IndexIterator.h

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/*
 * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * 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.
 */
 
#ifndef __NNFW_MISC_KERNEL_INDEX_ITERATOR_H__
#define __NNFW_MISC_KERNEL_INDEX_ITERATOR_H__
 
#include "misc/kernel/Shape.h"
 
namespace nnfw
{
namespace misc
{
namespace kernel
{
 
class IndexIterator
{
public:
  IndexIterator(const Shape &shape) : _shape{shape}
  {
    // DO NOTHING
  }
 
public:
  template <typename Callable> IndexIterator &iter(Callable cb)
  {
    for (int32_t nth = 0; nth < _shape.N; ++nth)
    {
      for (int32_t ch = 0; ch < _shape.C; ++ch)
      {
        for (int32_t row = 0; row < _shape.H; ++row)
        {
          for (int32_t col = 0; col < _shape.W; ++col)
          {
            cb(nth, ch, row, col);
          }
        }
      }
    }
 
    return (*this);
  }
 
private:
  const Shape _shape; 
};
 
inline IndexIterator iterate(const Shape &shape) { return IndexIterator{shape}; }
 
template <typename Callable> IndexIterator &operator<<(IndexIterator &&it, Callable cb)
{
  return it.iter(cb);
}
 
} // namespace kernel
} // namespace misc
} // namespace nnfw
 
#endif // __NNFW_MISC_FEATURE_INDEX_ITERATOR_H__