val opp : ([< Period.date_field ] as 'a) period -> 'a period

Opposite of a period.

val equal : [< Period.date_field ] period ->
       [< Period.date_field ] period -> bool

Equality function between two periods.
Since 1.09.0
See also Utils.Comparable.equal

val compare : [< Period.date_field ] period ->
       [< Period.date_field ] period -> int

Comparison function between two periods.
See also Utils.Comparable.compare

val hash : [< Period.date_field ] period -> int

Hash function for periods.
Since 2.0
See also Utils.Comparable.hash