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Add a convenience function withEnv #54

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Add a convenience function withEnv #54

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6 changes: 5 additions & 1 deletion Control/Monad/Reader/Class.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ than using the 'Control.Monad.State.State' monad.

module Control.Monad.Reader.Class (
MonadReader(..),
asks,
asks, withEnv
) where

import Control.Monad.Trans.Cont as Cont
Expand Down Expand Up @@ -98,6 +98,10 @@ asks :: MonadReader r m
-> m a
asks = reader

-- | Executes a computation in a predefined environment.
withEnv :: MonadReader r m => r -> m a -> m a
withEnv env = local (const env)

-- ----------------------------------------------------------------------------
-- The partially applied function type is a simple reader monad

Expand Down