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diff --git a/src/armadillo/include/armadillo_bits/unwrap_cube.hpp b/src/armadillo/include/armadillo_bits/unwrap_cube.hpp
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+++ b/src/armadillo/include/armadillo_bits/unwrap_cube.hpp
@@ -0,0 +1,133 @@
+// 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 unwrap_cube
+//! @{
+
+
+
+template<typename T1>
+struct unwrap_cube
+  {
+  typedef typename T1::elem_type eT;
+  
+  inline
+  unwrap_cube(const T1& A)
+    : M(A)
+    {
+    arma_extra_debug_sigprint();
+    }
+  
+  const Cube<eT> M;
+  
+  template<typename eT2>
+  constexpr bool is_alias(const Cube<eT2>&) const { return false; }
+  };
+
+
+
+template<typename eT>
+struct unwrap_cube< Cube<eT> >
+  {
+  inline
+  unwrap_cube(const Cube<eT>& A)
+    : M(A)
+    {
+    arma_extra_debug_sigprint();
+    }
+  
+  const Cube<eT>& M;
+  
+  template<typename eT2>
+  arma_inline bool is_alias(const Cube<eT2>& X) const { return (void_ptr(&M) == void_ptr(&X)); }
+  };
+
+
+
+//
+//
+//
+
+
+
+template<typename T1>
+struct unwrap_cube_check
+  {
+  typedef typename T1::elem_type eT;
+  
+  inline
+  unwrap_cube_check(const T1& A, const Cube<eT>&)
+    : M(A)
+    {
+    arma_extra_debug_sigprint();
+    
+    arma_type_check(( is_arma_cube_type<T1>::value == false ));
+    }
+  
+  inline
+  unwrap_cube_check(const T1& A, const bool)
+    : M(A)
+    {
+    arma_extra_debug_sigprint();
+    
+    arma_type_check(( is_arma_cube_type<T1>::value == false ));
+    }
+  
+  const Cube<eT> M;
+  };
+
+
+
+template<typename eT>
+struct unwrap_cube_check< Cube<eT> >
+  {
+  inline
+  unwrap_cube_check(const Cube<eT>& A, const Cube<eT>& B)
+    : M_local( (&A == &B) ? new Cube<eT>(A) : nullptr )
+    , M      ( (&A == &B) ? (*M_local)      : A       )
+    {
+    arma_extra_debug_sigprint();
+    }
+  
+  
+  inline
+  unwrap_cube_check(const Cube<eT>& A, const bool is_alias)
+    : M_local( is_alias ? new Cube<eT>(A) : nullptr )
+    , M      ( is_alias ? (*M_local)      : A       )
+    {
+    arma_extra_debug_sigprint();
+    }
+  
+  
+  inline
+  ~unwrap_cube_check()
+    {
+    arma_extra_debug_sigprint();
+    
+    if(M_local)  { delete M_local; }
+    }
+  
+  
+  // the order below is important
+  const Cube<eT>* M_local;
+  const Cube<eT>& M;
+  };
+
+
+
+//! @}