--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/platform/Shared.h Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
+ *
+ * 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
+
+#include <wtf/Assertions.h>
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+template<class T> class Shared : Noncopyable {
+public:
+ Shared()
+ : m_refCount(0)
+#ifndef NDEBUG
+ , m_deletionHasBegun(false)
+#endif
+ {
+ }
+
+ void ref()
+ {
+ ASSERT(!m_deletionHasBegun);
+ ++m_refCount;
+ }
+
+ void deref()
+ {
+ ASSERT(!m_deletionHasBegun);
+ if (--m_refCount <= 0) {
+#ifndef NDEBUG
+ m_deletionHasBegun = true;
+#endif
+ delete static_cast<T*>(this);
+ }
+ }
+
+ bool hasOneRef()
+ {
+ ASSERT(!m_deletionHasBegun);
+ return m_refCount == 1;
+ }
+
+ int refCount() const
+ {
+ return m_refCount;
+ }
+
+private:
+ int m_refCount;
+#ifndef NDEBUG
+ bool m_deletionHasBegun;
+#endif
+};
+
+template<class T> class TreeShared : Noncopyable {
+public:
+ TreeShared()
+ : m_refCount(0)
+ , m_parent(0)
+ {
+#ifndef NDEBUG
+ m_deletionHasBegun = false;
+ m_inRemovedLastRefFunction = false;
+#endif
+ }
+ TreeShared(T* parent)
+ : m_refCount(0)
+ , m_parent(0)
+ {
+#ifndef NDEBUG
+ m_deletionHasBegun = false;
+ m_inRemovedLastRefFunction = false;
+#endif
+ }
+ virtual ~TreeShared()
+ {
+ ASSERT(m_deletionHasBegun);
+ }
+
+ void ref()
+ {
+ ASSERT(!m_deletionHasBegun);
+ ASSERT(!m_inRemovedLastRefFunction);
+ ++m_refCount;
+ }
+
+ void deref()
+ {
+ ASSERT(!m_deletionHasBegun);
+ ASSERT(!m_inRemovedLastRefFunction);
+ if (--m_refCount <= 0 && !m_parent) {
+#ifndef NDEBUG
+ m_inRemovedLastRefFunction = true;
+#endif
+ removedLastRef();
+ }
+ }
+
+ bool hasOneRef() const
+ {
+ ASSERT(!m_deletionHasBegun);
+ ASSERT(!m_inRemovedLastRefFunction);
+ return m_refCount == 1;
+ }
+
+ int refCount() const
+ {
+ return m_refCount;
+ }
+
+ void setParent(T* parent) { m_parent = parent; }
+ T* parent() const { return m_parent; }
+
+#ifndef NDEBUG
+ bool m_deletionHasBegun;
+ bool m_inRemovedLastRefFunction;
+#endif
+
+private:
+ virtual void removedLastRef()
+ {
+#ifndef NDEBUG
+ m_deletionHasBegun = true;
+#endif
+ delete this;
+ }
+
+ int m_refCount;
+ T* m_parent;
+};
+
+}
+
+#endif