package containers

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Basic Functions

val (|>) : 'a -> ('a -> 'b) -> 'b

A 'pipe' operator. x |> f is the same as f x.

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

Composition. compose f g x is g (f x).

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

compose_binop f g is fun x y -> g (f x) (f y). Example (partial order): List.sort (compose_binop fst CCInt.compare) [1, true; 2, false; 1, false].

  • since 0.6
val (%>) : ('a -> 'b) -> ('b -> 'c) -> 'a -> 'c

Alias to compose.

val (@@) : ('a -> 'b) -> 'a -> 'b

f @@ x is the same as f x, but right-associative.

  • since 0.5
val id : 'a -> 'a

Identity function.

val const : 'a -> 'b -> 'a

Produce a function that just returns its first argument. const x y = x for any y.

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

Reverse the order of arguments for a binary function.

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

Convert a function which accepts a pair of arguments into a function which accepts two arguments. curry f x y is f (x,y).

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

Convert a function which accepts a two arguments into a function which accepts a pair of arguments. uncurry f (x,y) is f x y.

val tap : ('a -> _) -> 'a -> 'a

tap f x evaluates f x, discards it, then returns x. Useful in a pipeline, for instance:

CCArray.(1 -- 10)
|> tap CCArray.shuffle
|> tap @@ CCArray.sort Pervasives.compare
val (%) : ('b -> 'c) -> ('a -> 'b) -> 'a -> 'c

Mathematical composition. (%) f g x is f (g x).

val lexicographic : ('a -> 'a -> int) -> ('a -> 'a -> int) -> 'a -> 'a -> int

Lexicographic combination of comparison functions.

val finally : h:(unit -> _) -> f:(unit -> 'a) -> 'a

finally h f calls f () and returns its result. If it raises, the same exception is raised; in any case, h () is called after f () terminates.

val finally1 : h:(unit -> _) -> ('a -> 'b) -> 'a -> 'b

finally1 ~h f x is the same as f x, but after the computation, h () is called whether f x rose an exception or not.

  • since 0.16
val finally2 : h:(unit -> _) -> ('a -> 'b -> 'c) -> 'a -> 'b -> 'c

finally2 ~h f x y is the same as f x y, but after the computation, h () is called whether f x y rose an exception or not.

  • since 0.16
val opaque_identity : 'a -> 'a

opaque_identity x is like x, but prevents Flambda from using x's definition for optimizing it. (flambda is an optimization/inlining pass in OCaml >= 4.03).

  • since 0.18
val iterate : int -> ('a -> 'a) -> 'a -> 'a

iterate n f is f iterated n times. That is to say, iterate 0 f x is x, iterate 1 f x is f x, iterate 2 f x is f (f x), etc.

  • since 2.1

Monad

Functions with a fixed domain are monads in their codomain.

module Monad (X : sig ... end) : sig ... end
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