5 * Copyright (c) 2018 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>
34 * FreeList operates by connecting unused elements of a vector together in a linked list using the
35 * value of each unused cell as a pointer to the next. When a new element is added, it will be added
36 * to the first free index of the vector and the new free index will be the value which was on that
56 * Adds a new item to the list. If there is no more space in the vector it will
57 * allocate more space, otherwise, it will use the first free cell to store the
58 * new value and will update the first free index.
60 * @param[in] value The value to add
61 * @return The index where the value has been added
63 uint32_t Add( uint32_t value )
65 const uint32_t size = static_cast<uint32_t>( mData.Size() ); // 4,294,967,295 entries is enough
66 if( mData.Empty() || mFirstFreeIndex == size )
68 //Make room for another item
69 mData.PushBack( size + 1 );
70 mFirstFreeIndex = size;
73 //Update first free index
74 uint32_t index = mFirstFreeIndex;
75 mFirstFreeIndex = mData[mFirstFreeIndex];
82 * Removes the item at position "index" from the list and
83 * updates the first free index
85 * @param[in] index The index of the element to remove
87 void Remove( uint32_t index )
89 mData[index] = mFirstFreeIndex;
90 mFirstFreeIndex = index;
96 * @param[in] index Index of the element.
97 * @return Reference to the element for given index.
99 uint32_t& operator[]( uint32_t index )
105 * Subscript operator (const).
107 * @param[in] index Index of the element.
108 * @return Reference to the element for given index.
110 uint32_t operator[]( uint32_t index ) const
116 Dali::Vector< uint32_t > mData; ///< data
117 uint32_t mFirstFreeIndex; ///< Index where a new element will be added
123 #endif /* FREE_LIST_H_ */