Move into version control

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diff --git a/src/armadillo/include/armadillo_bits/spglue_plus_meat.hpp b/src/armadillo/include/armadillo_bits/spglue_plus_meat.hpp
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+++ b/src/armadillo/include/armadillo_bits/spglue_plus_meat.hpp
@@ -0,0 +1,295 @@
+// 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 spglue_plus
+//! @{
+
+
+
+template<typename T1, typename T2>
+inline
+void
+spglue_plus::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_plus>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const SpProxy<T1> pa(X.A);
+  const SpProxy<T2> pb(X.B);
+  
+  const bool is_alias = pa.is_alias(out) || pb.is_alias(out);
+  
+  if(is_alias == false)
+    {
+    spglue_plus::apply_noalias(out, pa, pb);
+    }
+  else
+    {
+    SpMat<eT> tmp;
+    
+    spglue_plus::apply_noalias(tmp, pa, pb);
+    
+    out.steal_mem(tmp);
+    }
+  }
+
+
+
+template<typename eT, typename T1, typename T2>
+inline
+void
+spglue_plus::apply_noalias(SpMat<eT>& out, const SpProxy<T1>& pa, const SpProxy<T2>& pb)
+  {
+  arma_extra_debug_sigprint();
+  
+  arma_debug_assert_same_size(pa.get_n_rows(), pa.get_n_cols(), pb.get_n_rows(), pb.get_n_cols(), "addition");
+  
+  if(pa.get_n_nonzero() == 0)  { out = pb.Q; return; }
+  if(pb.get_n_nonzero() == 0)  { out = pa.Q; return; }
+  
+  const uword max_n_nonzero = pa.get_n_nonzero() + pb.get_n_nonzero();
+  
+  // Resize memory to upper bound
+  out.reserve(pa.get_n_rows(), pa.get_n_cols(), max_n_nonzero);
+  
+  // Now iterate across both matrices.
+  typename SpProxy<T1>::const_iterator_type x_it  = pa.begin();
+  typename SpProxy<T1>::const_iterator_type x_end = pa.end();
+  
+  typename SpProxy<T2>::const_iterator_type y_it  = pb.begin();
+  typename SpProxy<T2>::const_iterator_type y_end = pb.end();
+  
+  uword count = 0;
+  
+  while( (x_it != x_end) || (y_it != y_end) )
+    {
+    eT out_val;
+    
+    const uword x_it_col = x_it.col();
+    const uword x_it_row = x_it.row();
+    
+    const uword y_it_col = y_it.col();
+    const uword y_it_row = y_it.row();
+    
+    bool use_y_loc = false;
+    
+    if(x_it == y_it)
+      {
+      out_val = (*x_it) + (*y_it);
+      
+      ++x_it;
+      ++y_it;
+      }
+    else
+      {
+      if((x_it_col < y_it_col) || ((x_it_col == y_it_col) && (x_it_row < y_it_row))) // if y is closer to the end
+        {
+        out_val = (*x_it);
+        
+        ++x_it;
+        }
+      else
+        {
+        out_val = (*y_it);
+        
+        ++y_it;
+        
+        use_y_loc = true;
+        }
+      }
+    
+    if(out_val != eT(0))
+      {
+      access::rw(out.values[count]) = out_val;
+      
+      const uword out_row = (use_y_loc == false) ? x_it_row : y_it_row;
+      const uword out_col = (use_y_loc == false) ? x_it_col : y_it_col;
+      
+      access::rw(out.row_indices[count]) = out_row;
+      access::rw(out.col_ptrs[out_col + 1])++;
+      ++count;
+      }
+    
+    arma_check( (count > max_n_nonzero), "internal error: spglue_plus::apply_noalias(): count > max_n_nonzero" );
+    }
+  
+  const uword out_n_cols = out.n_cols;
+  
+  uword* col_ptrs = access::rwp(out.col_ptrs);
+  
+  // Fix column pointers to be cumulative.
+  for(uword c = 1; c <= out_n_cols; ++c)
+    {
+    col_ptrs[c] += col_ptrs[c - 1];
+    }
+  
+  if(count < max_n_nonzero)
+    {
+    if(count <= (max_n_nonzero/2))
+      {
+      out.mem_resize(count);
+      }
+    else
+      {
+      // quick resize without reallocating memory and copying data
+      access::rw(         out.n_nonzero) = count;
+      access::rw(     out.values[count]) = eT(0);
+      access::rw(out.row_indices[count]) = uword(0);
+      }
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spglue_plus::apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B)
+  {
+  arma_extra_debug_sigprint();
+  
+  const SpProxy< SpMat<eT> > pa(A);
+  const SpProxy< SpMat<eT> > pb(B);
+  
+  spglue_plus::apply_noalias(out, pa, pb);
+  }
+
+
+
+//
+
+
+
+template<typename T1, typename T2>
+inline
+void
+spglue_plus_mixed::apply(SpMat<typename eT_promoter<T1,T2>::eT>& out, const mtSpGlue<typename eT_promoter<T1,T2>::eT, T1, T2, spglue_plus_mixed>& expr)
+  {
+  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();
+  
+  if( (is_same_type<eT1,out_eT>::no) && (is_same_type<eT2,out_eT>::yes) )
+    {
+    // upgrade T1
+    
+    const unwrap_spmat<T1> UA(expr.A);
+    const unwrap_spmat<T2> UB(expr.B);
+    
+    const SpMat<eT1>& A = UA.M;
+    const SpMat<eT2>& B = UB.M;
+    
+    SpMat<out_eT> AA(arma_layout_indicator(), A);
+    
+    for(uword i=0; i < A.n_nonzero; ++i)  { access::rw(AA.values[i]) = out_eT(A.values[i]); }
+    
+    const SpMat<out_eT>& BB = reinterpret_cast< const SpMat<out_eT>& >(B);
+    
+    out = AA + BB;
+    }
+  else
+  if( (is_same_type<eT1,out_eT>::yes) && (is_same_type<eT2,out_eT>::no) )
+    {
+    // upgrade T2 
+    
+    const unwrap_spmat<T1> UA(expr.A);
+    const unwrap_spmat<T2> UB(expr.B);
+    
+    const SpMat<eT1>& A = UA.M;
+    const SpMat<eT2>& B = UB.M;
+    
+    const SpMat<out_eT>& AA = reinterpret_cast< const SpMat<out_eT>& >(A);
+    
+    SpMat<out_eT> BB(arma_layout_indicator(), B);
+    
+    for(uword i=0; i < B.n_nonzero; ++i)  { access::rw(BB.values[i]) = out_eT(B.values[i]); }
+    
+    out = AA + BB;
+    }
+  else
+    {
+    // upgrade T1 and T2
+    
+    const unwrap_spmat<T1> UA(expr.A);
+    const unwrap_spmat<T2> UB(expr.B);
+    
+    const SpMat<eT1>& A = UA.M;
+    const SpMat<eT2>& B = UB.M;
+    
+    SpMat<out_eT> AA(arma_layout_indicator(), A);
+    SpMat<out_eT> BB(arma_layout_indicator(), B);
+    
+    for(uword i=0; i < A.n_nonzero; ++i)  { access::rw(AA.values[i]) = out_eT(A.values[i]); }
+    for(uword i=0; i < B.n_nonzero; ++i)  { access::rw(BB.values[i]) = out_eT(B.values[i]); }
+    
+    out = AA + BB;
+    }
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+void
+spglue_plus_mixed::dense_plus_sparse(Mat< typename promote_type<typename T1::elem_type, typename T2::elem_type >::result>& out, 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();
+  
+  if(is_same_type<eT1,out_eT>::no)
+    {
+    out = conv_to< Mat<out_eT> >::from(X);
+    }
+  else
+    {
+    const quasi_unwrap<T1> UA(X);
+    
+    const Mat<eT1>& A = UA.M;
+    
+    out = reinterpret_cast< const Mat<out_eT>& >(A);
+    }
+  
+  const SpProxy<T2> pb(Y);
+  
+  arma_debug_assert_same_size( out.n_rows, out.n_cols, pb.get_n_rows(), pb.get_n_cols(), "addition" );
+  
+  typename SpProxy<T2>::const_iterator_type it     = pb.begin();
+  typename SpProxy<T2>::const_iterator_type it_end = pb.end();
+  
+  while(it != it_end)
+    {
+    out.at(it.row(), it.col()) += out_eT(*it);
+    ++it;
+    }
+  }
+
+
+
+//! @}