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src/Snap/Internal/Types.hs | 9 +++++++++
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- Log -----------------------------------------------------------------
commit 4e5e8eb4cb744dc48b7888bcd8609e30b76688e3
Author: Gregory Collins <[email protected]>
Date: Tue Jul 6 19:39:50 2010 -0400
Add a little preamble documentation for MonadSnap
diff --git a/src/Snap/Internal/Types.hs b/src/Snap/Internal/Types.hs
index 63add4f..10a7a71 100644
--- a/src/Snap/Internal/Types.hs
+++ b/src/Snap/Internal/Types.hs
@@ -92,6 +92,15 @@ import Snap.Iteratee hiding
(Enumerator)
> a :: Snap ()
> a = liftIO fireTheMissiles
+
+You may notice that most of the type signatures in this module contain a
+@(MonadSnap m) => ...@ typeclass constraint. 'MonadSnap' is a typeclass which,
+in essence, says \"you can get back to the 'Snap' monad from here\". Using
+'MonadSnap' you can extend the 'Snap' monad with additional functionality and
+still have access to most of the 'Snap' functions without writing 'lift'
+everywhere. Instances are already provided for most of the common monad
+transformers ('ReaderT', 'WriterT', 'StateT', etc.).
+
-}
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