* Moved Referenceable.cpp to src/kits/support (private libbe API), and its header to

private/shared.
* Made AddReference() and CountReferences() inlines.
* The registrar is now using the private Referenceable version in libbe.so.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21767 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/shared/AutoDeleter.h

@@ -1,35 +1,16 @@
-//------------------------------------------------------------------------------
-//	Copyright (c) 2001-2002, OpenBeOS
-//
-//	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.
-//
-//	File Name:		AutoDeleter.h
-//	Author(s):		Ingo Weinhold ([email protected])
-//	Description:	Scope-based automatic deletion of objects/arrays.
-//					ObjectDeleter - deletes an object
-//					ArrayDeleter  - deletes an array
-//					MemoryDeleter - free()s malloc()ed memory
-//------------------------------------------------------------------------------
-
+/*
+ * Copyright 2001-2007, Ingo Weinhold, [email protected]. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
 #ifndef _AUTO_DELETER_H
 #define _AUTO_DELETER_H
 
+/*!	Scope-based automatic deletion of objects/arrays.
+	ObjectDeleter - deletes an object
+	ArrayDeleter  - deletes an array
+	MemoryDeleter - free()s malloc()ed memory
+*/
+
 #include <stdlib.h>
 
 namespace BPrivate {

headers/private/shared/Referenceable.h

@@ -0,0 +1,122 @@
+/*
+ * Copyright 2004-2007, Ingo Weinhold, [email protected]. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _REFERENCEABLE_H
+#define _REFERENCEABLE_H
+
+
+#include <SupportDefs.h>
+
+
+namespace BPrivate {
+
+class Referenceable {
+public:
+								Referenceable(
+									bool deleteWhenUnreferenced = true);
+	virtual						~Referenceable();
+
+			void				AddReference()
+									{ atomic_add(&fReferenceCount, 1); }
+
+			bool				RemoveReference();	// returns true after last
+
+			int32				CountReferences() const
+									{ return fReferenceCount; }
+
+protected:
+			vint32				fReferenceCount;
+			bool				fDeleteWhenUnreferenced;
+};
+
+// Reference
+template<typename Type = BPrivate::Referenceable>
+class Reference {
+public:
+	Reference()
+		: fObject(NULL)
+	{
+	}
+
+	Reference(Type* object, bool alreadyHasReference = false)
+		: fObject(NULL)
+	{
+		SetTo(object, alreadyHasReference);
+	}
+
+	Reference(const Reference<Type>& other)
+		: fObject(NULL)
+	{
+		SetTo(other.fObject);
+	}
+
+	~Reference()
+	{
+		Unset();
+	}
+
+	void SetTo(Type* object, bool alreadyHasReference = false)
+	{
+		Unset();
+		fObject = object;
+		if (fObject && !alreadyHasReference)
+			fObject->AddReference();
+	}
+
+	void Unset()
+	{
+		if (fObject) {
+			fObject->RemoveReference();
+			fObject = NULL;
+		}
+	}
+
+	Type* Get() const
+	{
+		return fObject;
+	}
+
+	Type* Detach()
+	{
+		Type* object = fObject;
+		fObject = NULL;
+		return object;
+	}
+
+	Type& operator*() const
+	{
+		return *fObject;
+	}
+
+	Type* operator->() const
+	{
+		return fObject;
+	}
+
+	Reference& operator=(const Reference<Type>& other)
+	{
+		SetTo(other.fObject);
+		return *this;
+	}
+
+	bool operator==(const Reference<Type>& other) const
+	{
+		return (fObject == other.fObject);
+	}
+
+	bool operator!=(const Reference<Type>& other) const
+	{
+		return (fObject != other.fObject);
+	}
+
+private:
+	Type*	fObject;
+};
+
+}	// namespace BPrivate
+
+using BPrivate::Referenceable;
+using BPrivate::Reference;
+
+#endif	// _REFERENCEABLE_H