26 lines
645 B
Text
26 lines
645 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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Authors: Leonardo de Moura
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-/
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prelude
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import Init.Data.UInt
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import Init.Data.String
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universes u
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class Hashable (α : Type u) :=
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(hash : α → USize)
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export Hashable (hash)
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@[extern "lean_usize_mix_hash"]
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constant mixHash (u₁ u₂ : USize) : USize := default _
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@[extern "lean_string_hash"]
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protected constant String.hash (s : String) : USize := default _
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instance : Hashable String := ⟨String.hash⟩
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protected def Nat.hash (n : Nat) : USize :=
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USize.ofNat n
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instance : Hashable Nat := ⟨Nat.hash⟩
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