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diff --git a/src/armadillo/include/armadillo_bits/newarp_EigsSelect.hpp b/src/armadillo/include/armadillo_bits/newarp_EigsSelect.hpp
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+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+namespace newarp
+{
+
+
+//! The enumeration of selection rules of desired eigenvalues.
+struct EigsSelect
+  {
+  enum SELECT_EIGENVALUE
+    {
+    LARGEST_MAGN = 0,  //!< Select eigenvalues with largest magnitude.
+                       //!< Magnitude means the absolute value for real numbers and norm for complex numbers.
+                       //!< Applies to both symmetric and general eigen solvers.
+
+    LARGEST_REAL,      //!< Select eigenvalues with largest real part. Only for general eigen solvers.
+
+    LARGEST_IMAG,      //!< Select eigenvalues with largest imaginary part (in magnitude). Only for general eigen solvers.
+
+    LARGEST_ALGE,      //!< Select eigenvalues with largest algebraic value, considering any negative sign. Only for symmetric eigen solvers.
+
+    SMALLEST_MAGN,     //!< Select eigenvalues with smallest magnitude. Applies to both symmetric and general eigen solvers.
+
+    SMALLEST_REAL,     //!< Select eigenvalues with smallest real part. Only for general eigen solvers.
+
+    SMALLEST_IMAG,     //!< Select eigenvalues with smallest imaginary part (in magnitude). Only for general eigen solvers.
+
+    SMALLEST_ALGE,     //!< Select eigenvalues with smallest algebraic value. Only for symmetric eigen solvers.
+
+    BOTH_ENDS          //!< Select eigenvalues half from each end of the spectrum.
+                       //!< When `nev` is odd, compute more from the high end. Only for symmetric eigen solvers.
+    };
+  };
+
+
+}  // namespace newarp