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-rw-r--r--Eigen/src/Core/ProductEvaluators.h4
-rw-r--r--Eigen/src/Core/util/ForwardDeclarations.h6
2 files changed, 7 insertions, 3 deletions
diff --git a/Eigen/src/Core/ProductEvaluators.h b/Eigen/src/Core/ProductEvaluators.h
index ee87da66d..2f199bc29 100644
--- a/Eigen/src/Core/ProductEvaluators.h
+++ b/Eigen/src/Core/ProductEvaluators.h
@@ -100,8 +100,8 @@ struct evaluator_traits<Product<Lhs, Rhs, AliasFreeProduct> >
// This is the default evaluator implementation for products:
// It creates a temporary and call generic_product_impl
template<typename Lhs, typename Rhs, int Options, int ProductTag, typename LhsShape, typename RhsShape>
-struct product_evaluator<Product<Lhs, Rhs, Options>, ProductTag, LhsShape, RhsShape, typename traits<Lhs>::Scalar,
- typename enable_if<(Options==DefaultProduct || Options==AliasFreeProduct),typename traits<Rhs>::Scalar>::type>
+struct product_evaluator<Product<Lhs, Rhs, Options>, ProductTag, LhsShape, RhsShape, typename traits<Lhs>::Scalar, typename traits<Rhs>::Scalar,
+ EnableIf<(Options==DefaultProduct || Options==AliasFreeProduct)> >
: public evaluator<typename Product<Lhs, Rhs, Options>::PlainObject>::type
{
typedef Product<Lhs, Rhs, Options> XprType;
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index c287c1023..ba75d25af 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -147,6 +147,9 @@ template<typename _Scalar, int Rows=Dynamic, int Cols=Dynamic, int Supers=Dynami
namespace internal {
template<typename Lhs, typename Rhs> struct product_type;
+
+template<bool> struct EnableIf;
+
/** \internal
* \class product_evaluator
* Products need their own evaluator with more template arguments allowing for
@@ -157,7 +160,8 @@ template< typename T,
typename LhsShape = typename evaluator_traits<typename T::Lhs>::Shape,
typename RhsShape = typename evaluator_traits<typename T::Rhs>::Shape,
typename LhsScalar = typename traits<typename T::Lhs>::Scalar,
- typename RhsScalar = typename traits<typename T::Rhs>::Scalar
+ typename RhsScalar = typename traits<typename T::Rhs>::Scalar,
+ typename = EnableIf<true> // extra template parameter for SFINAE-based specialization
> struct product_evaluator;
}