From e3e34b5920c9d522e53e4800218b53633df71f86 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Fri, 23 Apr 2010 12:16:30 -0400
Subject: [PATCH] remove MakeBase, use ei_dense_xpr_base instead (yes, it was
 only used in dense xprs anyway)

---
 Eigen/src/Array/ArrayBase.h         |  2 --
 Eigen/src/Array/Replicate.h         |  5 +++--
 Eigen/src/Array/Reverse.h           |  5 +++--
 Eigen/src/Array/Select.h            |  5 +++--
 Eigen/src/Array/VectorwiseOp.h      |  5 +++--
 Eigen/src/Core/Block.h              |  2 +-
 Eigen/src/Core/CwiseBinaryOp.h      |  4 ++--
 Eigen/src/Core/CwiseNullaryOp.h     |  4 ++--
 Eigen/src/Core/CwiseUnaryOp.h       |  4 ++--
 Eigen/src/Core/CwiseUnaryView.h     |  4 ++--
 Eigen/src/Core/DenseBase.h          | 18 ------------------
 Eigen/src/Core/Diagonal.h           |  4 ++--
 Eigen/src/Core/ForceAlignedAccess.h |  4 ++--
 Eigen/src/Core/MatrixBase.h         |  2 --
 Eigen/src/Core/NestByValue.h        |  4 ++--
 Eigen/src/Core/ReturnByValue.h      |  6 +++---
 Eigen/src/Core/SelfCwiseBinaryOp.h  |  4 ++--
 Eigen/src/Core/Swap.h               |  4 ++--
 Eigen/src/Core/util/XprHelper.h     | 18 ++++++++++++++++++
 19 files changed, 52 insertions(+), 52 deletions(-)

diff --git a/Eigen/src/Array/ArrayBase.h b/Eigen/src/Array/ArrayBase.h
index c961911bb..c507b7694 100644
--- a/Eigen/src/Array/ArrayBase.h
+++ b/Eigen/src/Array/ArrayBase.h
@@ -54,8 +54,6 @@ template<typename Derived> class ArrayBase
 #ifndef EIGEN_PARSED_BY_DOXYGEN
     /** The base class for a given storage type. */
     typedef ArrayBase StorageBaseType;
-    /** Construct the base class type for the derived class OtherDerived */
-    template <typename OtherDerived> struct MakeBase { typedef ArrayBase<OtherDerived> Type; };
 
     using ei_special_scalar_op_base<Derived,typename ei_traits<Derived>::Scalar,
                 typename NumTraits<typename ei_traits<Derived>::Scalar>::Real>::operator*;
diff --git a/Eigen/src/Array/Replicate.h b/Eigen/src/Array/Replicate.h
index e75bfd3a9..63e4683b7 100644
--- a/Eigen/src/Array/Replicate.h
+++ b/Eigen/src/Array/Replicate.h
@@ -44,6 +44,7 @@ struct ei_traits<Replicate<MatrixType,RowFactor,ColFactor> >
 {
   typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_traits<MatrixType>::StorageKind StorageKind;
+  typedef typename ei_traits<MatrixType>::XprKind XprKind;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
   enum {
@@ -65,11 +66,11 @@ struct ei_traits<Replicate<MatrixType,RowFactor,ColFactor> >
 };
 
 template<typename MatrixType,int RowFactor,int ColFactor> class Replicate
-  : public MatrixType::template MakeBase< Replicate<MatrixType,RowFactor,ColFactor> >::Type
+  : public ei_dense_xpr_base< Replicate<MatrixType,RowFactor,ColFactor> >::type
 {
   public:
 
-    typedef typename MatrixType::template MakeBase< Replicate<MatrixType,RowFactor,ColFactor> >::Type Base;
+    typedef typename ei_dense_xpr_base<Replicate>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Replicate)
 
     template<typename OriginalMatrixType>
diff --git a/Eigen/src/Array/Reverse.h b/Eigen/src/Array/Reverse.h
index 305774c68..0f56d5d5c 100644
--- a/Eigen/src/Array/Reverse.h
+++ b/Eigen/src/Array/Reverse.h
@@ -47,6 +47,7 @@ struct ei_traits<Reverse<MatrixType, Direction> >
 {
   typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_traits<MatrixType>::StorageKind StorageKind;
+  typedef typename ei_traits<MatrixType>::XprKind XprKind;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
   enum {
@@ -75,11 +76,11 @@ template<typename PacketScalar> struct ei_reverse_packet_cond<PacketScalar,false
 };
 
 template<typename MatrixType, int Direction> class Reverse
-  : public MatrixType::template MakeBase< Reverse<MatrixType, Direction> >::Type
+  : public ei_dense_xpr_base< Reverse<MatrixType, Direction> >::type
 {
   public:
 
-    typedef typename MatrixType::template MakeBase< Reverse<MatrixType, Direction> >::Type Base;
+    typedef typename ei_dense_xpr_base<Reverse>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Reverse)
     using Base::IsRowMajor;
 
diff --git a/Eigen/src/Array/Select.h b/Eigen/src/Array/Select.h
index 53506ae5d..100a26445 100644
--- a/Eigen/src/Array/Select.h
+++ b/Eigen/src/Array/Select.h
@@ -47,6 +47,7 @@ struct ei_traits<Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >
 {
   typedef typename ei_traits<ThenMatrixType>::Scalar Scalar;
   typedef Dense StorageKind;
+  typedef typename ei_traits<ThenMatrixType>::XprKind XprKind;
   typedef typename ConditionMatrixType::Nested ConditionMatrixNested;
   typedef typename ThenMatrixType::Nested ThenMatrixNested;
   typedef typename ElseMatrixType::Nested ElseMatrixNested;
@@ -64,11 +65,11 @@ struct ei_traits<Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >
 
 template<typename ConditionMatrixType, typename ThenMatrixType, typename ElseMatrixType>
 class Select : ei_no_assignment_operator,
-  public ThenMatrixType::template MakeBase< Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >::Type
+  public ei_dense_xpr_base< Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >::type
 {
   public:
 
-    typedef typename ThenMatrixType::template MakeBase< Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >::Type Base;
+    typedef typename ei_dense_xpr_base<Select>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Select)
 
     Select(const ConditionMatrixType& conditionMatrix,
diff --git a/Eigen/src/Array/VectorwiseOp.h b/Eigen/src/Array/VectorwiseOp.h
index 205d4d5e9..c1f17f641 100644
--- a/Eigen/src/Array/VectorwiseOp.h
+++ b/Eigen/src/Array/VectorwiseOp.h
@@ -52,6 +52,7 @@ struct ei_traits<PartialReduxExpr<MatrixType, MemberOp, Direction> >
 {
   typedef typename MemberOp::result_type Scalar;
   typedef typename ei_traits<MatrixType>::StorageKind StorageKind;
+  typedef typename ei_traits<MatrixType>::XprKind XprKind;
   typedef typename MatrixType::Scalar InputScalar;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_cleantype<MatrixTypeNested>::type _MatrixTypeNested;
@@ -76,11 +77,11 @@ struct ei_traits<PartialReduxExpr<MatrixType, MemberOp, Direction> >
 
 template< typename MatrixType, typename MemberOp, int Direction>
 class PartialReduxExpr : ei_no_assignment_operator,
-  public MatrixType::template MakeBase< PartialReduxExpr<MatrixType, MemberOp, Direction> >::Type
+  public ei_dense_xpr_base< PartialReduxExpr<MatrixType, MemberOp, Direction> >::type
 {
   public:
 
-    typedef typename MatrixType::template MakeBase< PartialReduxExpr<MatrixType, MemberOp, Direction> >::Type Base;
+    typedef typename ei_dense_xpr_base<PartialReduxExpr>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(PartialReduxExpr)
     typedef typename ei_traits<PartialReduxExpr>::MatrixTypeNested MatrixTypeNested;
     typedef typename ei_traits<PartialReduxExpr>::_MatrixTypeNested _MatrixTypeNested;
diff --git a/Eigen/src/Core/Block.h b/Eigen/src/Core/Block.h
index c02e45074..6f338d020 100644
--- a/Eigen/src/Core/Block.h
+++ b/Eigen/src/Core/Block.h
@@ -104,7 +104,7 @@ template<typename XprType, int BlockRows, int BlockCols, bool HasDirectAccess> c
 {
   public:
 
-    typedef typename XprType::template MakeBase<Block>::Type Base;
+    typedef typename ei_dense_xpr_base<Block>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Block)
 
     class InnerIterator;
diff --git a/Eigen/src/Core/CwiseBinaryOp.h b/Eigen/src/Core/CwiseBinaryOp.h
index 18baf0307..e0617e312 100644
--- a/Eigen/src/Core/CwiseBinaryOp.h
+++ b/Eigen/src/Core/CwiseBinaryOp.h
@@ -153,12 +153,12 @@ class CwiseBinaryOp : ei_no_assignment_operator,
 
 template<typename BinaryOp, typename Lhs, typename Rhs>
 class CwiseBinaryOpImpl<BinaryOp, Lhs, Rhs, Dense>
-  : public Lhs::template MakeBase< CwiseBinaryOp<BinaryOp, Lhs, Rhs> >::Type
+  : public ei_dense_xpr_base<CwiseBinaryOp<BinaryOp, Lhs, Rhs> >::type
 {
     typedef CwiseBinaryOp<BinaryOp, Lhs, Rhs> Derived;
   public:
 
-    typedef typename Lhs::template MakeBase< CwiseBinaryOp<BinaryOp, Lhs, Rhs> >::Type Base;
+    typedef typename ei_dense_xpr_base<CwiseBinaryOp<BinaryOp, Lhs, Rhs> >::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE( Derived )
 
     EIGEN_STRONG_INLINE const Scalar coeff(int row, int col) const
diff --git a/Eigen/src/Core/CwiseNullaryOp.h b/Eigen/src/Core/CwiseNullaryOp.h
index 179df611c..4fce5ec09 100644
--- a/Eigen/src/Core/CwiseNullaryOp.h
+++ b/Eigen/src/Core/CwiseNullaryOp.h
@@ -56,11 +56,11 @@ struct ei_traits<CwiseNullaryOp<NullaryOp, PlainObjectType> > : ei_traits<PlainO
 
 template<typename NullaryOp, typename PlainObjectType>
 class CwiseNullaryOp : ei_no_assignment_operator,
-  public PlainObjectType::template MakeBase< CwiseNullaryOp<NullaryOp, PlainObjectType> >::Type
+  public ei_dense_xpr_base< CwiseNullaryOp<NullaryOp, PlainObjectType> >::type
 {
   public:
 
-    typedef typename PlainObjectType::template MakeBase< CwiseNullaryOp<NullaryOp, PlainObjectType> >::Type Base;
+    typedef typename ei_dense_xpr_base<CwiseNullaryOp>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(CwiseNullaryOp)
 
     CwiseNullaryOp(int rows, int cols, const NullaryOp& func = NullaryOp())
diff --git a/Eigen/src/Core/CwiseUnaryOp.h b/Eigen/src/Core/CwiseUnaryOp.h
index 3ac1ec9ea..8f95b69b0 100644
--- a/Eigen/src/Core/CwiseUnaryOp.h
+++ b/Eigen/src/Core/CwiseUnaryOp.h
@@ -99,13 +99,13 @@ class CwiseUnaryOp : ei_no_assignment_operator,
 // It can be used for any expression types implementing the dense concept.
 template<typename UnaryOp, typename XprType>
 class CwiseUnaryOpImpl<UnaryOp,XprType,Dense>
-  : public XprType::template MakeBase< CwiseUnaryOp<UnaryOp, XprType> >::Type
+  : public ei_dense_xpr_base<CwiseUnaryOp<UnaryOp, XprType> >::type
  {
     typedef CwiseUnaryOp<UnaryOp, XprType> Derived;
 
   public:
 
-    typedef typename XprType::template MakeBase< CwiseUnaryOp<UnaryOp, XprType> >::Type Base;
+    typedef typename ei_dense_xpr_base<CwiseUnaryOp<UnaryOp, XprType> >::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Derived)
 
     EIGEN_STRONG_INLINE const Scalar coeff(int row, int col) const
diff --git a/Eigen/src/Core/CwiseUnaryView.h b/Eigen/src/Core/CwiseUnaryView.h
index 9ce03d64b..1f11e109a 100644
--- a/Eigen/src/Core/CwiseUnaryView.h
+++ b/Eigen/src/Core/CwiseUnaryView.h
@@ -91,13 +91,13 @@ class CwiseUnaryView : ei_no_assignment_operator,
 
 template<typename ViewOp, typename MatrixType>
 class CwiseUnaryViewImpl<ViewOp,MatrixType,Dense>
-  : public MatrixType::template MakeBase< CwiseUnaryView<ViewOp, MatrixType> >::Type
+  : public ei_dense_xpr_base< CwiseUnaryView<ViewOp, MatrixType> >::type
 {
     typedef CwiseUnaryView<ViewOp, MatrixType> Derived;
 
   public:
 
-    typedef typename MatrixType::template MakeBase< CwiseUnaryView<ViewOp, MatrixType> >::Type Base;
+    typedef typename ei_dense_xpr_base<CwiseUnaryView<ViewOp, MatrixType> >::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Derived)
 
     EIGEN_STRONG_INLINE const Scalar coeff(int row, int col) const
diff --git a/Eigen/src/Core/DenseBase.h b/Eigen/src/Core/DenseBase.h
index 200d3087c..8bdcbf52b 100644
--- a/Eigen/src/Core/DenseBase.h
+++ b/Eigen/src/Core/DenseBase.h
@@ -50,24 +50,6 @@ struct ei_outer_stride_at_compile_time<Derived, false>
   enum { ret = 0 };
 };
 
-template<typename Derived, typename XprKind = typename ei_traits<Derived>::XprKind>
-struct ei_dense_xpr_base
-{
-  /* ei_dense_xpr_base should only ever be used on dense expressions, thus falling either into the MatrixXpr or into the ArrayXpr cases */
-};
-
-template<typename Derived>
-struct ei_dense_xpr_base<Derived, MatrixXpr>
-{
-  typedef MatrixBase<Derived> type;
-};
-
-template<typename Derived>
-struct ei_dense_xpr_base<Derived, ArrayXpr>
-{
-  typedef ArrayBase<Derived> type;
-};
-
 /** \class DenseBase
   *
   * \brief Base class for all dense matrices, vectors, and arrays
diff --git a/Eigen/src/Core/Diagonal.h b/Eigen/src/Core/Diagonal.h
index bb1f08837..287ff3f8e 100644
--- a/Eigen/src/Core/Diagonal.h
+++ b/Eigen/src/Core/Diagonal.h
@@ -64,7 +64,7 @@ struct ei_traits<Diagonal<MatrixType,Index> >
 };
 
 template<typename MatrixType, int Index> class Diagonal
-   : public MatrixType::template MakeBase< Diagonal<MatrixType,Index> >::Type
+   : public ei_dense_xpr_base< Diagonal<MatrixType,Index> >::type
 {
     // some compilers may fail to optimize std::max etc in case of compile-time constants...
     EIGEN_STRONG_INLINE int absIndex() const { return m_index.value()>0 ? m_index.value() : -m_index.value(); }
@@ -73,7 +73,7 @@ template<typename MatrixType, int Index> class Diagonal
 
   public:
 
-    typedef typename MatrixType::template MakeBase<Diagonal>::Type Base;
+    typedef typename ei_dense_xpr_base<Diagonal>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(Diagonal)
 
     inline Diagonal(const MatrixType& matrix, int index = Index) : m_matrix(matrix), m_index(index) {}
diff --git a/Eigen/src/Core/ForceAlignedAccess.h b/Eigen/src/Core/ForceAlignedAccess.h
index 300b22329..bd70a11a9 100644
--- a/Eigen/src/Core/ForceAlignedAccess.h
+++ b/Eigen/src/Core/ForceAlignedAccess.h
@@ -41,11 +41,11 @@ struct ei_traits<ForceAlignedAccess<ExpressionType> > : public ei_traits<Express
 {};
 
 template<typename ExpressionType> class ForceAlignedAccess
-  : public ExpressionType::template MakeBase< ForceAlignedAccess<ExpressionType> >::Type
+  : public ei_dense_xpr_base< ForceAlignedAccess<ExpressionType> >::type
 {
   public:
 
-    typedef typename ExpressionType::template MakeBase<ForceAlignedAccess<ExpressionType> >::Type Base;
+    typedef typename ei_dense_xpr_base<ForceAlignedAccess>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(ForceAlignedAccess)
 
     inline ForceAlignedAccess(const ExpressionType& matrix) : m_expression(matrix) {}
diff --git a/Eigen/src/Core/MatrixBase.h b/Eigen/src/Core/MatrixBase.h
index 97a372222..8b4cbf560 100644
--- a/Eigen/src/Core/MatrixBase.h
+++ b/Eigen/src/Core/MatrixBase.h
@@ -58,8 +58,6 @@ template<typename Derived> class MatrixBase
 #ifndef EIGEN_PARSED_BY_DOXYGEN
     /** The base class for a given storage type. */
     typedef MatrixBase StorageBaseType;
-    /** Construct the base class type for the derived class OtherDerived */
-    template <typename OtherDerived> struct MakeBase { typedef MatrixBase<OtherDerived> Type; };
 
     typedef typename ei_traits<Derived>::Scalar Scalar;
     typedef typename ei_packet_traits<Scalar>::type PacketScalar;
diff --git a/Eigen/src/Core/NestByValue.h b/Eigen/src/Core/NestByValue.h
index 497ce828b..a8ca28e0a 100644
--- a/Eigen/src/Core/NestByValue.h
+++ b/Eigen/src/Core/NestByValue.h
@@ -42,11 +42,11 @@ struct ei_traits<NestByValue<ExpressionType> > : public ei_traits<ExpressionType
 {};
 
 template<typename ExpressionType> class NestByValue
-  : public ExpressionType::template MakeBase< NestByValue<ExpressionType> >::Type
+  : public ei_dense_xpr_base< NestByValue<ExpressionType> >::type
 {
   public:
 
-    typedef typename ExpressionType::template MakeBase<NestByValue<ExpressionType> >::Type Base;
+    typedef typename ei_dense_xpr_base<NestByValue>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(NestByValue)
 
     inline NestByValue(const ExpressionType& matrix) : m_expression(matrix) {}
diff --git a/Eigen/src/Core/ReturnByValue.h b/Eigen/src/Core/ReturnByValue.h
index 160b973bd..986bab54d 100644
--- a/Eigen/src/Core/ReturnByValue.h
+++ b/Eigen/src/Core/ReturnByValue.h
@@ -2,7 +2,7 @@
 // for linear algebra.
 //
 // Copyright (C) 2009-2010 Gael Guennebaud <g.gael@free.fr>
-// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2009-2010 Benoit Jacob <jacob.benoit.1@gmail.com>
 //
 // Eigen is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
@@ -53,11 +53,11 @@ struct ei_nested<ReturnByValue<Derived>, n, PlainObject>
 };
 
 template<typename Derived> class ReturnByValue
-  : public ei_traits<Derived>::ReturnType::template MakeBase<ReturnByValue<Derived> >::Type
+  : public ei_dense_xpr_base< ReturnByValue<Derived> >::type
 {
   public:
     typedef typename ei_traits<Derived>::ReturnType ReturnType;
-    typedef typename ReturnType::template MakeBase<ReturnByValue<Derived> >::Type Base;
+    typedef typename ei_dense_xpr_base<ReturnByValue>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(ReturnByValue)
 
     template<typename Dest>
diff --git a/Eigen/src/Core/SelfCwiseBinaryOp.h b/Eigen/src/Core/SelfCwiseBinaryOp.h
index 529a9994d..31d7edc31 100644
--- a/Eigen/src/Core/SelfCwiseBinaryOp.h
+++ b/Eigen/src/Core/SelfCwiseBinaryOp.h
@@ -42,11 +42,11 @@ template<typename BinaryOp, typename MatrixType>
 struct ei_traits<SelfCwiseBinaryOp<BinaryOp,MatrixType> > : ei_traits<MatrixType> {};
 
 template<typename BinaryOp, typename MatrixType> class SelfCwiseBinaryOp
-  : public MatrixType::template MakeBase< SelfCwiseBinaryOp<BinaryOp, MatrixType> >::Type
+  : public ei_dense_xpr_base< SelfCwiseBinaryOp<BinaryOp, MatrixType> >::type
 {
   public:
 
-    typedef typename MatrixType::template MakeBase< SelfCwiseBinaryOp<BinaryOp, MatrixType> >::Type Base;
+    typedef typename ei_dense_xpr_base<SelfCwiseBinaryOp>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(SelfCwiseBinaryOp)
 
     typedef typename ei_packet_traits<Scalar>::type Packet;
diff --git a/Eigen/src/Core/Swap.h b/Eigen/src/Core/Swap.h
index c3c641097..02ff8adc5 100644
--- a/Eigen/src/Core/Swap.h
+++ b/Eigen/src/Core/Swap.h
@@ -35,11 +35,11 @@ template<typename ExpressionType>
 struct ei_traits<SwapWrapper<ExpressionType> > : ei_traits<ExpressionType> {};
 
 template<typename ExpressionType> class SwapWrapper
-  : public ExpressionType::template MakeBase<SwapWrapper<ExpressionType> >::Type
+  : public ei_dense_xpr_base<SwapWrapper<ExpressionType> >::type
 {
   public:
 
-    typedef typename ExpressionType::template MakeBase<SwapWrapper<ExpressionType> >::Type Base;
+    typedef typename ei_dense_xpr_base<SwapWrapper>::type Base;
     EIGEN_DENSE_PUBLIC_INTERFACE(SwapWrapper)
     typedef typename ei_packet_traits<Scalar>::type Packet;
 
diff --git a/Eigen/src/Core/util/XprHelper.h b/Eigen/src/Core/util/XprHelper.h
index f895dad1c..ada93bcd4 100644
--- a/Eigen/src/Core/util/XprHelper.h
+++ b/Eigen/src/Core/util/XprHelper.h
@@ -303,6 +303,24 @@ template<unsigned int Flags> struct ei_are_flags_consistent
   enum { ret = true };
 };
 
+template<typename Derived, typename XprKind = typename ei_traits<Derived>::XprKind>
+struct ei_dense_xpr_base
+{
+  /* ei_dense_xpr_base should only ever be used on dense expressions, thus falling either into the MatrixXpr or into the ArrayXpr cases */
+};
+
+template<typename Derived>
+struct ei_dense_xpr_base<Derived, MatrixXpr>
+{
+  typedef MatrixBase<Derived> type;
+};
+
+template<typename Derived>
+struct ei_dense_xpr_base<Derived, ArrayXpr>
+{
+  typedef ArrayBase<Derived> type;
+};
+
 /** \internal Helper base class to add a scalar multiple operator
   * overloads for complex types */
 template<typename Derived,typename Scalar,typename OtherScalar,