28 lines
809 B
Text
28 lines
809 B
Text
/-
|
|
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
Author: Leonardo de Moura
|
|
-/
|
|
prelude
|
|
import init.monad init.alternative
|
|
open list
|
|
universe variables u v
|
|
attribute [inline]
|
|
definition list_fmap {A : Type u} {B : Type v} (f : A → B) (l : list A) : list B :=
|
|
map f l
|
|
|
|
attribute [inline]
|
|
definition list_bind {A : Type u} {B : Type v} (a : list A) (b : A → list B) : list B :=
|
|
join (map b a)
|
|
|
|
attribute [inline]
|
|
definition list_return {A : Type u} (a : A) : list A :=
|
|
[a]
|
|
|
|
attribute [instance]
|
|
definition list_is_monad : monad list :=
|
|
monad.mk @list_fmap @list_return @list_bind
|
|
|
|
attribute [instance]
|
|
definition list_is_alternative : alternative list :=
|
|
alternative.mk @list_fmap @list_return (@fapp _ _) @nil @list.append
|