Move into version control

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diff --git a/src/armadillo/include/armadillo_bits/op_diff_meat.hpp b/src/armadillo/include/armadillo_bits/op_diff_meat.hpp
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index 0000000..a5b309b
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+++ b/src/armadillo/include/armadillo_bits/op_diff_meat.hpp
@@ -0,0 +1,224 @@
+// 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_diff
+//! @{
+
+
+template<typename eT>
+inline
+void
+op_diff::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword k, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  uword n_rows = X.n_rows;
+  uword n_cols = X.n_cols;
+  
+  if(dim == 0)
+    {
+    if(n_rows <= k)  { out.set_size(0,n_cols); return; }
+    
+    --n_rows;
+    
+    out.set_size(n_rows,n_cols);
+    
+    for(uword col=0; col < n_cols; ++col)
+      {
+            eT* out_colmem = out.colptr(col);
+      const eT*   X_colmem =   X.colptr(col);
+      
+      for(uword row=0; row < n_rows; ++row)
+        {
+        const eT val0 = X_colmem[row  ];
+        const eT val1 = X_colmem[row+1];
+        
+        out_colmem[row] = val1 - val0;
+        }
+      }
+    
+    if(k >= 2)
+      {
+      for(uword iter=2; iter <= k; ++iter)
+        {
+        --n_rows;
+        
+        for(uword col=0; col < n_cols; ++col)
+          {
+          eT* colmem = out.colptr(col);
+          
+          for(uword row=0; row < n_rows; ++row)
+            {
+            const eT val0 = colmem[row  ];
+            const eT val1 = colmem[row+1];
+            
+            colmem[row] = val1 - val0;
+            }
+          }
+        }
+      
+      out = out( span(0,n_rows-1), span::all );
+      }
+    }
+  else
+  if(dim == 1)
+    {
+    if(n_cols <= k)  { out.set_size(n_rows,0); return; }
+    
+    --n_cols;
+    
+    out.set_size(n_rows,n_cols);
+    
+    if(n_rows == 1)
+      {
+      const eT*   X_mem =   X.memptr();
+            eT* out_mem = out.memptr();
+            
+      for(uword col=0; col < n_cols; ++col)
+        {
+        const eT val0 = X_mem[col  ];
+        const eT val1 = X_mem[col+1];
+        
+        out_mem[col] = val1 - val0;
+        }
+      }
+    else
+      {
+      for(uword col=0; col < n_cols; ++col)
+        {
+        eT* out_col_mem = out.colptr(col);
+              
+        const eT* X_col0_mem = X.colptr(col  );
+        const eT* X_col1_mem = X.colptr(col+1);
+        
+        for(uword row=0; row < n_rows; ++row)
+          {
+          out_col_mem[row] = X_col1_mem[row] - X_col0_mem[row];
+          }
+        }
+      }
+    
+    if(k >= 2)
+      {
+      for(uword iter=2; iter <= k; ++iter)
+        {
+        --n_cols;
+        
+        if(n_rows == 1)
+          {
+          eT* out_mem = out.memptr();
+                
+          for(uword col=0; col < n_cols; ++col)
+            {
+            const eT val0 = out_mem[col  ];
+            const eT val1 = out_mem[col+1];
+            
+            out_mem[col] = val1 - val0;
+            }
+          }
+        else
+          {
+          for(uword col=0; col < n_cols; ++col)
+            {
+                  eT* col0_mem = out.colptr(col  );
+            const eT* col1_mem = out.colptr(col+1);
+            
+            for(uword row=0; row < n_rows; ++row)
+              {
+              col0_mem[row] = col1_mem[row] - col0_mem[row];
+              }
+            }
+          }
+        }
+      
+      out = out( span::all, span(0,n_cols-1) );
+      }
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_diff::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_diff>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword k   = in.aux_uword_a;
+  const uword dim = in.aux_uword_b;
+  
+  arma_debug_check( (dim > 1), "diff(): parameter 'dim' must be 0 or 1" );
+  
+  if(k == 0)  { out = in.m; return; }
+  
+  const quasi_unwrap<T1> U(in.m);
+  
+  if(U.is_alias(out))
+    {
+    Mat<eT> tmp;
+    
+    op_diff::apply_noalias(tmp, U.M, k, dim);
+    
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    op_diff::apply_noalias(out, U.M, k, dim);
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_diff_vec::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_diff_vec>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword k = in.aux_uword_a;
+  
+  if(k == 0)  { out = in.m; return; }
+  
+  const quasi_unwrap<T1> U(in.m);
+  
+  const uword dim = (T1::is_xvec) ? uword(U.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
+  
+  if(U.is_alias(out))
+    {
+    Mat<eT> tmp;
+    
+    op_diff::apply_noalias(tmp, U.M, k, dim);
+    
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    op_diff::apply_noalias(out, U.M, k, dim);
+    }
+  }
+
+
+
+//! @}
+