112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
/*
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* Copyright (c) 2023 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _TVG_INLIST_H_
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#define _TVG_INLIST_H_
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namespace tvg {
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//NOTE: declare this in your list item
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#define INLIST_ITEM(T) \
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T* prev; \
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T* next
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template<typename T>
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struct Inlist
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{
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T* head = nullptr;
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T* tail = nullptr;
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void free()
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{
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while (head) {
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auto t = head;
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head = t->next;
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delete(t);
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}
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head = tail = nullptr;
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}
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void back(T* element)
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{
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if (tail) {
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tail->next = element;
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element->prev = tail;
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element->next = nullptr;
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tail = element;
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} else {
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head = tail = element;
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element->prev = nullptr;
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element->next = nullptr;
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}
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}
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void front(T* element)
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{
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if (head) {
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head->prev = element;
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element->prev = nullptr;
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element->next = head;
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head = element;
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} else {
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head = tail = element;
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element->prev = nullptr;
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element->next = nullptr;
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}
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}
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T* back()
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{
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if (!tail) return nullptr;
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auto t = tail;
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tail = t->prev;
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if (!tail) head = nullptr;
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return t;
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}
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T* front()
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{
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if (!head) return nullptr;
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auto t = head;
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head = t->next;
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if (!head) tail = nullptr;
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return t;
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}
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void remove(T* element)
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{
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if (element->prev) element->prev->next = element->next;
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if (element->next) element->next->prev = element->prev;
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if (element == head) head = element->next;
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if (element == tail) tail = element->prev;
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}
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bool empty()
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{
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return head ? false : true;
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}
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};
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}
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#endif // _TVG_INLIST_H_
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