// 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 Op
//! @{

template <typename T1, typename op_type, bool condition>
struct Op_traits {};

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

template <typename T1, typename op_type>
struct Op_traits<T1, op_type, false> {
  static constexpr bool is_row = false;
  static constexpr bool is_col = false;
  static constexpr bool is_xvec = false;
};

template <typename T1, typename op_type>
class Op : public Base<typename T1::elem_type, Op<T1, op_type> >,
           public Op_traits<T1, op_type, has_nested_op_traits<op_type>::value> {
 public:
  typedef typename T1::elem_type elem_type;
  typedef typename get_pod_type<elem_type>::result pod_type;

  inline explicit Op(const T1& in_m);
  inline Op(const T1& in_m, const elem_type in_aux);
  inline Op(const T1& in_m, const elem_type in_aux, const uword in_aux_uword_a,
            const uword in_aux_uword_b);
  inline Op(const T1& in_m, const uword in_aux_uword_a, const uword in_aux_uword_b);
  inline ~Op();

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

  arma_aligned const T1& m;    //!< the operand; must be derived from Base
  arma_aligned elem_type aux;  //!< auxiliary data, using the element type as used by T1
  arma_aligned uword aux_uword_a;  //!< auxiliary data, uword format
  arma_aligned uword aux_uword_b;  //!< auxiliary data, uword format
};

//! @}
