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diff --git a/src/armadillo/include/armadillo_bits/op_dot_bones.hpp b/src/armadillo/include/armadillo_bits/op_dot_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 op_dot
+//! @{
+
+//! \brief
+//! dot product operation 
+
+class op_dot
+  : public traits_op_default
+  {
+  public:
+  
+  template<typename eT>
+  arma_inline static
+  typename arma_not_cx<eT>::result
+  direct_dot_arma(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename eT>
+  arma_hot inline static
+  typename arma_cx_only<eT>::result
+  direct_dot_arma(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename eT>
+  arma_hot inline static typename arma_real_only<eT>::result
+  direct_dot(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename eT>
+  arma_hot inline static typename arma_cx_only<eT>::result
+  direct_dot(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename eT>
+  arma_hot inline static typename arma_integral_only<eT>::result
+  direct_dot(const uword n_elem, const eT* const A, const eT* const B);
+  
+  
+  template<typename eT>
+  arma_hot inline static eT direct_dot(const uword n_elem, const eT* const A, const eT* const B, const eT* C);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename T1::elem_type apply(const T1& X, const T2& Y);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename  arma_not_cx<typename T1::elem_type>::result apply_proxy(const Proxy<T1>& PA, const Proxy<T2>& PB);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename arma_cx_only<typename T1::elem_type>::result apply_proxy(const Proxy<T1>& PA, const Proxy<T2>& PB);
+  };
+
+
+
+//! \brief
+//! normalised dot product operation 
+
+class op_norm_dot
+  : public traits_op_default
+  {
+  public:
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename T1::elem_type apply(const T1& X, const T2& Y);
+  };
+
+
+
+//! \brief
+//! complex conjugate dot product operation
+
+class op_cdot
+  : public traits_op_default
+  {
+  public:
+  
+  template<typename eT>
+  arma_hot inline static eT direct_cdot_arma(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename eT>
+  arma_hot inline static eT direct_cdot(const uword n_elem, const eT* const A, const eT* const B);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename T1::elem_type apply       (const T1& X, const T2& Y);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename T1::elem_type apply_unwrap(const T1& X, const T2& Y);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static typename T1::elem_type apply_proxy (const T1& X, const T2& Y);
+  };
+
+
+
+class op_dot_mixed
+  : public traits_op_default
+  {
+  public:
+  
+  template<typename T1, typename T2>
+  arma_hot inline static
+  typename promote_type<typename T1::elem_type, typename T2::elem_type>::result
+  apply(const T1& A, const T2& B);
+  };
+
+
+
+//! @}