text: // 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_minus
  //! @{
  
  
  
  class spglue_minus
    : public traits_glue_or
    {
    public:
    
    template<typename T1, typename T2>
    arma_hot inline static void apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_minus>& X);
    
    template<typename eT, typename T1, typename T2>
    arma_hot inline static void apply_noalias(SpMat<eT>& result, const SpProxy<T1>& pa, const SpProxy<T2>& pb);
    
    template<typename eT>
    arma_hot inline static void apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B);
    };
  
  
  
  class spglue_minus_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_minus_mixed>& expr);
    
    template<typename T1, typename T2>
    inline static void sparse_minus_dense(Mat< typename promote_type<typename T1::elem_type, typename T2::elem_type >::result>& out, const T1& X, const T2& Y);
    
    template<typename T1, typename T2>
    inline static void dense_minus_sparse(Mat< typename promote_type<typename T1::elem_type, typename T2::elem_type >::result>& out, const T1& X, const T2& Y);
    };
  
  
  
  //! @}
  
  