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diff --git a/src/armadillo/include/armadillo_bits/operator_relational.hpp b/src/armadillo/include/armadillo_bits/operator_relational.hpp
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+++ b/src/armadillo/include/armadillo_bits/operator_relational.hpp
@@ -0,0 +1,483 @@
+// 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_relational
+//! @{
+
+
+// <  : lt
+// >  : gt
+// <= : lteq
+// >= : gteq
+// == : eq
+// != : noteq
+// && : and
+// || : or
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_lt>
+  >::result
+operator<
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_lt>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_gt>
+  >::result
+operator>
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_gt>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_lteq>
+  >::result
+operator<=
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_lteq>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_gteq>
+  >::result
+operator>=
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_gteq>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value),
+  const mtGlue<uword, T1, T2, glue_rel_eq>
+  >::result
+operator==
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_eq>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value),
+  const mtGlue<uword, T1, T2, glue_rel_noteq>
+  >::result
+operator!=
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_noteq>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_and>
+  >::result
+operator&&
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_and>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtGlue<uword, T1, T2, glue_rel_or>
+  >::result
+operator||
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtGlue<uword, T1, T2, glue_rel_or>( X, Y );
+  }
+
+
+
+//
+//
+//
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_lt_pre>
+  >::result
+operator<
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_lt_pre>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_lt_post>
+  >::result
+operator<
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_lt_post>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_gt_pre>
+  >::result
+operator>
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_gt_pre>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_gt_post>
+  >::result
+operator>
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_gt_post>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_lteq_pre>
+  >::result
+operator<=
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_lteq_pre>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_lteq_post>
+  >::result
+operator<=
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_lteq_post>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_gteq_pre>
+  >::result
+operator>=
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_gteq_pre>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && (is_cx<typename T1::elem_type>::no)),
+  const mtOp<uword, T1, op_rel_gteq_post>
+  >::result
+operator>=
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_gteq_post>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value,
+  const mtOp<uword, T1, op_rel_eq>
+  >::result
+operator==
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_eq>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value,
+  const mtOp<uword, T1, op_rel_eq>
+  >::result
+operator==
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_eq>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value,
+  const mtOp<uword, T1, op_rel_noteq>
+  >::result
+operator!=
+(const typename T1::elem_type val, const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_noteq>(X, val);
+  }
+
+
+
+template<typename T1>
+inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value,
+  const mtOp<uword, T1, op_rel_noteq>
+  >::result
+operator!=
+(const T1& X, const typename T1::elem_type val)
+  {
+  arma_extra_debug_sigprint();
+  
+  return mtOp<uword, T1, op_rel_noteq>(X, val);
+  }
+
+
+
+//
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtSpGlue<uword, T1, T2, spglue_rel_lt>
+  >::result
+operator<
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  // TODO: ensure T1::elem_type and T2::elem_type are the same
+  
+  return mtSpGlue<uword, T1, T2, spglue_rel_lt>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtSpGlue<uword, T1, T2, spglue_rel_gt>
+  >::result
+operator>
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  // TODO: ensure T1::elem_type and T2::elem_type are the same
+  
+  return mtSpGlue<uword, T1, T2, spglue_rel_gt>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtSpGlue<uword, T1, T2, spglue_rel_and>
+  >::result
+operator&&
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  // TODO: ensure T1::elem_type and T2::elem_type are the same
+  
+  return mtSpGlue<uword, T1, T2, spglue_rel_and>( X, Y );
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && (is_cx<typename T1::elem_type>::no) && (is_cx<typename T2::elem_type>::no)),
+  const mtSpGlue<uword, T1, T2, spglue_rel_or>
+  >::result
+operator||
+(const T1& X, const T2& Y)
+  {
+  arma_extra_debug_sigprint();
+  
+  // TODO: ensure T1::elem_type and T2::elem_type are the same
+  
+  return mtSpGlue<uword, T1, T2, spglue_rel_or>( X, Y );
+  }
+
+
+
+//! @}