60 lines
1.4 KiB
Text
60 lines
1.4 KiB
Text
/-
|
||
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
|
||
Released under Apache 2.0 license as described in the file LICENSE.
|
||
Authors: Leonardo de Moura
|
||
-/
|
||
prelude
|
||
import Init.Data.UInt.Basic
|
||
import Init.Data.String
|
||
universe u
|
||
|
||
instance : Hashable Nat where
|
||
hash n := UInt64.ofNat n
|
||
|
||
instance : Hashable String.Pos where
|
||
hash p := UInt64.ofNat p.byteIdx
|
||
|
||
instance [Hashable α] [Hashable β] : Hashable (α × β) where
|
||
hash | (a, b) => mixHash (hash a) (hash b)
|
||
|
||
instance : Hashable Bool where
|
||
hash
|
||
| true => 11
|
||
| false => 13
|
||
|
||
instance [Hashable α] : Hashable (Option α) where
|
||
hash
|
||
| none => 11
|
||
| some a => mixHash (hash a) 13
|
||
|
||
instance [Hashable α] : Hashable (List α) where
|
||
hash as := as.foldl (fun r a => mixHash r (hash a)) 7
|
||
|
||
instance [Hashable α] : Hashable (Array α) where
|
||
hash as := as.foldl (fun r a => mixHash r (hash a)) 7
|
||
|
||
instance : Hashable UInt8 where
|
||
hash n := n.toUInt64
|
||
|
||
instance : Hashable UInt16 where
|
||
hash n := n.toUInt64
|
||
|
||
instance : Hashable UInt32 where
|
||
hash n := n.toUInt64
|
||
|
||
instance : Hashable UInt64 where
|
||
hash n := n
|
||
|
||
instance : Hashable USize where
|
||
hash n := n.toUInt64
|
||
|
||
instance : Hashable (Fin n) where
|
||
hash v := v.val.toUInt64
|
||
|
||
instance : Hashable Int where
|
||
hash
|
||
| Int.ofNat n => UInt64.ofNat (2 * n)
|
||
| Int.negSucc n => UInt64.ofNat (2 * n + 1)
|
||
|
||
instance (P : Prop) : Hashable P where
|
||
hash _ := 0
|