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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 953f52af0..676dee15d 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -187,6 +187,7 @@ template<typename Scalar> struct scalar_real_op;
template<typename Scalar> struct scalar_imag_op;
template<typename Scalar> struct scalar_abs_op;
template<typename Scalar> struct scalar_abs2_op;
+template<typename LhsScalar,typename RhsScalar=LhsScalar> struct scalar_absolute_difference_op;
template<typename Scalar> struct scalar_sqrt_op;
template<typename Scalar> struct scalar_rsqrt_op;
template<typename Scalar> struct scalar_exp_op;