Move into version control

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diff --git a/src/armadillo/include/armadillo_bits/glue_kron_meat.hpp b/src/armadillo/include/armadillo_bits/glue_kron_meat.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_kron
+//! @{
+
+
+
+//! \brief
+//! both input matrices have the same element type
+template<typename eT>
+inline
+void
+glue_kron::direct_kron(Mat<eT>& out, const Mat<eT>& A, const Mat<eT>& B)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword A_rows = A.n_rows;
+  const uword A_cols = A.n_cols;
+  const uword B_rows = B.n_rows;
+  const uword B_cols = B.n_cols;
+  
+  out.set_size(A_rows*B_rows, A_cols*B_cols);
+  
+  if(out.is_empty())  { return; }
+  
+  for(uword j = 0; j < A_cols; j++)
+    {
+    for(uword i = 0; i < A_rows; i++)
+      {
+      out.submat(i*B_rows, j*B_cols, (i+1)*B_rows-1, (j+1)*B_cols-1) = A.at(i,j) * B; 
+      }
+    }
+  }
+
+
+
+//! \brief
+//! different types of input matrices
+//! A -> complex, B -> basic element type
+template<typename T>
+inline
+void
+glue_kron::direct_kron(Mat< std::complex<T> >& out, const Mat< std::complex<T> >& A, const Mat<T>& B)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename std::complex<T> eT;
+  
+  const uword A_rows = A.n_rows;
+  const uword A_cols = A.n_cols;
+  const uword B_rows = B.n_rows;
+  const uword B_cols = B.n_cols;
+  
+  out.set_size(A_rows*B_rows, A_cols*B_cols);
+  
+  if(out.is_empty())  { return; }
+  
+  Mat<eT> tmp_B = conv_to< Mat<eT> >::from(B);
+  
+  for(uword j = 0; j < A_cols; j++)
+    {
+    for(uword i = 0; i < A_rows; i++)
+      {
+      out.submat(i*B_rows, j*B_cols, (i+1)*B_rows-1, (j+1)*B_cols-1) = A.at(i,j) * tmp_B; 
+      }
+    }  
+  }
+
+
+
+//! \brief
+//! different types of input matrices
+//! A -> basic element type, B -> complex
+template<typename T>
+inline
+void
+glue_kron::direct_kron(Mat< std::complex<T> >& out, const Mat<T>& A, const Mat< std::complex<T> >& B)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword A_rows = A.n_rows;
+  const uword A_cols = A.n_cols;
+  const uword B_rows = B.n_rows;
+  const uword B_cols = B.n_cols;
+  
+  out.set_size(A_rows*B_rows, A_cols*B_cols);
+  
+  if(out.is_empty())  { return; }
+  
+  for(uword j = 0; j < A_cols; j++)
+    {
+    for(uword i = 0; i < A_rows; i++)
+      {
+      out.submat(i*B_rows, j*B_cols, (i+1)*B_rows-1, (j+1)*B_cols-1) = A.at(i,j) * B; 
+      }
+    }  
+  }
+
+
+
+//! \brief
+//! apply Kronecker product for two objects with same element type
+template<typename T1, typename T2>
+inline
+void
+glue_kron::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_kron>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const quasi_unwrap<T1> UA(X.A);
+  const quasi_unwrap<T2> UB(X.B);
+  
+  if(UA.is_alias(out) || UB.is_alias(out))
+    {
+    Mat<eT> tmp;
+    
+    glue_kron::direct_kron(tmp, UA.M, UB.M);
+    
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    glue_kron::direct_kron(out, UA.M, UB.M); 
+    }
+  }
+
+
+
+//! @}