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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_GENERAL_RANK1UPDATE_H
+#define EIGEN_GENERAL_RANK1UPDATE_H
+
+namespace Eigen {
+namespace internal {
+
+/* Optimized matrix += alpha * uv' */
+template <typename Scalar, typename Index, int StorageOrder, bool ConjLhs, bool ConjRhs>
+struct general_rank1_update;
+
+template <typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
+struct general_rank1_update<Scalar, Index, ColMajor, ConjLhs, ConjRhs> {
+  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) {
+    typedef Map<const Matrix<Scalar, Dynamic, 1> > OtherMap;
+    typedef typename conj_expr_if<ConjLhs, OtherMap>::type ConjRhsType;
+    conj_if<ConjRhs> cj;
+
+    for (Index i = 0; i < cols; ++i)
+      Map<Matrix<Scalar, Dynamic, 1> >(mat + stride * i, rows) += alpha * cj(v[i]) * ConjRhsType(OtherMap(u, rows));
+  }
+};
+
+template <typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
+struct general_rank1_update<Scalar, Index, RowMajor, ConjLhs, ConjRhs> {
+  static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha) {
+    general_rank1_update<Scalar, Index, ColMajor, ConjRhs, ConjRhs>::run(rows, cols, mat, stride, u, v, alpha);
+  }
+};
+
+}  // namespace internal
+}  // namespace Eigen
+
+#endif  // EIGEN_GENERAL_RANK1UPDATE_H