package core

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package core
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Module Core.Set_onceSource

A 'a Set_once.t is like an 'a option ref that can only be set once. A Set_once.t starts out as None, the first set transitions it to Some, and subsequent sets fail.

Sourcetype 'a t
Sourceval sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.t

Passes when unset.

include Base.Invariant.S1 with type 'a t := 'a t
Sourceval invariant : ('a -> unit) -> 'a t -> unit
Sourceval create : Base.Unit.t -> _ t
Sourceval set_exn : 'a t -> Source_code_position.t -> 'a -> Base.Unit.t
Sourceval set_if_none : 'a t -> Source_code_position.t -> 'a -> Base.Unit.t

set_if_none t here a will do nothing if is_some t, otherwise it will set_exn t here a.

Sourceval get : 'a t -> 'a Base.Option.t
Sourceval get_exn : 'a t -> Source_code_position.t -> 'a
Sourceval is_none : _ t -> Base.Bool.t
Sourceval is_some : _ t -> Base.Bool.t
Sourceval iter : 'a t -> f:('a -> Base.Unit.t) -> Base.Unit.t
Sourcemodule Optional_syntax : Optional_syntax.S1 with type 'a t := 'a t with type 'a value := 'a
Sourcemodule Unstable : sig ... end
Sourcemodule Stable : sig ... end
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