// 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 Glue
//! @{

template <typename T1, typename T2, typename glue_type, bool condition>
struct Glue_traits {};

template <typename T1, typename T2, typename glue_type>
struct Glue_traits<T1, T2, glue_type, true> {
  static constexpr bool is_row = glue_type::template traits<T1, T2>::is_row;
  static constexpr bool is_col = glue_type::template traits<T1, T2>::is_col;
  static constexpr bool is_xvec = glue_type::template traits<T1, T2>::is_xvec;
};

template <typename T1, typename T2, typename glue_type>
struct Glue_traits<T1, T2, glue_type, false> {
  static constexpr bool is_row = false;
  static constexpr bool is_col = false;
  static constexpr bool is_xvec = false;
};

template <typename T1, typename T2, typename glue_type>
class Glue
    : public Base<typename T1::elem_type, Glue<T1, T2, glue_type> >,
      public Glue_traits<T1, T2, glue_type, has_nested_glue_traits<glue_type>::value> {
 public:
  typedef typename T1::elem_type elem_type;
  typedef typename get_pod_type<elem_type>::result pod_type;

  inline Glue(const T1& in_A, const T2& in_B);
  inline Glue(const T1& in_A, const T2& in_B, const uword in_aux_uword);
  inline ~Glue();

  template <typename eT2>
  inline bool is_alias(const Mat<eT2>& X) const;

  const T1& A;      //!< first operand;  must be derived from Base
  const T2& B;      //!< second operand; must be derived from Base
  uword aux_uword;  //!< storage of auxiliary data, uword format
};

//! @}
