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diff --git a/src/armadillo/include/armadillo_bits/MapMat_bones.hpp b/src/armadillo/include/armadillo_bits/MapMat_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 MapMat
+//! @{
+
+
+
+// this class is for internal use only; subject to change and/or removal without notice
+template<typename eT>
+class MapMat
+  {
+  public:
+  
+  typedef eT                                elem_type;  //!< the type of elements stored in the matrix
+  typedef typename get_pod_type<eT>::result  pod_type;  //!< if eT is std::complex<T>, pod_type is T; otherwise pod_type is eT
+  
+  static constexpr bool is_row  = false;
+  static constexpr bool is_col  = false;
+  static constexpr bool is_xvec = false;
+  
+  const uword n_rows;    //!< number of rows     (read-only)
+  const uword n_cols;    //!< number of columns  (read-only)
+  const uword n_elem;    //!< number of elements (read-only)
+  
+  
+  private:
+  
+  typedef typename std::map<uword, eT> map_type;
+  
+  arma_aligned map_type* map_ptr;
+  
+  
+  public:
+  
+  inline ~MapMat();
+  inline  MapMat();
+  
+  inline explicit MapMat(const uword in_n_rows, const uword in_n_cols);
+  inline explicit MapMat(const SizeMat& s);
+  
+  inline          MapMat(const MapMat<eT>& x);
+  inline void  operator=(const MapMat<eT>& x);
+  
+  inline explicit MapMat(const SpMat<eT>& x);
+  inline void  operator=(const SpMat<eT>& x);
+  
+  inline          MapMat(MapMat<eT>&& x);
+  inline void  operator=(MapMat<eT>&& x);
+  
+  inline void reset();
+  inline void set_size(const uword in_n_rows);
+  inline void set_size(const uword in_n_rows, const uword in_n_cols);
+  inline void set_size(const SizeMat& s);
+  
+  inline void zeros();
+  inline void zeros(const uword in_n_rows);
+  inline void zeros(const uword in_n_rows, const uword in_n_cols);
+  inline void zeros(const SizeMat& s);
+  
+  inline void eye();
+  inline void eye(const uword in_n_rows, const uword in_n_cols);
+  inline void eye(const SizeMat& s);
+  
+  inline void speye();
+  inline void speye(const uword in_n_rows, const uword in_n_cols);
+  inline void speye(const SizeMat& s);
+  
+  arma_warn_unused arma_inline MapMat_val<eT> operator[](const uword index);
+  arma_warn_unused      inline            eT  operator[](const uword index) const;
+  
+  arma_warn_unused arma_inline MapMat_val<eT> operator()(const uword index);
+  arma_warn_unused      inline            eT  operator()(const uword index) const;
+  
+  arma_warn_unused arma_inline MapMat_val<eT>         at(const uword in_row, const uword in_col);
+  arma_warn_unused      inline            eT          at(const uword in_row, const uword in_col) const;
+  
+  arma_warn_unused arma_inline MapMat_val<eT> operator()(const uword in_row, const uword in_col);
+  arma_warn_unused      inline            eT  operator()(const uword in_row, const uword in_col) const;
+  
+  arma_warn_unused inline bool is_empty()  const;
+  arma_warn_unused inline bool is_vec()    const;
+  arma_warn_unused inline bool is_rowvec() const;
+  arma_warn_unused inline bool is_colvec() const;
+  arma_warn_unused inline bool is_square() const;
+  
+  
+  inline void sprandu(const uword in_n_rows, const uword in_n_cols, const double density);
+  
+  inline void print(const std::string& extra_text) const;
+  
+  inline uword get_n_nonzero() const;
+  inline void  get_locval_format(umat& locs, Col<eT>& vals) const;
+  
+  
+  private:
+  
+  inline void init_cold();
+  inline void init_warm(const uword in_n_rows, const uword in_n_cols);
+  
+  arma_inline void   set_val(const uword index, const eT& in_val);
+       inline void erase_val(const uword index);
+  
+  
+  friend class                SpMat<eT>;
+  friend class           MapMat_val<eT>;
+  friend class     SpMat_MapMat_val<eT>;
+  friend class SpSubview_MapMat_val<eT>;
+  };
+
+
+
+template<typename eT>
+class MapMat_val
+  {
+  private:
+  
+  arma_aligned MapMat<eT>& parent;
+  
+  arma_aligned const uword index;
+  
+  inline MapMat_val(MapMat<eT>& in_parent, const uword in_index);
+  
+  friend class MapMat<eT>;
+  
+  
+  public:
+  
+  arma_inline operator eT() const;
+  
+  arma_inline typename get_pod_type<eT>::result real() const;
+  arma_inline typename get_pod_type<eT>::result imag() const;
+  
+  arma_inline void operator= (const MapMat_val<eT>& x);
+  arma_inline void operator= (const eT in_val);
+  arma_inline void operator+=(const eT in_val);
+  arma_inline void operator-=(const eT in_val);
+  arma_inline void operator*=(const eT in_val);
+  arma_inline void operator/=(const eT in_val);
+  
+  arma_inline void operator++();
+  arma_inline void operator++(int);
+  
+  arma_inline void operator--();
+  arma_inline void operator--(int);
+  };
+
+
+
+template<typename eT>
+class SpMat_MapMat_val
+  {
+  private:
+  
+  arma_aligned  SpMat<eT>& s_parent;
+  arma_aligned MapMat<eT>& m_parent;
+  
+  arma_aligned const uword row;
+  arma_aligned const uword col;
+  
+  inline SpMat_MapMat_val(SpMat<eT>& in_s_parent, MapMat<eT>& in_m_parent, const uword in_row, const uword in_col);
+  
+  friend class                SpMat<eT>;
+  friend class               MapMat<eT>;
+  friend class SpSubview_MapMat_val<eT>;
+  
+  
+  public:
+  
+  inline operator eT() const;
+  
+  inline typename get_pod_type<eT>::result real() const;
+  inline typename get_pod_type<eT>::result imag() const;
+  
+  inline SpMat_MapMat_val<eT>& operator= (const SpMat_MapMat_val<eT>& x);
+  
+  inline SpMat_MapMat_val<eT>& operator= (const eT in_val);
+  inline SpMat_MapMat_val<eT>& operator+=(const eT in_val);
+  inline SpMat_MapMat_val<eT>& operator-=(const eT in_val);
+  inline SpMat_MapMat_val<eT>& operator*=(const eT in_val);
+  inline SpMat_MapMat_val<eT>& operator/=(const eT in_val);
+  
+                   inline SpMat_MapMat_val<eT>& operator++();
+  arma_warn_unused inline eT                    operator++(int);
+  
+                   inline SpMat_MapMat_val<eT>& operator--();
+  arma_warn_unused inline eT                    operator--(int);
+  
+  inline void set(const eT in_val);
+  inline void add(const eT in_val);
+  inline void sub(const eT in_val);
+  inline void mul(const eT in_val);
+  inline void div(const eT in_val);
+  };
+
+
+
+template<typename eT>
+class SpSubview_MapMat_val : public SpMat_MapMat_val<eT>
+  {
+  private:
+  
+  arma_inline SpSubview_MapMat_val(SpSubview<eT>& in_sv_parent, MapMat<eT>& in_m_parent, const uword in_row, const uword in_col);
+  
+  arma_aligned SpSubview<eT>& sv_parent;
+  
+  friend class            SpMat<eT>;
+  friend class           MapMat<eT>;
+  friend class        SpSubview<eT>;
+  friend class SpMat_MapMat_val<eT>;
+  
+  
+  public:
+  
+  inline SpSubview_MapMat_val<eT>& operator= (const SpSubview_MapMat_val<eT>& x);
+  
+  inline SpSubview_MapMat_val<eT>& operator= (const eT in_val);
+  inline SpSubview_MapMat_val<eT>& operator+=(const eT in_val);
+  inline SpSubview_MapMat_val<eT>& operator-=(const eT in_val);
+  inline SpSubview_MapMat_val<eT>& operator*=(const eT in_val);
+  inline SpSubview_MapMat_val<eT>& operator/=(const eT in_val);
+  
+                   inline SpSubview_MapMat_val<eT>& operator++();
+  arma_warn_unused inline eT                        operator++(int);
+  
+                   inline SpSubview_MapMat_val<eT>& operator--();
+  arma_warn_unused inline eT                        operator--(int);
+  };
+
+
+
+//! @}