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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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifndef SHARED_H
+#define SHARED_H
+
+namespace khtml {
+
+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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