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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 Index.h
* @ingroup COM_AI_RUNTIME
* @brief This file contains nnfw::misc::tensor::Index struct
*/
#ifndef __NNFW_MISC_TENSOR_INDEX_H__
#define __NNFW_MISC_TENSOR_INDEX_H__
#include <cstdint>
#include <cstddef>
#include <vector>
#include <initializer_list>
namespace nnfw
{
namespace misc
{
namespace tensor
{
/**
* @brief Struct to represent index of each dimension of a tensor
*/
struct Index
{
public:
/**
* @brief Construct a new @c Index object
* @param[in] rank Rank of a tensor
*/
Index(size_t rank) { _offsets.resize(rank); }
public:
/**
* @brief Construct a new @c Index object
* @param[in] offsets Rank of a tensor of @c std::initializer_list<int32_t> type
*/
Index(std::initializer_list<int32_t> offsets) : _offsets{offsets}
{
// DO NOTHING
}
public:
/**
* @brief Get the rank
* @return Rank that this @c Index object can handle
*/
size_t rank(void) const { return _offsets.size(); }
public:
/**
* @brief Get the index n'th dimension
* @param[in] n Dimension
* @return index of n'th dimension
*/
int32_t at(size_t n) const { return _offsets.at(n); }
/**
* @brief Get the reference of the index n'th dimension
* @param[in] n Dimension
* @return reference of index of n'th dimension
*/
int32_t &at(size_t n) { return _offsets.at(n); }
private:
std::vector<int32_t> _offsets;
};
/**
* @brief Copy an @c Index with reversed order
* @param[in] origin @c Index object to copy
* @return an @c Index object with reversed order
* @note This is used to convert NNAPI tensor index to ARM tensor index or vice versa
*/
inline static Index copy_reverse(const Index &origin)
{
size_t rank = origin.rank();
Index target(rank);
for (int i = 0; i < rank; i++)
target.at(i) = origin.at(rank - 1 - i);
return target;
}
} // namespace tensor
} // namespace misc
} // namespace nnfw
#endif // __NNFW_MISC_TENSOR_INDEX_H__
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