22 lines
556 B
Text
22 lines
556 B
Text
/-
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Copyright (c) 2016 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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-/
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prelude
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import init.monad init.alternative
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open list
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universe variables u v
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@[inline] def list.bind {A : Type u} {B : Type v} (a : list A) (b : A → list B) : list B :=
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join (map b a)
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@[inline] def list.ret {A : Type u} (a : A) : list A :=
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[a]
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instance : monad list :=
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⟨@map, @list.ret, @list.bind⟩
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instance : alternative list :=
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⟨@map, @list.ret, @fapp _ _, @nil, @list.append⟩
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