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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 Zipper.h
* @ingroup COM_AI_RUNTIME
* @brief This file contains nnfw::misc::tensor::Zipper class
*/
#ifndef __NNFW_MISC_TENSOR_ZIPPER_H__
#define __NNFW_MISC_TENSOR_ZIPPER_H__
#include "misc/tensor/Index.h"
#include "misc/tensor/IndexIterator.h"
#include "misc/tensor/Reader.h"
namespace nnfw
{
namespace misc
{
namespace tensor
{
/**
* @brief Class to apply a function with three params: @c Index, elements of a tensor
* at passed index read by @c Reader objects
*/
template <typename T> class Zipper
{
public:
/**
* @brief Construct a new @c Zipper object
* @param[in] shape Shape of @c lhs and @c rhs
* @param[in] lhs @c Reader object of a tensor
* @param[in] rhs @c Reader object of a tensor
*/
Zipper(const Shape &shape, const Reader<T> &lhs, const Reader<T> &rhs)
: _shape{shape}, _lhs{lhs}, _rhs{rhs}
{
// DO NOTHING
}
public:
/**
* @brief Apply @c cb to all elements of tensors. Elements of two tensors
* at passed @c index are read by @c lhs and @c rhs
* @param[in] cb Function to apply
* @return N/A
*/
template <typename Callable> void zip(Callable cb) const
{
iterate(_shape) <<
[this, &cb](const Index &index) { cb(index, _lhs.at(index), _rhs.at(index)); };
}
private:
const Shape &_shape;
const Reader<T> &_lhs;
const Reader<T> &_rhs;
};
/**
* @brief Apply @c cb by using @c lhs and @c rhs passed to the constructor of @c zipper
* @param[in] zipper @c Zipper object
* @param[in] cb Function to zpply using @c zip function
* @return @c zipper object after applying @c cb to @c zipper
*/
template <typename T, typename Callable>
const Zipper<T> &operator<<(const Zipper<T> &zipper, Callable cb)
{
zipper.zip(cb);
return zipper;
}
/**
* @brief Get @c Zipper object constructed using passed params
* @param shape Shape of @c lhs and @c rhs
* @param lhs @c Reader object of a tensor
* @param rhs @c Reader object of a tensor
* @return @c Zipper object
*/
template <typename T> Zipper<T> zip(const Shape &shape, const Reader<T> &lhs, const Reader<T> &rhs)
{
return Zipper<T>{shape, lhs, rhs};
}
} // namespace tensor
} // namespace misc
} // namespace nnfw
#endif // __NNFW_MISC_TENSOR_ZIPPER_H__
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