package core

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package core
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Option.t is like t option, except that the value is immediate. This module should mainly be used to avoid allocations.

type value := t
type t = private Span.Option.t
include Ppx_compare_lib.Comparable.S with type t := t
include Bin_prot.Binable.S with type t := t
val bin_size_t : t Bin_prot__.Size.sizer
val bin_write_t : t Bin_prot__.Write.writer
val bin_read_t : t Bin_prot__.Read.reader
val __bin_read_t__ : (int -> t) Bin_prot__.Read.reader
val bin_shape_t : Bin_prot__.Shape.t
val bin_writer_t : t Bin_prot__.Type_class.writer
val bin_reader_t : t Bin_prot__.Type_class.reader
val bin_t : t Bin_prot__.Type_class.t
include Immediate_option.S_int63 with type value := value with type t := t
include Immediate_option_intf.S_without_immediate with type t := t with type value := value
include Ppx_compare_lib.Comparable.S with type t := t
include Ppx_hash_lib.Hashable.S with type t := t
val hash_fold_t : t Base__Ppx_hash_lib.hash_fold
val hash : t -> Base__Ppx_hash_lib.Std.Hash.hash_value
include Typerep_lib.Typerepable.S with type t := t
val typerep_of_t : t Typerep_lib.Std_internal.Typerep.t
val typename_of_t : t Typerep_lib.Typename.t
include Immediate_option_intf.S_without_immediate_plain with type t := t with 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 : Optional_syntax.S with type t := t with type value := value
include Quickcheck.S with type t := t
val quickcheck_generator : t Base_quickcheck.Generator.t
val quickcheck_observer : t Base_quickcheck.Observer.t
val quickcheck_shrinker : t Base_quickcheck.Shrinker.t
module Stable : sig ... end
val sexp_of_t : [ `Use_Time_ns_unix ]
  • deprecated [since 2023-09] Use [Time_ns_unix.Option]
val (>=) : t -> t -> bool
val (<=) : t -> t -> bool
val (=) : t -> t -> bool
val (>) : t -> t -> bool
val (<) : t -> t -> bool
val (<>) : t -> t -> bool
val equal : t -> t -> bool
val compare : t -> t -> int
val min : t -> t -> t
val max : t -> t -> t
module Alternate_sexp : sig ... end

Just like Time_ns.Alternate_sexp, this is different from the sexp format exposed in Time_ns_unix. See the comment above.

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