package async_kernel

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package async_kernel
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type value = t
type t
val sexp_of_t : t -> Ppx_sexp_conv_lib.Sexp.t
include Core_kernel.Immediate_option.S_without_immediate_plain with type t := t and type value := value

Constructors analogous to None and Some. If not (some_is_representable x) then some x may raise or return none.

val none : t
val some : value -> t
val some_is_representable : value -> Base.Bool.t

For some representations of immediate options, the encodings of none and some overlap. For these representations, some_is_representable value = false if value cannot be represented as an option. For example, Int.Option uses min_value to represent none. For other representations, some_is_representable always returns true.

val is_none : t -> Base.Bool.t
val is_some : t -> Base.Bool.t
val value : t -> default:value -> value

value (some x) ~default = x and value none ~default = default.

val value_exn : t -> value

value_exn (some x) = x. value_exn none raises. Unlike Option.value_exn, there is no ?message argument, so that calls to value_exn that do not raise also do not have to allocate.

val unchecked_value : t -> value

unchecked_value (some x) = x. unchecked_value none returns an unspecified value. unchecked_value t is intended as an optimization of value_exn t when is_some t is known to be true.

val to_option : t -> value Base.Option.t
val of_option : value Base.Option.t -> t
module Optional_syntax : Core_kernel.Optional_syntax.S with type t := t with type value := value