vault-0.3.1.5: a persistent store for values of arbitrary types
Safe Haskell None
Language Haskell2010

Data.Vault.ST.Strict

Description

A persistent store for values of arbitrary types. Variant for the ST monad.

The Vault type in this module is strict in both keys and values.

Synopsis

Vault

empty :: Vault s Source #

The empty vault.

newKey :: ST s ( Key s a) Source #

Create a new key for use with a vault.

lookup :: Key s a -> Vault s -> Maybe a Source #

Lookup the value of a key in the vault.

insert :: Key s a -> a -> Vault s -> Vault s Source #

Insert a value for a given key. Overwrites any previous value.

adjust :: (a -> a) -> Key s a -> Vault s -> Vault s Source #

Adjust the value for a given key if it's present in the vault.

delete :: Key s a -> Vault s -> Vault s Source #

Delete a key from the vault.

union :: Vault s -> Vault s -> Vault s Source #

Merge two vaults (left-biased).

Locker

lock :: Key s a -> a -> Locker s Source #

Put a single value into a Locker .

unlock :: Key s a -> Locker s -> Maybe a Source #

Retrieve the value from the Locker .