mirror of
https://github.com/MCLx86/xtreemtest.git
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103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
/******************************************************************************
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* Project: libspatialindex - A C++ library for spatial indexing
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* Author: Marios Hadjieleftheriou, mhadji@gmail.com
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******************************************************************************
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* Copyright (c) 2004, Marios Hadjieleftheriou
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR 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
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* THE 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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******************************************************************************/
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#pragma once
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#include "PointerPool.h"
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namespace Tools
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{
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template <class X> class PointerPool;
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template <class X> class PoolPointer
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{
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public:
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explicit PoolPointer(X* p = 0) : m_pointer(p), m_pPool(0) { m_prev = m_next = this; }
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explicit PoolPointer(X* p, PointerPool<X>* pPool) throw() : m_pointer(p), m_pPool(pPool) { m_prev = m_next = this; }
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~PoolPointer() { release(); }
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PoolPointer(const PoolPointer& p) throw() { acquire(p); }
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PoolPointer& operator=(const PoolPointer& p)
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{
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if (this != &p)
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{
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release();
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acquire(p);
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}
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return *this;
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}
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X& operator*() const throw() { return *m_pointer; }
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X* operator->() const throw() { return m_pointer; }
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X* get() const throw() { return m_pointer; }
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bool unique() const throw() { return m_prev ? m_prev == this : true; }
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void relinquish() throw()
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{
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m_pPool = 0;
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m_pointer = 0;
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release();
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}
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private:
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X* m_pointer;
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mutable const PoolPointer* m_prev;
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mutable const PoolPointer* m_next;
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PointerPool<X>* m_pPool;
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void acquire(const PoolPointer& p) throw()
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{
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m_pPool = p.m_pPool;
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m_pointer = p.m_pointer;
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m_next = p.m_next;
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m_next->m_prev = this;
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m_prev = &p;
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#ifndef mutable
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p.m_next = this;
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#else
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(const_cast<linked_ptr<X>*>(&p))->m_next = this;
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#endif
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}
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void release()
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{
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if (unique())
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{
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if (m_pPool != 0) m_pPool->release(m_pointer);
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else delete m_pointer;
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}
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else
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{
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m_prev->m_next = m_next;
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m_next->m_prev = m_prev;
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m_prev = m_next = 0;
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}
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m_pointer = 0;
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m_pPool = 0;
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}
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};
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}
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