Éanna Ó Catháin | c6ab02a | 2021-04-07 14:35:25 +0100 | [diff] [blame] | 1 | // |
| 2 | // Copyright © 2020 Arm Ltd and Contributors. All rights reserved. |
| 3 | // SPDX-License-Identifier: MIT |
| 4 | // |
| 5 | #pragma once |
| 6 | |
| 7 | #include <stdio.h> |
| 8 | #include <iterator> |
| 9 | |
| 10 | /** |
| 11 | * Class Array2d is a data structure that represents a two dimensional array. |
| 12 | * The data is allocated in contiguous memory, arranged row-wise |
| 13 | * and individual elements can be accessed with the () operator. |
| 14 | * For example a two dimensional array D of size (M, N) can be accessed: |
| 15 | * |
| 16 | * _|<------------- col size = N -------->| |
| 17 | * | D(r=0, c=0) D(r=0, c=1)... D(r=0, c=N) |
| 18 | * | D(r=1, c=0) D(r=1, c=1)... D(r=1, c=N) |
| 19 | * | ... |
| 20 | * row size = M ... |
| 21 | * | ... |
| 22 | * _ D(r=M, c=0) D(r=M, c=1)... D(r=M, c=N) |
| 23 | * |
| 24 | */ |
| 25 | template<typename T> |
| 26 | class Array2d |
| 27 | { |
| 28 | private: |
| 29 | size_t m_rows; |
| 30 | size_t m_cols; |
| 31 | T* m_data; |
| 32 | |
| 33 | public: |
| 34 | /** |
| 35 | * Creates the array2d with the given sizes. |
| 36 | * |
| 37 | * @param rows number of rows. |
| 38 | * @param cols number of columns. |
| 39 | */ |
| 40 | Array2d(unsigned rows, unsigned cols) |
| 41 | { |
| 42 | if (rows == 0 || cols == 0) { |
| 43 | printf("Array2d constructor has 0 size.\n"); |
| 44 | m_data = nullptr; |
| 45 | return; |
| 46 | } |
| 47 | m_rows = rows; |
| 48 | m_cols = cols; |
| 49 | m_data = new T[rows * cols]; |
| 50 | } |
| 51 | |
| 52 | ~Array2d() |
| 53 | { |
| 54 | delete[] m_data; |
| 55 | } |
| 56 | |
| 57 | T& operator() (unsigned int row, unsigned int col) |
| 58 | { |
| 59 | return m_data[m_cols * row + col]; |
| 60 | } |
| 61 | |
| 62 | T operator() (unsigned int row, unsigned int col) const |
| 63 | { |
| 64 | return m_data[m_cols * row + col]; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Gets rows number of the current array2d. |
| 69 | * @return number of rows. |
| 70 | */ |
| 71 | size_t size(size_t dim) |
| 72 | { |
| 73 | switch (dim) |
| 74 | { |
| 75 | case 0: |
| 76 | return m_rows; |
| 77 | case 1: |
| 78 | return m_cols; |
| 79 | default: |
| 80 | return 0; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Gets the array2d total size. |
| 86 | */ |
| 87 | size_t totalSize() |
| 88 | { |
| 89 | return m_rows * m_cols; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * array2d iterator. |
| 94 | */ |
| 95 | using iterator=T*; |
| 96 | using const_iterator=T const*; |
| 97 | |
| 98 | iterator begin() { return m_data; } |
| 99 | iterator end() { return m_data + totalSize(); } |
| 100 | const_iterator begin() const { return m_data; } |
| 101 | const_iterator end() const { return m_data + totalSize(); }; |
| 102 | }; |