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-rw-r--r--Eigen/src/Core/util/ForwardDeclarations.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 310d0fbde..d755445c1 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -48,6 +48,7 @@ template<typename NullaryOp, typename MatrixType> class CwiseNullaryOp;
template<typename UnaryOp, typename MatrixType> class CwiseUnaryOp;
template<typename ViewOp, typename MatrixType> class CwiseUnaryView;
template<typename BinaryOp, typename Lhs, typename Rhs> class CwiseBinaryOp;
+template<typename Derived, typename Lhs, typename Rhs> class ProductBase;
template<typename Lhs, typename Rhs, int ProductMode> class Product;
template<typename Derived> class DiagonalBase;