From 0d7039319c2826f5550d2fc5ca5421091d6ed8a9 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 27 Jul 2016 14:35:52 +0200
Subject: [PATCH] bug #1260: remove doubtful specializations of
 ScalarBinaryOpTraits

---
 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h | 16 ----------------
 unsupported/test/autodiff.cpp                   |  4 ++++
 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
index a4d12ab37..98e0e3b73 100755
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
@@ -497,31 +497,15 @@ struct make_coherent_impl<Matrix<A_Scalar, A_Rows, A_Cols, A_Options, A_MaxRows,
 
 } // end namespace internal
 
-template<typename A_Scalar, int A_Rows, int A_Cols, int A_Options, int A_MaxRows, int A_MaxCols, typename BinOp>
-struct ScalarBinaryOpTraits<Matrix<A_Scalar, A_Rows, A_Cols, A_Options, A_MaxRows, A_MaxCols>,A_Scalar,BinOp>
-{
-  enum { Defined = 1 };
-  typedef Matrix<A_Scalar, A_Rows, A_Cols, A_Options, A_MaxRows, A_MaxCols> ReturnType;
-};
-
-template<typename A_Scalar, int A_Rows, int A_Cols, int A_Options, int A_MaxRows, int A_MaxCols, typename BinOp>
-struct ScalarBinaryOpTraits<A_Scalar, Matrix<A_Scalar, A_Rows, A_Cols, A_Options, A_MaxRows, A_MaxCols>, BinOp>
-{
-  enum { Defined = 1 };
-  typedef Matrix<A_Scalar, A_Rows, A_Cols, A_Options, A_MaxRows, A_MaxCols> ReturnType;
-};
-
 template<typename DerType, typename BinOp>
 struct ScalarBinaryOpTraits<AutoDiffScalar<DerType>,typename DerType::Scalar,BinOp>
 {
-  enum { Defined = 1 };
   typedef AutoDiffScalar<DerType> ReturnType;
 };
 
 template<typename DerType, typename BinOp>
 struct ScalarBinaryOpTraits<typename DerType::Scalar,AutoDiffScalar<DerType>, BinOp>
 {
-  enum { Defined = 1 };
   typedef AutoDiffScalar<DerType> ReturnType;
 };
 
diff --git a/unsupported/test/autodiff.cpp b/unsupported/test/autodiff.cpp
index b59fd1c43..e422ba8bc 100644
--- a/unsupported/test/autodiff.cpp
+++ b/unsupported/test/autodiff.cpp
@@ -205,6 +205,10 @@ void test_autodiff_hessian()
   VERIFY_IS_APPROX(y.value().derivatives()(1), s4*std::cos(s1*s3+s2*s4));
   VERIFY_IS_APPROX(y.derivatives()(0).derivatives(), -std::sin(s1*s3+s2*s4)*Vector2d(s3*s3,s4*s3));
   VERIFY_IS_APPROX(y.derivatives()(1).derivatives(),  -std::sin(s1*s3+s2*s4)*Vector2d(s3*s4,s4*s4));
+
+  ADD z = x(0)*x(1);
+  VERIFY_IS_APPROX(z.derivatives()(0).derivatives(), Vector2d(0,1));
+  VERIFY_IS_APPROX(z.derivatives()(1).derivatives(), Vector2d(1,0));
 }
 
 double bug_1222() {