From 56e68abc1d03f1991f45365b4adc5b0bc4f05996 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Mon, 24 Oct 2011 23:53:27 -0400
Subject: [PATCH] Add bang patterns for the cube_at function (Ben Lippmeier).

---
 src/Grid.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Grid.hs b/src/Grid.hs
index ca66437..71e39a0 100644
--- a/src/Grid.hs
+++ b/src/Grid.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns #-}
 -- | The Grid module just contains the Grid type and two constructors
 --   for it. We hide the main Grid constructor because we don't want
 --   to allow instantiation of a grid with h <= 0.
@@ -65,7 +66,7 @@ make_grid grid_size values
 --   centered on that position. If there is no cube there (i.e. the
 --   position is outside of the grid), it will throw an error.
 cube_at :: Grid -> Int -> Int -> Int -> Cube
-cube_at g i j k
+cube_at !g !i !j !k
     | i < 0      = error "i < 0 in cube_at"
     | i >= xsize = error "i >= xsize in cube_at"
     | j < 0      = error "j < 0 in cube_at"
-- 
2.43.2