From 768c259495200ff3214dd4eb1284aaa49a7a814c Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@mapbox.com>
Date: Fri, 8 May 2015 15:19:41 -0700
Subject: fix division by zero conditions

---
 include/mbgl/util/math.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/mbgl/util/math.hpp b/include/mbgl/util/math.hpp
index 6dea628e93..5fcf3dce80 100644
--- a/include/mbgl/util/math.hpp
+++ b/include/mbgl/util/math.hpp
@@ -100,7 +100,11 @@ inline T mag(const S& a) {
 
 template <typename S>
 inline S unit(const S& a) {
-    return a * (1 / mag(a));
+    auto magnitude = mag(a);
+    if (magnitude == 0) {
+        return a;
+    }
+    return a * (1 / magnitude);
 }
 
 template <typename T>
-- 
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