15 lines
464 B
Text
15 lines
464 B
Text
/-
|
|
Copyright (c) Luke Nelson and Jared Roesch. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
Authors: Luke Nelson and Jared Roesch
|
|
-/
|
|
prelude
|
|
universe variables u v
|
|
|
|
class functor (f : Type u → Type v) : Type (max u+1 v) :=
|
|
(map : Π {a b : Type u}, (a → b) → f a → f b)
|
|
|
|
@[inline] def fmap {f : Type u → Type v} [functor f] {a b : Type u} : (a → b) → f a → f b :=
|
|
functor.map
|
|
|
|
infixr ` <$> `:100 := fmap
|