Imported MaNGOS revision 6767 from http://mangos.svn.sourceforge.net/svnroot/mangos/trunk/

dep/src/zthread/IntrusivePtr.h

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTINTRUSIVEPTR_H__
+#define __ZTINTRUSIVEPTR_H__
+
+#include "zthread/Guard.h"
+#include <cstdlib>
+
+namespace ZThread {
+
+/**
+ * @class IntrusivePtr
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T17:54:23-0400>
+ * @version 2.2.0
+ *
+ * This template creates an intrusively reference counted object
+ * an IntrusivePtr starts out with a 1 count, which is updated as references are 
+ * added and removed. When the reference count drops to 0, the 
+ * IntrusivePtr will delete itself. 
+ */
+template <typename T, class LockType>
+class IntrusivePtr : NonCopyable {
+  
+  //! Intrusive reference count
+  size_t _count;
+  
+  //! Synchornization object
+  LockType _lock;
+
+public:
+
+  /**
+   * Create an IntrusivePtr with a count.
+   */
+  IntrusivePtr(size_t InitialCount=1) : _count(InitialCount) { }
+  
+  /**
+   * Destroy an IntrusivePtr
+   */
+  virtual ~IntrusivePtr() {}
+
+  /**
+   * Add a reference to this object, it will take one more
+   * call to delReference() for it to be deleted.
+   */
+  void addReference() {
+
+    Guard<LockType, LockedScope> g(_lock);
+    _count++;  
+
+  }
+
+  /**
+   * Remove a reference from this object, if the reference count
+   * drops to 0 as a result, the object deletes itself.
+   */
+  void delReference() {
+
+    bool result = false;
+
+    {
+
+      Guard<LockType, LockedScope> g(_lock);
+      result = (--_count == 0);
+
+    }
+
+    if(result)
+      delete this;
+
+  }
+
+};
+
+
+};
+
+#endif