1 #ifndef DALI_FREE_LIST_H
2 #define DALI_FREE_LIST_H
5 * Copyright (c) 2022 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <cstdint> // uint32_t
25 #include <dali/public-api/common/dali-vector.h>
30 * @brief FreeList operates by connecting unused elements of a vector together in a linked list using the
31 * value of each unused cell as a pointer to the next. When a new element is added, it will be added
32 * to the first free index of the vector and the new free index will be the value which was on that
49 ~FreeList() = default;
52 * @brief Adds a new item to the list. If there is no more space in the vector it will
53 * allocate more space, otherwise, it will use the first free cell to store the
54 * new value and will update the first free index.
56 * @param[in] value The value to add
57 * @return The index where the value has been added
59 uint32_t Add(uint32_t value)
61 const uint32_t size = static_cast<uint32_t>(mData.Size()); // 4,294,967,295 entries is enough
62 if(mData.Empty() || mFirstFreeIndex == size)
64 //Make room for another item
65 mData.PushBack(size + 1);
66 mFirstFreeIndex = size;
69 //Update first free index
70 uint32_t index = mFirstFreeIndex;
71 mFirstFreeIndex = mData[mFirstFreeIndex];
78 * @brief Removes the item at position "index" from the list and
79 * updates the first free index
81 * @param[in] index The index of the element to remove
83 void Remove(uint32_t index)
85 mData[index] = mFirstFreeIndex;
86 mFirstFreeIndex = index;
90 * @brief Subscript operator.
92 * @param[in] index Index of the element.
93 * @return Reference to the element for given index.
95 uint32_t& operator[](uint32_t index)
101 * @brief Subscript operator (const).
103 * @param[in] index Index of the element.
104 * @return Reference to the element for given index.
106 uint32_t operator[](uint32_t index) const
112 Dali::Vector<uint32_t> mData; ///< data
113 uint32_t mFirstFreeIndex; ///< Index where a new element will be added
118 #endif /* DALI_FREE_LIST_H */