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/*
* Copyright (C) 2001-2006 Jacek Sieka, arnetheduck on gmail point com
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if !defined(POINTER_H)
#define POINTER_H
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "Thread.h"
class PointerBase
{
public:
void inc() throw() {
dcassert(ref>=0);
Thread::safeInc(ref);
}
void dec() throw() {
dcassert(ref>0);
if ( (Thread::safeDec(ref)) == 0 ) {
//dcdebug("Smart Object at 0x%08x deleted\n", this);
delete this;
}
}
bool unique() throw() {
return (ref == 1);
}
protected:
PointerBase() throw() : ref(0) { }
virtual ~PointerBase() throw() {
dcassert(!ref);
}
private:
volatile long ref;
};
/**
* Note; don't forget to make the destructor virtual if deriving from this class
*/
template <class T>
class Pointer
{
public:
Pointer ( PointerBase *aBase = 0) throw() : base(aBase) {
if ( base ) {
base->inc();
}
}
Pointer( const Pointer &rhs ) throw() : base(rhs.base) {
if ( base ) {
base->inc();
}
}
Pointer &operator =( const Pointer &rhs ) throw() {
if ( rhs.base ) {
rhs.base->inc();
}
if ( base ) {
base->dec();
}
base = rhs.base;
return *this;
}
Pointer &operator =( T* rhs ) throw() {
if (rhs) {
rhs->inc();
if ( base ) {
base->dec();
}
base = rhs;
}
return *this;
}
~Pointer() throw() {
if ( base ) {
base->dec();
}
}
T* operator->() { return asT(); }
T& operator* () { return *asT(); }
const T* operator->() const { return asT(); }
const T& operator* () const { return *asT(); }
operator bool() const { return base != NULL; }
bool operator==(T* rhs) const { return (T*)base == rhs; }
bool operator==(const Pointer& rhs) const { return base == rhs.base; }
bool operator!=(T* rhs) const { return (T*)base != rhs; }
bool operator!=(const Pointer& rhs) const { return base != rhs.base; }
bool operator<(T* rhs) const { return (T*)base < rhs; }
bool operator<(const Pointer& rhs) const { return base < rhs.base; }
bool operator>(T* rhs) const { return (T*)base > rhs; }
bool operator>(const Pointer& rhs) const { return base > rhs.base; }
static void swap ( Pointer &lhs, Pointer &rhs ) {
PointerBase *temp = lhs.base;
lhs.base = rhs.base;
rhs.base = temp;
}
void release() {
if ( base ) {
base->dec();
base = 0;
}
}
private:
PointerBase* base;
T* asT () {
dcassert(base);
return (T*)base;
}
const T* asT() const {
dcassert(base);
return (T*)base;
}
};
template <class T>
bool operator==(T* lhs, const Pointer<T>& rhs) { return rhs == lhs; }
template <class T>
bool operator<(T* lhs, const Pointer<T>& rhs) { return rhs > lhs; }
template <class T>
bool operator>(T* lhs, const Pointer<T>& rhs) { return rhs < lhs; }
struct DeleteFunction {
template<typename T>
void operator()(const T& p) const { delete p; }
};
#endif // !defined(POINTER_H)
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