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diff --git a/src/armadillo/include/armadillo_bits/op_unique_bones.hpp b/src/armadillo/include/armadillo_bits/op_unique_bones.hpp
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--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_unique_bones.hpp
@@ -0,0 +1,79 @@
+// 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_unique
+//! @{
+
+
+
+class op_unique
+  : public traits_op_col
+  {
+  public:
+  
+  template<typename T1>
+  inline static bool apply_helper(Mat<typename T1::elem_type>& out, const Proxy<T1>& P, const bool P_is_row);
+  
+  template<typename T1>
+  inline static void apply(Mat<typename T1::elem_type>& out, const Op<T1,op_unique>& in);
+  };
+
+
+
+class op_unique_vec
+  : public traits_op_passthru
+  {
+  public:
+  
+  template<typename T1>
+  inline static void apply(Mat<typename T1::elem_type>& out, const Op<T1,op_unique_vec>& in);
+  };
+
+
+
+template<typename eT>
+struct arma_unique_comparator
+  {
+  arma_inline
+  bool
+  operator() (const eT a, const eT b) const
+    {
+    return ( a < b );
+    }
+  };
+
+
+
+template<typename T>
+struct arma_unique_comparator< std::complex<T> >
+  {
+  arma_inline
+  bool
+  operator() (const std::complex<T>& a, const std::complex<T>& b) const
+    {
+    const T a_real = a.real();
+    const T b_real = b.real();
+    
+    return (  (a_real < b_real) ? true : ((a_real == b_real) ? (a.imag() < b.imag()) : false)  );
+    }
+  };
+
+
+
+//! @}