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diff --git a/src/armadillo/include/armadillo_bits/glue_times_bones.hpp b/src/armadillo/include/armadillo_bits/glue_times_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 glue_times
+//! @{
+
+
+
+//! \brief
+//! Template metaprogram depth_lhs
+//! calculates the number of Glue<Tx,Ty, glue_type> instances on the left hand side argument of Glue<Tx,Ty, glue_type>
+//! ie. it recursively expands each Tx, until the type of Tx is not "Glue<..,.., glue_type>"  (i.e the "glue_type" changes)
+
+template<typename glue_type, typename T1>
+struct depth_lhs
+  {
+  static constexpr uword num = 0;
+  };
+
+template<typename glue_type, typename T1, typename T2>
+struct depth_lhs< glue_type, Glue<T1,T2,glue_type> >
+  {
+  static constexpr uword num = 1 + depth_lhs<glue_type, T1>::num;
+  };
+
+
+
+template<bool do_inv_detect>
+struct glue_times_redirect2_helper
+  {
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_times>& X);
+  };
+
+
+template<>
+struct glue_times_redirect2_helper<true>
+  {
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_times>& X);
+  };
+
+
+
+template<bool do_inv_detect>
+struct glue_times_redirect3_helper
+  {
+  template<typename T1, typename T2, typename T3>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue< Glue<T1,T2,glue_times>,T3,glue_times>& X);
+  };
+
+
+template<>
+struct glue_times_redirect3_helper<true>
+  {
+  template<typename T1, typename T2, typename T3>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue< Glue<T1,T2,glue_times>,T3,glue_times>& X);
+  };
+
+
+
+template<uword N>
+struct glue_times_redirect
+  {
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_times>& X);
+  };
+
+
+template<>
+struct glue_times_redirect<2>
+  {
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_times>& X);
+  };
+
+
+template<>
+struct glue_times_redirect<3>
+  {
+  template<typename T1, typename T2, typename T3>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue< Glue<T1,T2,glue_times>,T3,glue_times>& X);
+  };
+
+
+template<>
+struct glue_times_redirect<4>
+  {
+  template<typename T1, typename T2, typename T3, typename T4>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue< Glue< Glue<T1,T2,glue_times>, T3, glue_times>, T4, glue_times>& X);
+  };
+
+
+
+//! Class which implements the immediate multiplication of two or more matrices
+class glue_times
+  {
+  public:
+  
+  template<typename T1, typename T2>
+  struct traits
+    {
+    static constexpr bool is_row  = T1::is_row;
+    static constexpr bool is_col  = T2::is_col;
+    static constexpr bool is_xvec = false;
+    };
+  
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_times>& X);
+  
+  
+  template<typename T1>
+  arma_hot inline static void apply_inplace(Mat<typename T1::elem_type>& out, const T1& X);
+  
+  template<typename T1, typename T2>
+  arma_hot inline static void apply_inplace_plus(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_times>& X, const sword sign);
+  
+  //
+  
+  template<typename eT, const bool do_trans_A, const bool do_trans_B, typename TA, typename TB>
+  arma_inline static uword mul_storage_cost(const TA& A, const TB& B);
+  
+  template<typename eT, const bool do_trans_A, const bool do_trans_B, const bool do_scalar_times, typename TA, typename TB>
+  arma_hot inline static void apply(Mat<eT>& out, const TA& A, const TB& B, const eT val);
+  
+  template<typename eT, const bool do_trans_A, const bool do_trans_B, const bool do_trans_C, const bool do_scalar_times, typename TA, typename TB, typename TC>
+  arma_hot inline static void apply(Mat<eT>& out, const TA& A, const TB& B, const TC& C, const eT val);
+  
+  template<typename eT, const bool do_trans_A, const bool do_trans_B, const bool do_trans_C, const bool do_trans_D, const bool do_scalar_times, typename TA, typename TB, typename TC, typename TD>
+  arma_hot inline static void apply(Mat<eT>& out, const TA& A, const TB& B, const TC& C, const TD& D, const eT val);
+  };
+
+
+
+class glue_times_diag
+  {
+  public:
+  
+  template<typename T1, typename T2>
+  struct traits
+    {
+    static constexpr bool is_row  = T1::is_row;
+    static constexpr bool is_col  = T2::is_col;
+    static constexpr bool is_xvec = false;
+    };
+  
+  template<typename T1, typename T2>
+  arma_hot inline static void apply(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_times_diag>& X);
+  };
+
+
+
+//! @}