39 lines
1.7 KiB
OCaml
39 lines
1.7 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2018. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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(** [Some (f x)] if input is [Some x], or [None] if it's [None] **)
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val map: f:('a -> 'b) -> 'a option -> 'b option
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(** [(f x)] if input is [Some x], or [None] if it's [None] **)
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val apply: f:('a -> 'b option) -> 'a option -> 'b option
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val (>>=) : 'a option -> ('a -> 'b option) -> 'b option
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val (>>|) : 'a option -> ('a -> 'b) -> 'b option
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(** Call [(f x)] if input is [Some x], noop if it's [None] **)
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val iter: f:('a -> unit) -> 'a option -> unit
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(** [x] if input is [Some x], default if it's [None] **)
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val unopt: default:'a -> 'a option -> 'a
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(** [unopt_map f d x] is [y] if [x] is [Some y], [d] if [x] is [None] **)
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val unopt_map: f:('a -> 'b) -> default:'b -> 'a option -> 'b
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(** [unopt_exn exn x] is [y] if [x] is [Some y], or raises [exn] if [x] is [None] *)
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val unopt_exn : exn -> 'a option -> 'a
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(** First input of form [Some x], or [None] if none **)
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val first_some: 'a option -> 'a option -> 'a option
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(** [Some (f ())] if [f] does not raise, [None] otherwise *)
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val try_with : (unit -> 'a) -> 'a option
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(** Make an option of a value *)
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val some : 'a -> 'a option
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