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/*
This file is part of the DOM implementation for KDE.
Copyright (C) 2005, 2006 Apple Computer, Inc.
Copyright (C) 2002 Lars Knoll
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef SHARED_H
#define SHARED_H
namespace tdehtml {
template<class type> class Shared
{
public:
Shared() { _ref=0; /*counter++;*/ }
~Shared() { /*counter--;*/ }
void ref() { _ref++; }
void deref() {
if(_ref) _ref--;
if(!_ref)
delete static_cast<type *>(this);
}
bool hasOneRef() { //kdDebug(300) << "ref=" << _ref << endl;
return _ref==1; }
int refCount() const { return _ref; }
// static int counter;
protected:
unsigned int _ref;
};
template<class type> class TreeShared
{
public:
TreeShared() { _ref = 0; m_parent = 0; /*counter++;*/ }
TreeShared( type *parent ) { _ref=0; m_parent = parent; /*counter++;*/ }
~TreeShared() { /*counter--;*/ }
virtual void removedLastRef() { delete static_cast<type*>(this); }
void ref() { _ref++; }
void deref() {
if(_ref) _ref--;
if(!_ref && !m_parent) {
removedLastRef();
}
}
bool hasOneRef() { //kdDebug(300) << "ref=" << _ref << endl;
return _ref==1; }
int refCount() const { return _ref; }
// static int counter;
void setParent(type *parent) { m_parent = parent; }
type *parent() const { return m_parent; }
private:
unsigned int _ref;
protected:
type *m_parent;
};
template <class T> class SharedPtr;
template <class T> bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b);
template <class T> bool operator==(const SharedPtr<T> &a, const T *b);
template <class T> bool operator==(const T *a, const SharedPtr<T> &b);
template <class T> class SharedPtr
{
public:
SharedPtr() : m_ptr(0) {}
explicit SharedPtr(T *ptr) : m_ptr(ptr) { if (m_ptr) m_ptr->ref(); }
SharedPtr(const SharedPtr &o) : m_ptr(o.m_ptr) { if (m_ptr) m_ptr->ref(); }
~SharedPtr() { if (m_ptr) m_ptr->deref(); }
bool isNull() const { return m_ptr == 0; }
bool notNull() const { return m_ptr != 0; }
void reset() { if (m_ptr) m_ptr->deref(); m_ptr = 0; }
void reset(T *o) { if (o) o->ref(); if (m_ptr) m_ptr->deref(); m_ptr = o; }
T * get() const { return m_ptr; }
T &operator*() const { return *m_ptr; }
T *operator->() const { return m_ptr; }
bool operator!() const { return m_ptr == 0; }
template <class C> friend bool operator==(const SharedPtr<C> &a, const SharedPtr<C> &b);
template <class C> friend bool operator==(const SharedPtr<C> &a, const C *b);
template <class C> friend bool operator==(const C *a, const SharedPtr<C> &b);
SharedPtr &operator=(const SharedPtr &);
private:
T* m_ptr;
};
template <class T> SharedPtr<T> &SharedPtr<T>::operator=(const SharedPtr<T> &o)
{
if (o.m_ptr)
o.m_ptr->ref();
if (m_ptr)
m_ptr->deref();
m_ptr = o.m_ptr;
return *this;
}
template <class T> inline bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b) { return a.m_ptr == b.m_ptr; }
template <class T> inline bool operator==(const SharedPtr<T> &a, const T *b) { return a.m_ptr == b; }
template <class T> inline bool operator==(const T *a, const SharedPtr<T> &b) { return a == b.m_ptr; }
template <class T> inline bool operator!=(const SharedPtr<T> &a, const SharedPtr<T> &b) { return !(a==b); }
template <class T> inline bool operator!=(const SharedPtr<T> &a, const T *b) { return !(a == b); }
template <class T> inline bool operator!=(const T *a, const SharedPtr<T> &b) { return !(a == b); }
template <class T, class U> inline SharedPtr<T> static_pointer_cast(const SharedPtr<U> &p) { return SharedPtr<T>(static_cast<T *>(p.get())); }
template <class T, class U> inline SharedPtr<T> const_pointer_cast(const SharedPtr<U> &p) { return SharedPtr<T>(const_cast<T *>(p.get())); }
//A special pointer for nodes keeping track of the document,
//which helps distinguish back links from them to it, in order to break
//cycles
template <class T> class DocPtr {
public:
DocPtr() : m_ptr(0) {}
DocPtr(T *ptr) : m_ptr(ptr) { if (ptr) ptr->selfOnlyRef(); }
DocPtr(const DocPtr &o) : m_ptr(o.m_ptr) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }
~DocPtr() { if (T *ptr = m_ptr) ptr->selfOnlyDeref(); }
template <class U> DocPtr(const DocPtr<U> &o) : m_ptr(o.get()) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }
void resetSkippingRef(T *o) { m_ptr = o; }
T *get() const { return m_ptr; }
T &operator*() const { return *m_ptr; }
T *operator->() const { return m_ptr; }
bool operator!() const { return !m_ptr; }
// this type conversion operator allows implicit conversion to
// bool but not to other integer types
typedef T * (DocPtr::*UnspecifiedBoolType)() const;
operator UnspecifiedBoolType() const
{
return m_ptr ? &DocPtr::get : 0;
}
DocPtr &operator=(const DocPtr &);
DocPtr &operator=(T *);
private:
T *m_ptr;
};
template <class T> DocPtr<T> &DocPtr<T>::operator=(const DocPtr<T> &o)
{
T *optr = o.m_ptr;
if (optr)
optr->selfOnlyRef();
if (T *ptr = m_ptr)
ptr->selfOnlyDeref();
m_ptr = optr;
return *this;
}
template <class T> inline DocPtr<T> &DocPtr<T>::operator=(T *optr)
{
if (optr)
optr->selfOnlyRef();
if (T *ptr = m_ptr)
ptr->selfOnlyDeref();
m_ptr = optr;
return *this;
}
template <class T> inline bool operator==(const DocPtr<T> &a, const DocPtr<T> &b)
{
return a.get() == b.get();
}
template <class T> inline bool operator==(const DocPtr<T> &a, const T *b)
{
return a.get() == b;
}
template <class T> inline bool operator==(const T *a, const DocPtr<T> &b)
{
return a == b.get();
}
template <class T> inline bool operator!=(const DocPtr<T> &a, const DocPtr<T> &b)
{
return a.get() != b.get();
}
template <class T> inline bool operator!=(const DocPtr<T> &a, const T *b)
{
return a.get() != b;
}
template <class T> inline bool operator!=(const T *a, const DocPtr<T> &b)
{
return a != b.get();
}
} // namespace
#endif
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