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diff --git a/src/armadillo/include/armadillo_bits/spglue_schur_bones.hpp b/src/armadillo/include/armadillo_bits/spglue_schur_bones.hpp
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+// 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_schur
+//! @{
+
+
+
+class spglue_schur
+ : public traits_glue_or
+ {
+ public:
+
+ template<typename T1, typename T2>
+ inline static void apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_schur>& X);
+
+ template<typename eT, typename T1, typename T2>
+ inline static void apply_noalias(SpMat<eT>& out, const SpProxy<T1>& pa, const SpProxy<T2>& pb);
+
+ template<typename eT>
+ inline static void apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B);
+ };
+
+
+
+class spglue_schur_misc
+ : public traits_glue_or
+ {
+ public:
+
+ template<typename T1, typename T2>
+ inline static void dense_schur_sparse(SpMat<typename T1::elem_type>& out, const T1& x, const T2& y);
+ };
+
+
+
+class spglue_schur_mixed
+ : public traits_glue_or
+ {
+ public:
+
+ template<typename T1, typename T2>
+ inline static void apply(SpMat<typename eT_promoter<T1,T2>::eT>& out, const mtSpGlue<typename eT_promoter<T1,T2>::eT, T1, T2, spglue_schur_mixed>& expr);
+
+ template<typename T1, typename T2>
+ inline static void dense_schur_sparse(SpMat< typename promote_type<typename T1::elem_type, typename T2::elem_type >::result>& out, const T1& X, const T2& Y);
+ };
+
+
+
+//! @}