mirror of
https://github.com/nzp-team/vhlt.git
synced 2024-11-25 05:11:28 +00:00
155 lines
3.6 KiB
C++
155 lines
3.6 KiB
C++
// Copyright (C) 2000 Sean Cavanaugh
|
|
// This file is licensed under the terms of the Lesser GNU Public License
|
|
// (see LPGL.txt, or http://www.gnu.org/copyleft/lesser.txt)
|
|
|
|
#if !defined(AFX_ReferencePtr_H__BAEBCE9D_CD68_40AF_8A54_B23A0D14E807__INCLUDED_)
|
|
#define AFX_ReferencePtr_H__BAEBCE9D_CD68_40AF_8A54_B23A0D14E807__INCLUDED_
|
|
|
|
#if _MSC_VER > 1000
|
|
#pragma once
|
|
#endif // _MSC_VER > 1000
|
|
|
|
#ifdef WIN32
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include "windows.h"
|
|
#endif
|
|
#include "assert.h"
|
|
#include "limits.h"
|
|
|
|
#ifdef SYSTEM_POSIX
|
|
#ifdef HAVE_STDDEF_H
|
|
// For NULL
|
|
#include <stddef.h>
|
|
#endif
|
|
#endif
|
|
|
|
#include "ReferenceCounter.h"
|
|
|
|
/*!
|
|
\author Sean Cavanaugh
|
|
\email sean@dimensionalrift.com
|
|
\cvsauthor $Author: sean $
|
|
\date $Date: 2000/09/11 20:28:24 $
|
|
\version $Revision: 1.1 $
|
|
\brief ReferencePtr is a simplified ReferencePtr, primiarily for use with reference counted pointers.
|
|
Its purpose is solely for simplified garbage collection, and not any kind of advanced
|
|
copy on write functionality. Passing a normal pointer to this class effectively starts
|
|
its reference count at one and should not be manually deleted. (But it may be referenced
|
|
as long as you know the object still exists in some scope somewhere)
|
|
*/
|
|
template<class DATA_T>
|
|
class ReferencePtrBlock
|
|
{
|
|
public:
|
|
DATA_T* pData; // User defined data block
|
|
mutable ReferenceCounter ReferenceCount;
|
|
};
|
|
|
|
|
|
template<class DATA_T>
|
|
class ReferencePtr
|
|
{
|
|
public:
|
|
// Construction
|
|
ReferencePtr();
|
|
ReferencePtr(DATA_T* other);
|
|
ReferencePtr(const ReferencePtr<DATA_T>& other);
|
|
virtual ~ReferencePtr();
|
|
|
|
// Assignment
|
|
ReferencePtr<DATA_T>& operator=(const ReferencePtr<DATA_T>& other);
|
|
ReferencePtr<DATA_T>& operator=(DATA_T* other);
|
|
|
|
// Dereferencing
|
|
operator DATA_T*() const {return m_pData->pData;}
|
|
DATA_T* operator->() const {return m_pData->pData;}
|
|
|
|
protected:
|
|
// Internal methods
|
|
void Alloc(); // Allocate the m_pData
|
|
void Release(); // Releases a reference count (possibly freeing memory)
|
|
|
|
protected:
|
|
// Member data
|
|
ReferencePtrBlock<DATA_T>* m_pData;
|
|
};
|
|
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>::ReferencePtr()
|
|
{
|
|
Alloc();
|
|
}
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>::ReferencePtr(DATA_T* other)
|
|
{
|
|
Alloc();
|
|
m_pData->pData = other;
|
|
m_pData->ReferenceCount = 1;
|
|
}
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>::ReferencePtr(const ReferencePtr<DATA_T>& other)
|
|
{
|
|
m_pData = other.m_pData;
|
|
m_pData->ReferenceCount++;
|
|
}
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>::~ReferencePtr()
|
|
{
|
|
Release();
|
|
}
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>& ReferencePtr<DATA_T>::operator=(const ReferencePtr<DATA_T>& other)
|
|
{
|
|
if (m_pData != other.m_pData)
|
|
{
|
|
Release();
|
|
m_pData = other.m_pData;
|
|
m_pData->ReferenceCount++;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
template<class DATA_T>
|
|
ReferencePtr<DATA_T>& ReferencePtr<DATA_T>::operator=(DATA_T* other)
|
|
{
|
|
if (m_pData->ReferenceCount.dec() <= 0)
|
|
{
|
|
delete m_pData->pData;
|
|
m_pData->pData = other;
|
|
m_pData->ReferenceCount = 1;
|
|
}
|
|
else
|
|
{
|
|
Alloc();
|
|
m_pData->pData = other;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
template<class DATA_T>
|
|
void ReferencePtr<DATA_T>::Alloc()
|
|
{
|
|
m_pData = new ReferencePtrBlock<DATA_T>;
|
|
m_pData->ReferenceCount = 1;
|
|
m_pData->pData = NULL;
|
|
}
|
|
|
|
template<class DATA_T>
|
|
void ReferencePtr<DATA_T>::Release()
|
|
{
|
|
assert(m_pData != NULL);
|
|
if (m_pData->ReferenceCount.dec() <= 0)
|
|
{
|
|
delete m_pData->pData;
|
|
m_pData->pData = NULL;
|
|
delete m_pData;
|
|
m_pData = NULL;
|
|
}
|
|
}
|
|
|
|
#endif // !defined(AFX_ReferencePtr_H__BAEBCE9D_CD68_40AF_8A54_B23A0D14E807__INCLUDED_)
|