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diff --git a/src/armadillo/include/armadillo_bits/xtrans_mat_bones.hpp b/src/armadillo/include/armadillo_bits/xtrans_mat_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.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup xtrans_mat
+//! @{
+
+
+template<typename eT, bool do_conj>
+class xtrans_mat : public Base< eT, xtrans_mat<eT, do_conj> >
+  {
+  public:
+  
+  typedef eT                                       elem_type;
+  typedef typename get_pod_type<elem_type>::result pod_type;
+  
+  static constexpr bool is_row  = false;
+  static constexpr bool is_col  = false;
+  static constexpr bool is_xvec = false;
+  
+  static constexpr bool really_do_conj = (do_conj && is_cx<eT>::yes);
+  
+  arma_aligned const   Mat<eT>& X;
+  arma_aligned mutable Mat<eT>  Y;
+  
+  arma_aligned const uword n_rows;
+  arma_aligned const uword n_cols;
+  arma_aligned const uword n_elem;
+  
+  inline explicit xtrans_mat(const Mat<eT>& in_X);
+  
+  inline void extract(Mat<eT>& out) const;
+  
+  inline eT operator[](const uword ii) const;
+  inline eT at_alt    (const uword ii) const;
+  
+  arma_inline eT at(const uword in_row, const uword in_col) const;
+  };
+
+
+
+//! @}