package containers

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  1. Tuple Functions
package containers
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Tuple Functions

type ('a, 'b) t = 'a * 'b
val make : 'a -> 'b -> ('a, 'b) t

Make a tuple from its components.

  • since 0.16
val map1 : ('a -> 'b) -> ('a * 'c) -> 'b * 'c

map1 f (x, y) returns (f x, y).

val map2 : ('a -> 'b) -> ('c * 'a) -> 'c * 'b

map2 f (x, y) returns (x, f y).

val map : ('a -> 'c) -> ('b -> 'd) -> ('a * 'b) -> 'c * 'd

Synonym to (***). Map on both sides of a tuple.

val map_same : ('a -> 'b) -> ('a * 'a) -> 'b * 'b

Like map but specialized for pairs with elements of the same type.

val map_fst : ('a -> 'b) -> ('a * _) -> 'b

Compose the given function with fst.

  • since 0.3.3
val map_snd : ('a -> 'b) -> (_ * 'a) -> 'b

Compose the given function with snd.

  • since 0.3.3
val iter : ('a -> 'b -> unit) -> ('a * 'b) -> unit
val swap : ('a * 'b) -> 'b * 'a

Swap the components of the tuple.

val (<<<) : ('a -> 'b) -> ('a * 'c) -> 'b * 'c

Map on the left side of the tuple.

val (>>>) : ('a -> 'b) -> ('c * 'a) -> 'c * 'b

Map on the right side of the tuple.

val (***) : ('a -> 'c) -> ('b -> 'd) -> ('a * 'b) -> 'c * 'd

Map on both sides of a tuple.

val (&&&) : ('a -> 'b) -> ('a -> 'c) -> 'a -> 'b * 'c

f &&& g is fun x -> f x, g x. It splits the computations into two parts.

val merge : ('a -> 'b -> 'c) -> ('a * 'b) -> 'c

Uncurrying (merges the two components of a tuple).

val fold : ('a -> 'b -> 'c) -> ('a * 'b) -> 'c

Synonym to merge.

  • since 0.3.3
val dup : 'a -> 'a * 'a

dup x = (x,x) (duplicate the value).

  • since 0.3.3
val dup_map : ('a -> 'b) -> 'a -> 'a * 'b

dup_map f x = (x, f x). Duplicates the value and applies the function to the second copy.

  • since 0.3.3
val equal : ('a -> 'a -> bool) -> ('b -> 'b -> bool) -> ('a * 'b) -> ('a * 'b) -> bool
val compare : ('a -> 'a -> int) -> ('b -> 'b -> int) -> ('a * 'b) -> ('a * 'b) -> int
val to_string : ?sep:string -> ('a -> string) -> ('b -> string) -> ('a * 'b) -> string

Print tuple in a string

  • since 2.7
type 'a printer = Format.formatter -> 'a -> unit
val pp : ?sep:string -> 'a printer -> 'b printer -> ('a * 'b) printer

Print a pair given an optional separator and a method for printing each of its elements.

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