package preface

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package preface
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type ('a, 'b) t = ('a, 'b) Either.t =
  1. | Left of 'a
  2. | Right of 'b

This module defines the common Either interface that is provided for all OCaml versions. For documentation of these functions, refer to the standard library.

val left : 'a -> ('a, 'b) t
val right : 'b -> ('a, 'b) t
val is_left : ('a, 'b) t -> bool
val is_right : ('a, 'b) t -> bool
val find_left : ('a, 'b) t -> 'a option
val find_right : ('a, 'b) t -> 'b option
val map_left : ('a1 -> 'a2) -> ('a1, 'b) t -> ('a2, 'b) t
val map_right : ('b1 -> 'b2) -> ('a, 'b1) t -> ('a, 'b2) t
val map : left:('a1 -> 'a2) -> right:('b1 -> 'b2) -> ('a1, 'b1) t -> ('a2, 'b2) t
val fold : left:('a -> 'c) -> right:('b -> 'c) -> ('a, 'b) t -> 'c
val iter : left:('a -> unit) -> right:('b -> unit) -> ('a, 'b) t -> unit
val for_all : left:('a -> bool) -> right:('b -> bool) -> ('a, 'b) t -> bool
val equal : left:('a -> 'a -> bool) -> right:('b -> 'b -> bool) -> ('a, 'b) t -> ('a, 'b) t -> bool
val compare : left:('a -> 'a -> int) -> right:('b -> 'b -> int) -> ('a, 'b) t -> ('a, 'b) t -> int
val case : ('a -> 'c) -> ('b -> 'c) -> ('a, 'b) t -> 'c

case f g x conditionally perform f or g on x.

val swap : ('a, 'b) t -> ('b, 'a) t

swap x transforms Left x into Right x and Right x into Left x

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