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diff --git a/src/armadillo/include/armadillo_bits/newarp_SymEigsShiftSolver_bones.hpp b/src/armadillo/include/armadillo_bits/newarp_SymEigsShiftSolver_bones.hpp
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+++ b/src/armadillo/include/armadillo_bits/newarp_SymEigsShiftSolver_bones.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
+{
+
+
+//! This class implements the eigen solver for real symmetric matrices in the shift-and-invert mode.
+template<typename eT, int SelectionRule, typename OpType>
+class SymEigsShiftSolver : public SymEigsSolver<eT, SelectionRule, OpType>
+  {
+  private:
+
+  const eT sigma;
+
+  // Sort the first nev Ritz pairs in ascending algebraic order
+  // This is used to return the final results
+  void sort_ritzpair();
+
+
+  public:
+
+  //! Constructor to create a solver object.
+  inline SymEigsShiftSolver(const OpType& op_, uword nev_, uword ncv_, const eT sigma_);
+  };
+
+
+}  // namespace newarp