package grenier

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Basic ordering operations

type t

An element of an ordering.

val root : unit -> t

Create a new ordering with a single element. O(1)

val after : t -> t

after t inserts a new element to the ordering, greater than t but less than all existing elements greater than t.

O(1) amortized.

val before : t -> t

before t inserts a new element to the ordering, less than t but greater than all existing elements less than t.

O(1) amortized.

val same_order : t -> t -> bool

Check if two elements belong to the same order. O(1)

val compare : t -> t -> int

Compare two elements. O(1)

val cardinal : t -> int

How many elements are ordered. O(1)

val forget : t -> unit

Memory of every element is retained. When you know you are not going to use an element any longer, forget it to release memory. O(1).

val is_valid : t -> bool

After calling forget, an element should not be used. You can check if it is the case with is_valid.

val unsafe_next : t -> t

val unsafe_prev : t -> t

val unsafe_check : t -> string -> unit