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diff --git a/src/armadillo/include/armadillo_bits/operator_div.hpp b/src/armadillo/include/armadillo_bits/operator_div.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 operator_div
+//! @{
+
+
+
+//! Base / scalar
+template<typename T1>
+arma_inline
+typename
+enable_if2< is_arma_type<T1>::value, const eOp< T1, eop_scalar_div_post> >::result
+operator/
+  (
+  const T1&                    X,
+  const typename T1::elem_type k
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return eOp<T1, eop_scalar_div_post>(X, k);
+  }
+
+
+
+//! scalar / Base
+template<typename T1>
+arma_inline
+typename
+enable_if2< is_arma_type<T1>::value, const eOp< T1, eop_scalar_div_pre> >::result
+operator/
+  (
+  const typename T1::elem_type k,
+  const T1&                    X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return eOp<T1, eop_scalar_div_pre>(X, k);
+  }
+
+
+
+//! complex scalar / non-complex Base
+template<typename T1>
+arma_inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_cx<typename T1::elem_type>::no),
+  const mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_pre>
+  >::result
+operator/
+  (
+  const std::complex<typename T1::pod_type>& k,
+  const T1&                                  X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_pre>('j', X, k);
+  }
+
+
+
+//! non-complex Base / complex scalar
+template<typename T1>
+arma_inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_cx<typename T1::elem_type>::no),
+  const mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_post>
+  >::result
+operator/
+  (
+  const T1&                                  X,
+  const std::complex<typename T1::pod_type>& k
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_post>('j', X, k);
+  }
+
+
+
+//! element-wise division of Base objects with same element type
+template<typename T1, typename T2>
+arma_inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  const eGlue<T1, T2, eglue_div>
+  >::result
+operator/
+  (
+  const T1& X,
+  const T2& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return eGlue<T1, T2, eglue_div>(X, Y);
+  }
+
+
+
+//! element-wise division of Base objects with different element types
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_same_type<typename T1::elem_type, typename T2::elem_type>::no)),
+  const mtGlue<typename promote_type<typename T1::elem_type, typename T2::elem_type>::result, T1, T2, glue_mixed_div>
+  >::result
+operator/
+  (
+  const T1& X,
+  const T2& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT1;
+  typedef typename T2::elem_type eT2;
+  
+  typedef typename promote_type<eT1,eT2>::result out_eT;
+  
+  promote_type<eT1,eT2>::check();
+  
+  return mtGlue<out_eT, T1, T2, glue_mixed_div>( X, Y );
+  }
+
+
+
+//! element-wise division of sparse matrix by scalar
+template<typename T1>
+inline
+typename
+enable_if2< is_arma_sparse_type<T1>::value, SpMat<typename T1::elem_type> >::result
+operator/
+  (
+  const T1&                    X,
+  const typename T1::elem_type y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> result(X);
+  
+  result /= y;
+  
+  return result;
+  }
+
+
+
+//! element-wise division of one sparse and one dense object
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  SpMat<typename T1::elem_type>
+  >::result
+operator/
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const SpProxy<T1> pa(x);
+  const   Proxy<T2> pb(y);
+  
+  const uword n_rows = pa.get_n_rows();
+  const uword n_cols = pa.get_n_cols();
+  
+  arma_debug_assert_same_size(n_rows, n_cols, pb.get_n_rows(), pb.get_n_cols(), "element-wise division");
+  
+  uword new_n_nonzero = 0;
+  
+  for(uword col=0; col < n_cols; ++col)
+  for(uword row=0; row < n_rows; ++row)
+    {
+    const eT val = pa.at(row,col) / pb.at(row, col);
+    
+    if(val != eT(0))
+      {
+      ++new_n_nonzero;
+      }
+    }
+  
+  SpMat<eT> result(arma_reserve_indicator(), n_rows, n_cols, new_n_nonzero);
+  
+  uword cur_pos = 0;
+  
+  for(uword col=0; col < n_cols; ++col)
+  for(uword row=0; row < n_rows; ++row)
+    {
+    const eT val = pa.at(row,col) / pb.at(row, col);
+    
+    if(val != eT(0))
+      {
+      access::rw(result.values[cur_pos]) = val;
+      access::rw(result.row_indices[cur_pos]) = row;
+      ++access::rw(result.col_ptrs[col + 1]);
+      ++cur_pos;
+      }
+    }
+  
+  // Fix column pointers
+  for(uword col = 1; col <= result.n_cols; ++col)
+    {
+    access::rw(result.col_ptrs[col]) += result.col_ptrs[col - 1];
+    }
+  
+  return result;
+  }
+
+
+
+//! optimization: element-wise division of sparse / (sparse +/- scalar)
+template<typename T1, typename T2, typename op_type>
+inline
+typename
+enable_if2
+  <
+  (
+  is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value &&
+  is_same_type<typename T1::elem_type, typename T2::elem_type>::yes &&
+      (is_same_type<op_type, op_sp_plus>::value ||
+       is_same_type<op_type, op_sp_minus_pre>::value ||
+       is_same_type<op_type, op_sp_minus_post>::value)
+  ),
+  SpMat<typename T1::elem_type>
+  >::result
+operator/
+  (
+  const T1& x,
+  const SpToDOp<T2, op_type>& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> out;
+  
+  op_type::apply_inside_div(out, x, y);
+  
+  return out;
+  }
+
+
+
+//! element-wise division of one dense and one sparse object
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  Mat<typename T1::elem_type>
+  >::result
+operator/
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const   Proxy<T1> pa(x);
+  const SpProxy<T2> pb(y);
+  
+  const uword n_rows = pa.get_n_rows();
+  const uword n_cols = pa.get_n_cols();
+  
+  arma_debug_assert_same_size(n_rows, n_cols, pb.get_n_rows(), pb.get_n_cols(), "element-wise division");
+  
+  Mat<eT> result(n_rows, n_cols, arma_nozeros_indicator());
+  
+  for(uword col=0; col < n_cols; ++col)
+  for(uword row=0; row < n_rows; ++row)
+    {
+    result.at(row, col) = pa.at(row, col) / pb.at(row, col);
+    }
+  
+  return result;
+  }
+
+
+
+template<typename parent, unsigned int mode, typename T2>
+arma_inline
+Mat<typename parent::elem_type>
+operator/
+  (
+  const subview_each1<parent,mode>&          X,
+  const Base<typename parent::elem_type,T2>& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each1_aux::operator_div(X, Y.get_ref());
+  }
+
+
+
+template<typename T1, typename parent, unsigned int mode>
+arma_inline
+Mat<typename parent::elem_type>
+operator/
+  (
+  const Base<typename parent::elem_type,T1>& X,
+  const subview_each1<parent,mode>&          Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each1_aux::operator_div(X.get_ref(), Y);
+  }
+
+
+
+template<typename parent, unsigned int mode, typename TB, typename T2>
+arma_inline
+Mat<typename parent::elem_type>
+operator/
+  (
+  const subview_each2<parent,mode,TB>&       X,
+  const Base<typename parent::elem_type,T2>& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each2_aux::operator_div(X, Y.get_ref());
+  }
+
+
+
+template<typename T1, typename parent, unsigned int mode, typename TB>
+arma_inline
+Mat<typename parent::elem_type>
+operator/
+  (
+  const Base<typename parent::elem_type,T1>& X,
+  const subview_each2<parent,mode,TB>&       Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each2_aux::operator_div(X.get_ref(), Y);
+  }
+
+
+
+//! @}