73 lines
2 KiB
C++
73 lines
2 KiB
C++
/*
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Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans https://bulletphysics.org
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef BT_GEN_LIST_H
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#define BT_GEN_LIST_H
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class btGEN_Link
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{
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public:
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btGEN_Link() : m_next(0), m_prev(0) {}
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btGEN_Link(btGEN_Link *next, btGEN_Link *prev) : m_next(next), m_prev(prev) {}
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btGEN_Link *getNext() const { return m_next; }
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btGEN_Link *getPrev() const { return m_prev; }
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bool isHead() const { return m_prev == 0; }
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bool isTail() const { return m_next == 0; }
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void insertBefore(btGEN_Link *link)
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{
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m_next = link;
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m_prev = link->m_prev;
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m_next->m_prev = this;
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m_prev->m_next = this;
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}
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void insertAfter(btGEN_Link *link)
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{
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m_next = link->m_next;
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m_prev = link;
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m_next->m_prev = this;
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m_prev->m_next = this;
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}
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void remove()
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{
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m_next->m_prev = m_prev;
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m_prev->m_next = m_next;
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}
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private:
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btGEN_Link *m_next;
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btGEN_Link *m_prev;
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};
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class btGEN_List
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{
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public:
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btGEN_List() : m_head(&m_tail, 0), m_tail(0, &m_head) {}
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btGEN_Link *getHead() const { return m_head.getNext(); }
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btGEN_Link *getTail() const { return m_tail.getPrev(); }
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void addHead(btGEN_Link *link) { link->insertAfter(&m_head); }
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void addTail(btGEN_Link *link) { link->insertBefore(&m_tail); }
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private:
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btGEN_Link m_head;
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btGEN_Link m_tail;
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};
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#endif //BT_GEN_LIST_H
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