From: PHO <pho@cielonegro.org>
Date: Mon, 14 Nov 2011 05:55:49 +0000 (+0900)
Subject: () should be an instance of Dispatchable.
X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=commitdiff_plain;h=6cc54cc;p=Lucu.git

() should be an instance of Dispatchable.

Ditz-issue: e0312227f40a0fa92d4c5d69a64dad473f54389a
---

diff --git a/Network/HTTP/Lucu/Resource/Dispatcher.hs b/Network/HTTP/Lucu/Resource/Dispatcher.hs
index ac3112f..13080ee 100644
--- a/Network/HTTP/Lucu/Resource/Dispatcher.hs
+++ b/Network/HTTP/Lucu/Resource/Dispatcher.hs
@@ -38,7 +38,7 @@ instance Dispatchable Dispatcher where
 -- |FIXME: doc
 instance Monoid Dispatcher where
     {-# INLINE mempty #-}
-    mempty = dispatcher (return Nothing ∷ IO (Maybe ResourceDef))
+    mempty = dispatcher ()
 
     {-# INLINEABLE mappend #-}
     mappend (Dispatcher α) (Dispatcher β)
@@ -68,5 +68,10 @@ instance Dispatchable ([ByteString] → Maybe ResourceDef) where
 instance Dispatchable (IO (Maybe ResourceDef)) where
     dispatch = const ∘ const ∘ ((<$>) ∘ (<$>)) ((,) [])
 
+-- |The constant dispatcher returning always the same 'ResourceDef'.
 instance Dispatchable ResourceDef where
     dispatch = const ∘ const ∘ return ∘ Just ∘ (,) []
+
+-- |The empty dispatcher returning always 'Nothing'.
+instance Dispatchable () where
+    dispatch _ _ _ = return Nothing
\ No newline at end of file