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diff --git a/src/armadillo/include/armadillo_bits/mtSpOp_bones.hpp b/src/armadillo/include/armadillo_bits/mtSpOp_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 mtSpOp
+//! @{
+
+// Class for delayed multi-type sparse operations.  These are operations where
+// the resulting type is different than the stored type.
+
+
+
+template<typename out_eT, typename T1, typename spop_type>
+class mtSpOp : public SpBase< out_eT, mtSpOp<out_eT, T1, spop_type> >
+  {
+  public:
+  
+  typedef          out_eT                       elem_type;
+  typedef typename get_pod_type<out_eT>::result pod_type;
+  
+  typedef typename T1::elem_type                in_eT;
+  
+  static constexpr bool is_row  = spop_type::template traits<T1>::is_row;
+  static constexpr bool is_col  = spop_type::template traits<T1>::is_col;
+  static constexpr bool is_xvec = spop_type::template traits<T1>::is_xvec;
+  
+  inline explicit  mtSpOp(const T1& in_m);
+  inline           mtSpOp(const T1& in_m, const uword aux_uword_a, const uword aux_uword_b);
+  inline           mtSpOp(const char junk, const T1& in_m, const out_eT in_aux);
+  inline          ~mtSpOp();
+  
+  template<typename eT2>
+  arma_inline bool is_alias(const SpMat<eT2>& X) const;
+  
+  arma_aligned const T1&    m;            //!< the operand; must be derived from SpBase
+  arma_aligned       out_eT aux_out_eT;   //!< auxiliary data, using the element type as specified by the out_eT template parameter
+  arma_aligned       uword  aux_uword_a;
+  arma_aligned       uword  aux_uword_b;
+  };
+
+
+
+//! @}