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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* 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 DATA_STRUCTURES_HPP
#define DATA_STRUCTURES_HPP
#include "hal.h"
#include <iterator>
namespace arm {
namespace app {
/**
* Class Array2d is a data structure that represents a two dimensional array.
* The data is allocated in contiguous memory, arranged row-wise
* and individual elements can be accessed with the () operator.
* For example a two dimensional array D of size (M, N) can be accessed:
*
* _|<------------- col size = N -------->|
* | D(r=0, c=0) D(r=0, c=1)... D(r=0, c=N)
* | D(r=1, c=0) D(r=1, c=1)... D(r=1, c=N)
* | ...
* row size = M ...
* | ...
* _ D(r=M, c=0) D(r=M, c=1)... D(r=M, c=N)
*
*/
template<typename T>
class Array2d {
public:
/**
* @brief Creates the array2d with the given sizes.
* @param[in] rows Number of rows.
* @param[in] cols Number of columns.
*/
Array2d(unsigned rows, unsigned cols)
{
if (rows == 0 || cols == 0) {
printf_err("Array2d constructor has 0 size.\n");
_m_data = nullptr;
return;
}
_m_rows = rows;
_m_cols = cols;
_m_data = new T[rows * cols];
}
~Array2d()
{
delete[] _m_data;
}
T& operator() (unsigned int row, unsigned int col)
{
#if defined(DEBUG)
if (row >= _m_rows || col >= _m_cols || _m_data == nullptr) {
printf_err("Array2d subscript out of bounds.\n");
}
#endif /* defined(DEBUG) */
return _m_data[_m_cols * row + col];
}
T operator() (unsigned int row, unsigned int col) const
{
#if defined(DEBUG)
if (row >= _m_rows || col >= _m_cols || _m_data == nullptr) {
printf_err("const Array2d subscript out of bounds.\n");
}
#endif /* defined(DEBUG) */
return _m_data[_m_cols * row + col];
}
/**
* @brief Gets rows number of the current array2d.
* @return Number of rows.
*/
size_t size(size_t dim)
{
switch (dim)
{
case 0:
return _m_rows;
case 1:
return _m_cols;
default:
return 0;
}
}
/**
* @brief Gets the array2d total size.
*/
size_t totalSize()
{
return _m_rows * _m_cols;
}
/**
* array2d iterator.
*/
using iterator=T*;
using const_iterator=T const*;
iterator begin() { return _m_data; }
iterator end() { return _m_data + totalSize(); }
const_iterator begin() const { return _m_data; }
const_iterator end() const { return _m_data + totalSize(); };
private:
size_t _m_rows;
size_t _m_cols;
T* _m_data;
};
} /* namespace app */
} /* namespace arm */
#endif /* DATA_STRUCTURES_HPP */
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