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-rw-r--r--Eigen/src/Core/util/ForwardDeclarations.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index a9974c38b..f9370ada9 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -51,6 +51,8 @@ template<int Direction, typename UnaryOp, typename MatrixType> class PartialRedu
template<typename MatrixType, unsigned int Mode> class Part;
template<typename MatrixType, unsigned int Mode> class Extract;
template<typename Derived, bool HasArrayFlag = int(ei_traits<Derived>::Flags) & ArrayBit> class ArrayBase {};
+template<typename Lhs, typename Rhs> class Cross;
+template<typename Scalar> class Quaternion;
template<typename Scalar> struct ei_scalar_sum_op;