From d0261bd26c3900a5e52da3574fc2aeab3392c30b Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sat, 30 Nov 2013 10:42:23 +0100
Subject: [PATCH] Fix swap in DenseBase

---
 Eigen/src/Core/DenseBase.h | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/Core/DenseBase.h b/Eigen/src/Core/DenseBase.h
index 4794c2f13..50a63c85c 100644
--- a/Eigen/src/Core/DenseBase.h
+++ b/Eigen/src/Core/DenseBase.h
@@ -387,7 +387,29 @@ template<typename Derived> class DenseBase
       // size types on MSVC.
       return typename internal::eval<Derived>::type(derived());
     }
+    
+#ifdef EIGEN_TEST_EVALUATORS
+    /** swaps *this with the expression \a other.
+      *
+      */
+    template<typename OtherDerived>
+    EIGEN_DEVICE_FUNC
+    void swap(const DenseBase<OtherDerived>& other,
+              int = OtherDerived::ThisConstantIsPrivateInPlainObjectBase)
+    {
+      swap_using_evaluator(derived(), other.derived());
+    }
 
+    /** swaps *this with the matrix or array \a other.
+      *
+      */
+    template<typename OtherDerived>
+    EIGEN_DEVICE_FUNC
+    void swap(PlainObjectBase<OtherDerived>& other)
+    {
+      swap_using_evaluator(derived(), other.derived());
+    }
+#else // EIGEN_TEST_EVALUATORS
     /** swaps *this with the expression \a other.
       *
       */
@@ -408,7 +430,7 @@ template<typename Derived> class DenseBase
     {
       SwapWrapper<Derived>(derived()).lazyAssign(other.derived());
     }
-
+#endif // EIGEN_TEST_EVALUATORS
 
     EIGEN_DEVICE_FUNC inline const NestByValue<Derived> nestByValue() const;
     EIGEN_DEVICE_FUNC inline const ForceAlignedAccess<Derived> forceAlignedAccess() const;