// 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 Row
//! @{

//! Class for row vectors (matrices with only one row)

template <typename eT>
class Row : public Mat<eT> {
 public:
  typedef eT elem_type;
  typedef typename get_pod_type<eT>::result pod_type;

  static constexpr bool is_col = false;
  static constexpr bool is_row = true;
  static constexpr bool is_xvec = false;

  inline Row();
  inline Row(const Row<eT>& X);

  inline explicit Row(const uword N);
  inline explicit Row(const uword in_rows, const uword in_cols);
  inline explicit Row(const SizeMat& s);

  template <bool do_zeros>
  inline explicit Row(const uword N, const arma_initmode_indicator<do_zeros>&);
  template <bool do_zeros>
  inline explicit Row(const uword in_rows, const uword in_cols,
                      const arma_initmode_indicator<do_zeros>&);
  template <bool do_zeros>
  inline explicit Row(const SizeMat& s, const arma_initmode_indicator<do_zeros>&);

  template <typename fill_type>
  inline Row(const uword n_elem, const fill::fill_class<fill_type>& f);
  template <typename fill_type>
  inline Row(const uword in_rows, const uword in_cols,
             const fill::fill_class<fill_type>& f);
  template <typename fill_type>
  inline Row(const SizeMat& s, const fill::fill_class<fill_type>& f);

  inline Row(const uword N, const fill::scalar_holder<eT> f);
  inline Row(const uword in_rows, const uword in_cols, const fill::scalar_holder<eT> f);
  inline Row(const SizeMat& s, const fill::scalar_holder<eT> f);

  inline Row(const char* text);
  inline Row& operator=(const char* text);

  inline Row(const std::string& text);
  inline Row& operator=(const std::string& text);

  inline Row(const std::vector<eT>& x);
  inline Row& operator=(const std::vector<eT>& x);

  inline Row(const std::initializer_list<eT>& list);
  inline Row& operator=(const std::initializer_list<eT>& list);

  inline Row(Row&& m);
  inline Row& operator=(Row&& m);

  // inline            Row(Mat<eT>&& m);
  // inline Row& operator=(Mat<eT>&& m);

  inline Row& operator=(const eT val);
  inline Row& operator=(const Row& X);

  template <typename T1>
  inline Row(const Base<eT, T1>& X);
  template <typename T1>
  inline Row& operator=(const Base<eT, T1>& X);

  template <typename T1>
  inline explicit Row(const SpBase<eT, T1>& X);
  template <typename T1>
  inline Row& operator=(const SpBase<eT, T1>& X);

  inline Row(eT* aux_mem, const uword aux_length, const bool copy_aux_mem = true,
             const bool strict = false);
  inline Row(const eT* aux_mem, const uword aux_length);

  template <typename T1, typename T2>
  inline explicit Row(const Base<pod_type, T1>& A, const Base<pod_type, T2>& B);

  template <typename T1>
  inline Row(const BaseCube<eT, T1>& X);
  template <typename T1>
  inline Row& operator=(const BaseCube<eT, T1>& X);

  inline Row(const subview_cube<eT>& X);
  inline Row& operator=(const subview_cube<eT>& X);

  arma_frown("use braced initialiser list instead") inline mat_injector<Row> operator<<(
      const eT val);

  arma_warn_unused arma_inline const Op<Row<eT>, op_htrans> t() const;
  arma_warn_unused arma_inline const Op<Row<eT>, op_htrans> ht() const;
  arma_warn_unused arma_inline const Op<Row<eT>, op_strans> st() const;

  arma_warn_unused arma_inline const Op<Row<eT>, op_strans> as_col() const;

  arma_inline subview_row<eT> col(const uword col_num);
  arma_inline const subview_row<eT> col(const uword col_num) const;

  using Mat<eT>::cols;
  using Mat<eT>::operator();

  arma_inline subview_row<eT> cols(const uword in_col1, const uword in_col2);
  arma_inline const subview_row<eT> cols(const uword in_col1, const uword in_col2) const;

  arma_inline subview_row<eT> subvec(const uword in_col1, const uword in_col2);
  arma_inline const subview_row<eT> subvec(const uword in_col1,
                                           const uword in_col2) const;

  arma_inline subview_row<eT> cols(const span& col_span);
  arma_inline const subview_row<eT> cols(const span& col_span) const;

  arma_inline subview_row<eT> subvec(const span& col_span);
  arma_inline const subview_row<eT> subvec(const span& col_span) const;

  arma_inline subview_row<eT> operator()(const span& col_span);
  arma_inline const subview_row<eT> operator()(const span& col_span) const;

  arma_inline subview_row<eT> subvec(const uword start_col, const SizeMat& s);
  arma_inline const subview_row<eT> subvec(const uword start_col, const SizeMat& s) const;

  arma_inline subview_row<eT> head(const uword N);
  arma_inline const subview_row<eT> head(const uword N) const;

  arma_inline subview_row<eT> tail(const uword N);
  arma_inline const subview_row<eT> tail(const uword N) const;

  arma_inline subview_row<eT> head_cols(const uword N);
  arma_inline const subview_row<eT> head_cols(const uword N) const;

  arma_inline subview_row<eT> tail_cols(const uword N);
  arma_inline const subview_row<eT> tail_cols(const uword N) const;

  inline void shed_col(const uword col_num);
  inline void shed_cols(const uword in_col1, const uword in_col2);

  template <typename T1>
  inline void shed_cols(const Base<uword, T1>& indices);

  arma_deprecated inline void insert_cols(const uword col_num, const uword N,
                                          const bool set_to_zero);
  inline void insert_cols(const uword col_num, const uword N);

  template <typename T1>
  inline void insert_cols(const uword col_num, const Base<eT, T1>& X);

  arma_warn_unused arma_inline eT& at(const uword i);
  arma_warn_unused arma_inline const eT& at(const uword i) const;

  arma_warn_unused arma_inline eT& at(const uword in_row, const uword in_col);
  arma_warn_unused arma_inline const eT& at(const uword in_row, const uword in_col) const;

  typedef eT* row_iterator;
  typedef const eT* const_row_iterator;

  inline row_iterator begin_row(const uword row_num);
  inline const_row_iterator begin_row(const uword row_num) const;

  inline row_iterator end_row(const uword row_num);
  inline const_row_iterator end_row(const uword row_num) const;

  template <uword fixed_n_elem>
  class fixed;

 protected:
  inline Row(const arma_fixed_indicator&, const uword in_n_elem, const eT* in_mem);

 public:
#if defined(ARMA_EXTRA_ROW_PROTO)
#include ARMA_INCFILE_WRAP(ARMA_EXTRA_ROW_PROTO)
#endif
};

template <typename eT>
template <uword fixed_n_elem>
class Row<eT>::fixed : public Row<eT> {
 private:
  using Mat<eT>::mem_local;

  static constexpr bool use_extra = (fixed_n_elem > arma_config::mat_prealloc);

  arma_align_mem eT mem_local_extra[(use_extra) ? fixed_n_elem : 1];

 public:
  typedef fixed<fixed_n_elem> Row_fixed_type;

  typedef eT elem_type;
  typedef typename get_pod_type<eT>::result pod_type;

  static constexpr bool is_col = false;
  static constexpr bool is_row = true;
  static constexpr bool is_xvec = false;

  static const uword n_rows;  // value provided below the class definition
  static const uword n_cols;  // value provided below the class definition
  static const uword n_elem;  // value provided below the class definition

  arma_inline fixed();
  arma_inline fixed(const fixed<fixed_n_elem>& X);
  inline fixed(const subview_cube<eT>& X);

  inline fixed(const fill::scalar_holder<eT> f);
  template <typename fill_type>
  inline fixed(const fill::fill_class<fill_type>& f);
  template <typename T1>
  inline fixed(const Base<eT, T1>& A);
  template <typename T1, typename T2>
  inline fixed(const Base<pod_type, T1>& A, const Base<pod_type, T2>& B);

  inline fixed(const eT* aux_mem);

  inline fixed(const char* text);
  inline fixed(const std::string& text);

  template <typename T1>
  inline Row& operator=(const Base<eT, T1>& A);

  inline Row& operator=(const eT val);
  inline Row& operator=(const char* text);
  inline Row& operator=(const std::string& text);
  inline Row& operator=(const subview_cube<eT>& X);

  using Row<eT>::operator();

  inline fixed(const std::initializer_list<eT>& list);
  inline Row& operator=(const std::initializer_list<eT>& list);

  arma_inline Row& operator=(const fixed<fixed_n_elem>& X);

#if defined(ARMA_GOOD_COMPILER)
  template <typename T1, typename eop_type>
  inline Row& operator=(const eOp<T1, eop_type>& X);
  template <typename T1, typename T2, typename eglue_type>
  inline Row& operator=(const eGlue<T1, T2, eglue_type>& X);
#endif

  arma_warn_unused arma_inline const Op<Row_fixed_type, op_htrans> t() const;
  arma_warn_unused arma_inline const Op<Row_fixed_type, op_htrans> ht() const;
  arma_warn_unused arma_inline const Op<Row_fixed_type, op_strans> st() const;

  arma_warn_unused arma_inline const eT& at_alt(const uword i) const;

  arma_warn_unused arma_inline eT& operator[](const uword i);
  arma_warn_unused arma_inline const eT& operator[](const uword i) const;
  arma_warn_unused arma_inline eT& at(const uword i);
  arma_warn_unused arma_inline const eT& at(const uword i) const;
  arma_warn_unused arma_inline eT& operator()(const uword i);
  arma_warn_unused arma_inline const eT& operator()(const uword i) const;

  arma_warn_unused arma_inline eT& at(const uword in_row, const uword in_col);
  arma_warn_unused arma_inline const eT& at(const uword in_row, const uword in_col) const;
  arma_warn_unused arma_inline eT& operator()(const uword in_row, const uword in_col);
  arma_warn_unused arma_inline const eT& operator()(const uword in_row,
                                                    const uword in_col) const;

  arma_warn_unused arma_inline eT* memptr();
  arma_warn_unused arma_inline const eT* memptr() const;

  inline const Row<eT>& fill(const eT val);
  inline const Row<eT>& zeros();
  inline const Row<eT>& ones();
};

// these definitions are outside of the class due to bizarre C++ rules;
// C++17 has inline variables to address this shortcoming

template <typename eT>
template <uword fixed_n_elem>
const uword Row<eT>::fixed<fixed_n_elem>::n_rows = 1u;

template <typename eT>
template <uword fixed_n_elem>
const uword Row<eT>::fixed<fixed_n_elem>::n_cols = fixed_n_elem;

template <typename eT>
template <uword fixed_n_elem>
const uword Row<eT>::fixed<fixed_n_elem>::n_elem = fixed_n_elem;

//! @}
