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-rw-r--r--Eigen/src/Core/util/Constants.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/Eigen/src/Core/util/Constants.h b/Eigen/src/Core/util/Constants.h
index 3ab8d0ed3..c0463583d 100644
--- a/Eigen/src/Core/util/Constants.h
+++ b/Eigen/src/Core/util/Constants.h
@@ -443,6 +443,9 @@ enum Action {GetAction, SetAction};
/** The type used to identify a dense storage. */
struct Dense {};
+/** The type used to identify a permutation storage. */
+struct PermutationStorage {};
+
/** The type used to identify a matrix expression */
struct MatrixXpr {};