From f75e6773b0d3dc4838acc04993dd2cd9a3422878 Mon Sep 17 00:00:00 2001
From: Hauke Heibel <hauke.heibel@gmail.com>
Date: Sun, 21 Feb 2010 15:24:10 +0100
Subject: [PATCH] Added ei_traits<Quaternion>::PlainObject.

---
 Eigen/src/Geometry/Quaternion.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Eigen/src/Geometry/Quaternion.h b/Eigen/src/Geometry/Quaternion.h
index 67319d15b..e0dfadd7c 100644
--- a/Eigen/src/Geometry/Quaternion.h
+++ b/Eigen/src/Geometry/Quaternion.h
@@ -211,6 +211,7 @@ public:
 template<typename _Scalar>
 struct ei_traits<Quaternion<_Scalar> >
 {
+  typedef Quaternion<_Scalar> PlainObject;
   typedef _Scalar Scalar;
   typedef Matrix<_Scalar,4,1> Coefficients;
   enum{