/usr/include/spatialindex/tools/SmartPointer.h is in libspatialindex-dev 1.8.5-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Project: libspatialindex - A C++ library for spatial indexing
* Author: Marios Hadjieleftheriou, mhadji@gmail.com
******************************************************************************
* Copyright (c) 2004, Marios Hadjieleftheriou
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#pragma once
namespace Tools
{
template <class X> class SmartPointer
{
public:
explicit SmartPointer(X* p = 0) throw() : m_pointer(p) { m_prev = m_next = this; }
~SmartPointer() { release(); }
SmartPointer(const SmartPointer& p) throw() { acquire(p); }
SmartPointer& operator=(const SmartPointer& p)
{
if (this != &p)
{
release();
acquire(p);
}
return *this;
}
X& operator*() const throw() { return *m_pointer; }
X* operator->() const throw() { return m_pointer; }
X* get() const throw() { return m_pointer; }
bool unique() const throw() { return m_prev ? m_prev == this : true; }
private:
X* m_pointer;
mutable const SmartPointer* m_prev;
mutable const SmartPointer* m_next;
void acquire(const SmartPointer& p) throw()
{
m_pointer = p.m_pointer;
m_next = p.m_next;
m_next->m_prev = this;
m_prev = &p;
#ifndef mutable
p.m_next = this;
#else
(const_cast<linked_ptr<X>*>(&p))->m_next = this;
#endif
}
void release()
{
if (unique()) delete m_pointer;
else
{
m_prev->m_next = m_next;
m_next->m_prev = m_prev;
m_prev = m_next = 0;
}
m_pointer = 0;
}
};
}
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