Module type `Period.S`

Common interface for all periods.

type +'a period constraint 'a = [< date_field ]
type t = date_field period: Type of a period.

Period is an additive monoid

val empty : 'a period: The empty period.

val add : 'a period -> 'a period -> 'a period: Addition of periods.

val sub : 'a period -> 'a period -> 'a period: Substraction of periods.

val opp : 'a period -> 'a period: Opposite of a period.

Periods are comparable

val equal : 'a period -> 'b period -> bool

Equality function between two periods.

see Utils.Comparable.html#VALequal: Utils.Comparable.equal

since: 1.09.0

val compare : 'a period -> 'b period -> int

Comparison function between two periods.

see Utils.Comparable.html#VALcompare: Utils.Comparable.compare

val hash : 'a period -> int

Hash function for periods.

see Utils.Comparable.html#VALhash: Utils.Comparable.hash

since: 2.0