package calendar

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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.

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.

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

Equality function between two periods.

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

Comparison function between two periods.

val hash : 'a period -> int

Hash function for periods.