// 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 Gen
//! @{

//! support class for generator functions (zeros, ones, eye)
template <typename T1, typename gen_type>
class Gen : public Base<typename T1::elem_type, Gen<T1, gen_type> > {
 public:
  typedef typename T1::elem_type elem_type;
  typedef typename get_pod_type<elem_type>::result pod_type;

  static constexpr bool use_at = (is_same_type<gen_type, gen_eye>::value);
  static constexpr bool is_simple = (is_same_type<gen_type, gen_ones>::value) ||
                                    (is_same_type<gen_type, gen_zeros>::value);

  static constexpr bool is_row = T1::is_row;
  static constexpr bool is_col = T1::is_col;
  static constexpr bool is_xvec = T1::is_xvec;

  arma_aligned const uword n_rows;
  arma_aligned const uword n_cols;

  arma_inline Gen(const uword in_n_rows, const uword in_n_cols);
  arma_inline ~Gen();

  arma_inline elem_type operator[](const uword ii) const;
  arma_inline elem_type at(const uword r, const uword c) const;
  arma_inline elem_type at_alt(const uword ii) const;

  inline void apply(Mat<elem_type>& out) const;
  inline void apply_inplace_plus(Mat<elem_type>& out) const;
  inline void apply_inplace_minus(Mat<elem_type>& out) const;
  inline void apply_inplace_schur(Mat<elem_type>& out) const;
  inline void apply_inplace_div(Mat<elem_type>& out) const;

  inline void apply(subview<elem_type>& out) const;

  template <typename eT2>
  constexpr bool is_alias(const Mat<eT2>&) const {
    return false;
  }
};

//! @}
