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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.
*/
/**
* @file IndexIterator.h
* @ingroup COM_AI_RUNTIME
* @brief This file contains nnfw::misc::tensor::IndexIterator class and
* helper function and operator
*/
#ifndef __NNFW_MISC_TENSOR_INDEX_ITERATOR_H__
#define __NNFW_MISC_TENSOR_INDEX_ITERATOR_H__
#include "misc/tensor/Shape.h"
#include "misc/tensor/Index.h"
#include "misc/tensor/IndexEnumerator.h"
namespace nnfw
{
namespace misc
{
namespace tensor
{
/**
* @brief Class to iterate indexes available for given shape
*/
class IndexIterator
{
public:
/**
* @brief Construct a new @c IndexIterator object
* @param[in] shape Shape of tensor of which index will be iterated
*/
IndexIterator(const Shape &shape) : _shape(shape)
{
// DO NOTHING
}
public:
/**
* @brief Construct a new IndexIterator object using reference
* @param[in] IndexIterator @c IndexIterator object to move
*/
IndexIterator(IndexIterator &&) = default;
/**
* @brief Prevent copy constructor
*/
IndexIterator(const IndexIterator &) = delete;
public:
/**
* @brief Iterate all available indexes and run a function for each index
* @param[in] fn Function that requires an index as a parameter.
* @return @c IndexIterator object
*/
template <typename Callable> IndexIterator &iter(Callable fn)
{
for (IndexEnumerator e{_shape}; e.valid(); e.advance())
{
fn(e.curr());
}
return (*this);
}
private:
const Shape &_shape;
};
/**
* @brief Get an @c IndexItator object
* @param[in] shape Shape of tensor of which index will be iterated
* @return @c IndexIterator object
*/
inline IndexIterator iterate(const Shape &shape) { return IndexIterator{shape}; }
/**
* @brief Iterate all indexes and apply a function
* @param[in] it @c IndexIterator object that is constructed with a tensor shape
* @param[in] cb A function that will receive a specific index.
* Inside the function, the index is used to manipulate tensor element.
* @return @c IndexIterator object
*/
template <typename Callable> IndexIterator &operator<<(IndexIterator &&it, Callable cb)
{
return it.iter(cb);
}
} // namespace tensor
} // namespace misc
} // namespace nnfw
#endif // __NNFW_MISC_TENSOR_INDEX_ITERATOR_H__
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