Georgios Pinitas | d8734b5 | 2017-12-22 15:27:52 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018 ARM Limited. |
| 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | #ifndef __ARM_COMPUTE_MISC_ITERABLE_H__ |
| 25 | #define __ARM_COMPUTE_MISC_ITERABLE_H__ |
| 26 | |
| 27 | #include <iterator> |
| 28 | |
| 29 | namespace arm_compute |
| 30 | { |
| 31 | namespace utils |
| 32 | { |
| 33 | namespace iterable |
| 34 | { |
| 35 | /** Reverse range iterable class |
| 36 | * |
| 37 | * @tparam T Type to create a reverse range on |
| 38 | */ |
| 39 | template <typename T> |
| 40 | class reverse_iterable |
| 41 | { |
| 42 | public: |
| 43 | /** Default constructor |
| 44 | * |
| 45 | * @param[in] it Value to reverse iterate on |
| 46 | */ |
| 47 | explicit reverse_iterable(T &it) |
| 48 | : _it(it) |
| 49 | { |
| 50 | } |
| 51 | |
Alex Gilday | c357c47 | 2018-03-21 13:54:09 +0000 | [diff] [blame] | 52 | /** Get beginning of iterator. |
| 53 | * |
| 54 | * @return beginning of iterator. |
| 55 | */ |
Georgios Pinitas | d8734b5 | 2017-12-22 15:27:52 +0000 | [diff] [blame] | 56 | typename T::reverse_iterator begin() |
| 57 | { |
| 58 | return _it.rbegin(); |
| 59 | } |
| 60 | |
Alex Gilday | c357c47 | 2018-03-21 13:54:09 +0000 | [diff] [blame] | 61 | /** Get end of iterator. |
| 62 | * |
| 63 | * @return end of iterator. |
| 64 | */ |
Georgios Pinitas | d8734b5 | 2017-12-22 15:27:52 +0000 | [diff] [blame] | 65 | typename T::reverse_iterator end() |
| 66 | { |
| 67 | return _it.rend(); |
| 68 | } |
| 69 | |
Alex Gilday | c357c47 | 2018-03-21 13:54:09 +0000 | [diff] [blame] | 70 | /** Get beginning of const iterator. |
| 71 | * |
| 72 | * @return beginning of const iterator. |
| 73 | */ |
Georgios Pinitas | d8734b5 | 2017-12-22 15:27:52 +0000 | [diff] [blame] | 74 | typename T::const_reverse_iterator cbegin() |
| 75 | { |
| 76 | return _it.rbegin(); |
| 77 | } |
| 78 | |
Alex Gilday | c357c47 | 2018-03-21 13:54:09 +0000 | [diff] [blame] | 79 | /** Get end of const iterator. |
| 80 | * |
| 81 | * @return end of const iterator. |
| 82 | */ |
Georgios Pinitas | d8734b5 | 2017-12-22 15:27:52 +0000 | [diff] [blame] | 83 | typename T::const_reverse_iterator cend() |
| 84 | { |
| 85 | return _it.rend(); |
| 86 | } |
| 87 | |
| 88 | private: |
| 89 | T &_it; |
| 90 | }; |
| 91 | |
| 92 | /** Creates a reverse iterable for a given type |
| 93 | * |
| 94 | * @tparam T Type to create a reverse iterable on |
| 95 | * |
| 96 | * @param[in] val Iterable input |
| 97 | * |
| 98 | * @return Reverse iterable container |
| 99 | */ |
| 100 | template <typename T> |
| 101 | reverse_iterable<T> reverse_iterate(T &val) |
| 102 | { |
| 103 | return reverse_iterable<T>(val); |
| 104 | } |
| 105 | } // namespace iterable |
| 106 | } // namespace utils |
| 107 | } // namespace arm_compute |
| 108 | #endif /* __ARM_COMPUTE_MISC_ITERABLE_H__ */ |