// 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_row_as_mat
//! @{

template <typename T1>
inline void op_row_as_mat::apply(Mat<typename T1::elem_type>& out,
                                 const CubeToMatOp<T1, op_row_as_mat>& expr) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  const unwrap_cube<T1> U(expr.m);
  const Cube<eT>& A = U.M;

  const uword in_row = expr.aux_uword;

  arma_conform_check_bounds((in_row >= A.n_rows),
                            "Cube::row_as_mat(): index out of bounds");

  const uword A_n_cols = A.n_cols;
  const uword A_n_rows = A.n_rows;
  const uword A_n_slices = A.n_slices;

  out.set_size(A_n_slices, A_n_cols);

  for (uword s = 0; s < A_n_slices; ++s) {
    const eT* A_mem = &(A.at(in_row, 0, s));
    eT* out_mem = &(out.at(s, 0));

    for (uword c = 0; c < A_n_cols; ++c) {
      (*out_mem) = (*A_mem);

      A_mem += A_n_rows;
      out_mem += A_n_slices;
    }
  }
}

//! @}
