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diff --git a/src/armadillo/include/armadillo_bits/diagview_bones.hpp b/src/armadillo/include/armadillo_bits/diagview_bones.hpp
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+++ b/src/armadillo/include/armadillo_bits/diagview_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 diagview
+//! @{
+
+
+//! Class for storing data required to extract and set the diagonals of a matrix
+template<typename eT>
+class diagview : public Base< eT, diagview<eT> >
+  {
+  public:
+  
+  typedef eT                                elem_type;
+  typedef typename get_pod_type<eT>::result pod_type;
+  
+  arma_aligned const Mat<eT>& m;
+  
+  static constexpr bool is_row  = false;
+  static constexpr bool is_col  = true;
+  static constexpr bool is_xvec = false;
+  
+  const uword row_offset;
+  const uword col_offset;
+  
+  const uword n_rows;     // equal to n_elem
+  const uword n_elem;
+  
+  static constexpr uword n_cols = 1;
+  
+  
+  protected:
+  
+  arma_inline diagview(const Mat<eT>& in_m, const uword in_row_offset, const uword in_col_offset, const uword len);
+
+  
+  public:
+  
+  inline ~diagview();
+  inline  diagview() = delete;
+  
+  inline  diagview(const diagview&  in);
+  inline  diagview(      diagview&& in);
+  
+  inline void operator=(const diagview& x);
+  
+  inline void operator+=(const eT val);
+  inline void operator-=(const eT val);
+  inline void operator*=(const eT val);
+  inline void operator/=(const eT val);
+  
+  template<typename T1> inline void operator= (const Base<eT,T1>& x);
+  template<typename T1> inline void operator+=(const Base<eT,T1>& x);
+  template<typename T1> inline void operator-=(const Base<eT,T1>& x);
+  template<typename T1> inline void operator%=(const Base<eT,T1>& x);
+  template<typename T1> inline void operator/=(const Base<eT,T1>& x);
+  
+  
+  arma_inline eT  at_alt    (const uword ii) const;
+  
+  arma_inline eT& operator[](const uword ii);
+  arma_inline eT  operator[](const uword ii) const;
+  
+  arma_inline eT&         at(const uword ii);
+  arma_inline eT          at(const uword ii) const;
+  
+  arma_inline eT& operator()(const uword ii);
+  arma_inline eT  operator()(const uword ii) const;
+  
+  arma_inline eT&         at(const uword in_n_row, const uword);
+  arma_inline eT          at(const uword in_n_row, const uword) const;
+   
+  arma_inline eT& operator()(const uword in_n_row, const uword in_n_col);
+  arma_inline eT  operator()(const uword in_n_row, const uword in_n_col) const;
+  
+  
+  inline void replace(const eT old_val, const eT new_val);
+  
+  inline void clean(const pod_type threshold);
+  
+  inline void clamp(const eT min_val, const eT max_val);
+  
+  inline void fill(const eT val);
+  inline void zeros();
+  inline void ones();
+  inline void randu();
+  inline void randn();
+    
+  inline static void extract(Mat<eT>& out, const diagview& in);
+  
+  inline static void  plus_inplace(Mat<eT>& out, const diagview& in);
+  inline static void minus_inplace(Mat<eT>& out, const diagview& in);
+  inline static void schur_inplace(Mat<eT>& out, const diagview& in);
+  inline static void   div_inplace(Mat<eT>& out, const diagview& in);
+  
+  
+  friend class Mat<eT>;
+  friend class subview<eT>;
+  };
+
+
+//! @}