// SPDX-License-Identifier: Apache-2.0
// 
// Copyright 2008-2016 Conrad Sanderson (https://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
// https://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 subview_each
//! @{



template<typename parent, unsigned int mode>
class subview_each_common
  {
  public:
  
  typedef typename parent::elem_type eT;
  
  const parent& P;
  
  template<typename eT2>
  inline void check_size(const Mat<eT2>& A) const;
  
  
  protected:
  
  arma_inline subview_each_common(const parent& in_P);
       inline subview_each_common() = delete;
  
  arma_inline const Mat<typename parent::elem_type>& get_mat_ref_helper(const Mat    <typename parent::elem_type>& X) const;
  arma_inline const Mat<typename parent::elem_type>& get_mat_ref_helper(const subview<typename parent::elem_type>& X) const;
  
  arma_inline const Mat<typename parent::elem_type>& get_mat_ref() const;
  
  template<typename eT2>
  arma_cold inline const std::string incompat_size_string(const Mat<eT2>& A) const;
  };



// NOTE: deliberately not derived from Base
template<typename parent, unsigned int mode>
class subview_each1 : public subview_each_common<parent, mode>
  {
  protected:
  
  arma_inline subview_each1(const parent& in_P);
  
  
  public:
  
  typedef typename parent::elem_type eT;
  
  inline ~subview_each1();
  inline  subview_each1() = delete;
  
  // deliberately returning void
  template<typename T1> inline void operator=  (const Base<eT,T1>& x);
  template<typename T1> inline void operator+= (const Base<eT,T1>& x);
  template<typename T1> inline void operator-= (const Base<eT,T1>& x);
  template<typename T1> inline void operator%= (const Base<eT,T1>& x);
  template<typename T1> inline void operator/= (const Base<eT,T1>& x);
  
  
  friend class Mat<eT>;
  friend class subview<eT>;
  };



// NOTE: deliberately not derived from Base
template<typename parent, unsigned int mode, typename TB>
class subview_each2 : public subview_each_common<parent, mode>
  {
  protected:
  
  inline subview_each2(const parent& in_P, const Base<uword, TB>& in_indices);
  
  
  public:
  
  const Base<uword, TB>& base_indices;
  
  typedef typename parent::elem_type eT;
  
  inline void check_indices(const Mat<uword>& indices) const;
  
  inline ~subview_each2();
  inline  subview_each2() = delete;
  
  // deliberately returning void
  template<typename T1> inline void operator=  (const Base<eT,T1>& x);
  template<typename T1> inline void operator+= (const Base<eT,T1>& x);
  template<typename T1> inline void operator-= (const Base<eT,T1>& x);
  template<typename T1> inline void operator%= (const Base<eT,T1>& x);
  template<typename T1> inline void operator/= (const Base<eT,T1>& x);
  
  
  friend class Mat<eT>;
  friend class subview<eT>;
  };



class subview_each1_aux
  {
  public:
  
  template<typename parent, unsigned int mode, typename T2>
  static inline Mat<typename parent::elem_type> operator_plus(const subview_each1<parent,mode>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename parent, unsigned int mode, typename T2>
  static inline Mat<typename parent::elem_type> operator_minus(const subview_each1<parent,mode>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename T1, typename parent, unsigned int mode>
  static inline Mat<typename parent::elem_type> operator_minus(const Base<typename parent::elem_type,T1>& X, const subview_each1<parent,mode>& Y);
  
  template<typename parent, unsigned int mode, typename T2>
  static inline Mat<typename parent::elem_type> operator_schur(const subview_each1<parent,mode>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename parent, unsigned int mode, typename T2>
  static inline Mat<typename parent::elem_type> operator_div(const subview_each1<parent,mode>& X,const Base<typename parent::elem_type,T2>& Y);
  
  template<typename T1, typename parent, unsigned int mode>
  static inline Mat<typename parent::elem_type> operator_div(const Base<typename parent::elem_type,T1>& X, const subview_each1<parent,mode>& Y);
  };



class subview_each2_aux
  {
  public:
  
  template<typename parent, unsigned int mode, typename TB, typename T2>
  static inline Mat<typename parent::elem_type> operator_plus(const subview_each2<parent,mode,TB>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename parent, unsigned int mode, typename TB, typename T2>
  static inline Mat<typename parent::elem_type> operator_minus(const subview_each2<parent,mode,TB>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename T1, typename parent, unsigned int mode, typename TB>
  static inline Mat<typename parent::elem_type> operator_minus(const Base<typename parent::elem_type,T1>& X, const subview_each2<parent,mode,TB>& Y);
  
  template<typename parent, unsigned int mode, typename TB, typename T2>
  static inline Mat<typename parent::elem_type> operator_schur(const subview_each2<parent,mode,TB>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename parent, unsigned int mode, typename TB, typename T2>
  static inline Mat<typename parent::elem_type> operator_div(const subview_each2<parent,mode,TB>& X, const Base<typename parent::elem_type,T2>& Y);
  
  template<typename T1, typename parent, unsigned int mode, typename TB>
  static inline Mat<typename parent::elem_type> operator_div(const Base<typename parent::elem_type,T1>& X, const subview_each2<parent,mode,TB>& Y);
  };



//! @}