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/*
* SharedPtr.h
*
* Copyright (C) 2008 Johannes Thorn <dante@g4t3.de>
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef MAD_COMMON_SHAREDPTR_H_
#define MAD_COMMON_SHAREDPTR_H_
namespace Mad {
namespace Common {
template <typename T>
class SharedPtr {
protected:
class Counter {
public:
Counter(T *o) : object(o), refCount(1), cCount(new unsigned int(1)) {}
Counter(T *o, unsigned int *count) : object(o), refCount(1), cCount(count) {++*cCount;}
virtual ~Counter() {
if(--cCount)
return;
if(object)
delete object;
delete cCount;
}
T *object;
unsigned int refCount;
unsigned int *cCount;
};
Counter *counter;
template <typename T2>
class CastPtr : public SharedPtr<T2> {
public:
CastPtr(T *o, unsigned int *cCount) : SharedPtr<T2>(o, cCount) {}
};
SharedPtr(T *o, unsigned int *cCount) : counter(new Counter(o, cCount)) {}
public:
SharedPtr(T *o = 0) : counter(new Counter(o)) {}
SharedPtr(const SharedPtr<T> &c) : counter(c.counter) {
++counter->refCount;
}
virtual ~SharedPtr() {
if(--counter->refCount == 0)
delete counter;
}
SharedPtr<T>& operator=(const SharedPtr<T>& c) {
++c.counter->refCount;
if(--counter->refCount == 0)
delete counter;
counter = c.counter;
return *this;
}
bool empty() const {
return counter->object;
}
T* operator->() {return counter->object;}
T& operator*() {return *counter->object;}
const T* operator->() const {return counter->object;}
const T& operator*() const {return *counter->object;}
bool operator<(const SharedPtr<T> &o) const {return counter->object < o.counter->object;}
bool operator==(const SharedPtr<T> &o) const {return counter->object == o.counter->object;}
template <typename T2> SharedPtr<T2> cast() const {
return CastPtr<T2>(counter->object, counter->cCount);
}
};
}
}
#endif /*MAD_COMMON_SHAREDPTR_H_*/
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