Haskell Hierarchical Libraries (base package) Contents Index

Data.Unique Portability non-portable Stability experimental Maintainer libraries@haskell.org

Contents Unique objects

Description

An abstract interface to a unique symbol generator.

Synopsis

data Unique newUnique :: IO Unique hashUnique :: Unique -> Int

Unique objects

data Unique

An abstract unique object. Objects of type Unique may be compared for equality and ordering and hashed into Int. Instances Eq Unique Ord Unique

newUnique :: IO Unique

Creates a new object of type Unique. The value returned will not compare equal to any other value of type Unique returned by previous calls to newUnique. There is no limit on the number of times newUnique may be called.

hashUnique :: Unique -> Int

Hashes a Unique into an Int. Two Uniques may hash to the same value, although in practice this is unlikely. The Int returned makes a good hash key.

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