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diff --git a/src/armadillo/include/armadillo_bits/Op_bones.hpp b/src/armadillo/include/armadillo_bits/Op_bones.hpp
new file mode 100644
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+++ b/src/armadillo/include/armadillo_bits/Op_bones.hpp
@@ -0,0 +1,69 @@
+// 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 Op
+//! @{
+
+
+
+template<typename T1, typename op_type, bool condition>
+struct Op_traits {};
+  
+
+template<typename T1, typename op_type>
+struct Op_traits<T1, op_type, true>
+  {
+  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;
+  };
+
+template<typename T1, typename op_type>
+struct Op_traits<T1, op_type, false>
+  {
+  static constexpr bool is_row  = false;
+  static constexpr bool is_col  = false;
+  static constexpr bool is_xvec = false;
+  };
+
+
+template<typename T1, typename op_type>
+class Op
+  : public Base< typename T1::elem_type, Op<T1, op_type> >
+  , public Op_traits<T1, op_type, has_nested_op_traits<op_type>::value>
+  {
+  public:
+  
+  typedef typename T1::elem_type                   elem_type;
+  typedef typename get_pod_type<elem_type>::result pod_type;
+  
+  inline explicit Op(const T1& in_m);
+  inline          Op(const T1& in_m, const elem_type in_aux);
+  inline          Op(const T1& in_m, const elem_type in_aux,         const uword in_aux_uword_a, const uword in_aux_uword_b);
+  inline          Op(const T1& in_m, const uword     in_aux_uword_a, const uword in_aux_uword_b);
+  inline         ~Op();
+  
+  arma_aligned const T1&       m;            //!< the operand; must be derived from Base
+  arma_aligned       elem_type aux;          //!< auxiliary data, using the element type as used by T1
+  arma_aligned       uword     aux_uword_a;  //!< auxiliary data, uword format
+  arma_aligned       uword     aux_uword_b;  //!< auxiliary data, uword format
+  };
+
+
+
+//! @}