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/* $Id: shared_ptr.h $ */
/** @file
* Simplified shared pointer.
*/
/*
* Copyright (C) 2013-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#ifndef VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
#define VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#ifdef __cplusplus
template<typename T>
class SharedPtr
{
struct imp
{
imp(T *pTrg = NULL, int cnt = 1): ptr(pTrg),refcnt(cnt){}
~imp() { if (ptr) delete ptr;}
T *ptr;
int refcnt;
};
public:
SharedPtr(T *t = NULL):p(NULL)
{
p = new imp(t);
}
~SharedPtr()
{
p->refcnt--;
if (p->refcnt == 0)
delete p;
}
SharedPtr(const SharedPtr& rhs)
{
p = rhs.p;
p->refcnt++;
}
const SharedPtr& operator= (const SharedPtr& rhs)
{
if (p == rhs.p) return *this;
p->refcnt--;
if (p->refcnt == 0)
delete p;
p = rhs.p;
p->refcnt++;
return *this;
}
T *get() const
{
return p->ptr;
}
T *operator->()
{
return p->ptr;
}
const T*operator->() const
{
return p->ptr;
}
int use_count()
{
return p->refcnt;
}
private:
imp *p;
};
#endif
#endif /* !VBOX_INCLUDED_SRC_NetLib_shared_ptr_h */
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