110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
|
/*
|
||
|
|
Copyright (C) 2010, Michael Pruett. All rights reserved.
|
||
|
|
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
|
||
|
|
1. Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
|
||
|
|
2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
|
||
|
|
3. The name of the author may not be used to endorse or promote products
|
||
|
|
derived from this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
|
|
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
|
|
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||
|
|
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef SHARED_H
|
||
|
|
#define SHARED_H
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
class Shared
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
Shared() : m_refCount(0)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
void retain() { m_refCount++; }
|
||
|
|
void release() { if (--m_refCount == 0) delete static_cast<T *>(this); }
|
||
|
|
|
||
|
|
protected:
|
||
|
|
~Shared()
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
int m_refCount;
|
||
|
|
|
||
|
|
Shared(const Shared &);
|
||
|
|
Shared &operator =(const Shared &);
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
class SharedPtr
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
SharedPtr() : m_ptr(0)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
SharedPtr(T *ptr) : m_ptr(ptr)
|
||
|
|
{
|
||
|
|
if (m_ptr) m_ptr->retain();
|
||
|
|
}
|
||
|
|
SharedPtr(const SharedPtr &p) : m_ptr(p.m_ptr)
|
||
|
|
{
|
||
|
|
if (m_ptr) m_ptr->retain();
|
||
|
|
}
|
||
|
|
~SharedPtr()
|
||
|
|
{
|
||
|
|
if (T *p = m_ptr) p->release();
|
||
|
|
}
|
||
|
|
|
||
|
|
SharedPtr &operator =(T *ptr)
|
||
|
|
{
|
||
|
|
if (m_ptr != ptr)
|
||
|
|
{
|
||
|
|
if (ptr) ptr->retain();
|
||
|
|
if (m_ptr) m_ptr->release();
|
||
|
|
m_ptr = ptr;
|
||
|
|
}
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
SharedPtr &operator =(const SharedPtr &p)
|
||
|
|
{
|
||
|
|
if (m_ptr != p.m_ptr)
|
||
|
|
{
|
||
|
|
if (p.m_ptr) p.m_ptr->retain();
|
||
|
|
if (m_ptr) m_ptr->release();
|
||
|
|
m_ptr = p.m_ptr;
|
||
|
|
}
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
T *get() const { return m_ptr; }
|
||
|
|
T &operator *() const { return *m_ptr; }
|
||
|
|
T *operator ->() const { return m_ptr; }
|
||
|
|
|
||
|
|
typedef T *SharedPtr::*UnspecifiedBoolType;
|
||
|
|
operator UnspecifiedBoolType() const { return m_ptr ? &SharedPtr::m_ptr : 0; }
|
||
|
|
|
||
|
|
bool operator !() const { return !m_ptr; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
T *m_ptr;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|