From 43790e009b556b2b8db2726d12653d9f64a8086d Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 18 May 2016 16:28:02 +0200
Subject: [PATCH] Pass argument by const ref instead of by value in
 pow(AutoDiffScalar...)

---
 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
index 0e911cd53..089042751 100755
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
@@ -602,7 +602,7 @@ EIGEN_AUTODIFF_DECLARE_GLOBAL_UNARY(log,
 
 template<typename DerType>
 inline const Eigen::AutoDiffScalar<Eigen::CwiseUnaryOp<Eigen::internal::scalar_multiple_op<typename internal::traits<typename internal::remove_all<DerType>::type>::Scalar>, const typename internal::remove_all<DerType>::type> >
-pow(const Eigen::AutoDiffScalar<DerType>& x, typename internal::traits<typename internal::remove_all<DerType>::type>::Scalar y)
+pow(const Eigen::AutoDiffScalar<DerType>& x, const typename internal::traits<typename internal::remove_all<DerType>::type>::Scalar &y)
 {
   using namespace Eigen;
   typedef typename internal::remove_all<DerType>::type DerTypeCleaned;