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diff --git a/src/armadillo/include/armadillo_bits/SpToDOp_bones.hpp b/src/armadillo/include/armadillo_bits/SpToDOp_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 SpToDOp
+//! @{
+
+
+
+//! Class for storing data required for delayed unary operations on a sparse
+//! matrix that produce a dense matrix; the data for storage may include
+//! the operand (eg. the matrix to which the operation is to be applied) and the unary operator (eg. inverse).
+//! The operand is stored as a reference (which can be optimised away),
+//! while the operator is "stored" through the template definition (op_type).
+//! The operands can be 'SpMat', 'SpRow', 'SpCol', 'SpOp', and 'SpGlue'.
+//! Note that as 'SpGlue' can be one of the operands, more than one matrix can be stored.
+//!
+//! For example, we could have:
+//! SpToDOp< SpGlue< SpMat, SpMat, sp_glue_times >, op_sp_plus >
+
+template<typename T1, typename op_type>
+class SpToDOp : public Base< typename T1::elem_type, SpToDOp<T1, op_type> >
+  {
+  public:
+  
+  typedef typename T1::elem_type                   elem_type;
+  typedef typename get_pod_type<elem_type>::result pod_type;
+  
+  inline explicit SpToDOp(const T1& in_m);
+  inline          SpToDOp(const T1& in_m, const elem_type in_aux);
+  inline         ~SpToDOp();
+  
+  arma_aligned const T1&       m;            //!< the operand; must be derived from SpBase
+  arma_aligned       elem_type aux;          //!< auxiliary data, using the element type as used by T1
+  
+  static constexpr bool is_row  = op_type::template traits<T1>::is_row;
+  static constexpr bool is_col  = op_type::template traits<T1>::is_col;
+  static constexpr bool is_xvec = op_type::template traits<T1>::is_xvec;
+  };
+
+
+
+//! @}