From 5973e31fd84d4a91578185f649b3783fdae8a882 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Tue, 7 Jun 2011 17:00:54 -0400
Subject: [PATCH] Add the all_equal function to the Misc module.

---
 src/Misc.hs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/Misc.hs b/src/Misc.hs
index 6364e95..fd6dd39 100644
--- a/src/Misc.hs
+++ b/src/Misc.hs
@@ -18,3 +18,13 @@ factorial n
 --   one-dimensional one.
 flatten :: [[[a]]] -> [a]
 flatten xs = concat $ concat xs
+
+
+-- | Takes a list, and returns True if its elements are pairwise
+--   equal. Returns False otherwise.
+all_equal :: (Eq a) => [a] -> Bool
+all_equal xs =
+    and $ map (== first_element) other_elements
+    where
+      first_element  = head xs
+      other_elements = tail xs
-- 
2.43.2