--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/inc/glxid.h Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,101 @@
+/*
+* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: Type-safe unique id template
+*
+*/
+
+
+
+
+#ifndef T_GLXID_H
+#define T_GLXID_H
+
+#include "e32std.h"
+#include "glxpanic.h"
+
+/** Invalid or undefined id value */
+// Use "id == KGlxIdNone" and "id != KGlxIdNone" to check for
+// id validity.
+class TGlxIdNone {};
+const TGlxIdNone KGlxIdNone = TGlxIdNone();
+
+/**
+ * TGlxId
+ *
+ * Type-safe template for ids
+ * Id value of KMaxTUint is consided to be undefined.
+ * @usage Define like this:
+ * class TMyIdBase {};
+ * typedef TGlxId<TMyIdBase> TMyId;
+ * Now use can use TMyId in other code
+ */
+template <class T>
+class TGlxId : public T {
+public:
+ inline TGlxId();
+ inline TGlxId(const TGlxId<T>& aId);
+ inline TGlxId(TUint aIdValue);
+ inline TGlxId(const TGlxIdNone&);
+ inline TGlxId<T>& operator=(const TGlxId<T>& aId);
+ inline TGlxId<T>& operator=(TUint aIdValue);
+
+ inline TGlxId<T>& operator=(const TGlxIdNone&);
+ inline TGlxId<T> operator++(int); // Postfix, keep dummy parameter as int
+ inline TBool operator!=(const TGlxId<T>& aId) const;
+ inline TBool operator==(const TGlxId<T>& aId) const;
+ inline TBool operator!=(const TGlxIdNone&) const;
+ inline TBool operator==(const TGlxIdNone&) const;
+ inline TBool operator>(const TGlxId<T>& aId) const;
+ inline TBool operator<(const TGlxId<T>& aId) const;
+
+ inline TUint Value() const;
+ inline void SetValue(TUint aIdValue); // Allows setting undefined as value (KMaxTUint)
+
+private:
+ TUint iIdValue;
+};
+
+/**
+ * MGlxIdProvider
+ * Abstract interface class to provide ids
+ * Define as MGlxIdProvider<TMyId>
+ */
+template <class T>
+class MGlxIdProvider {
+public:
+ /**
+ * getNextId
+ * Returns the next unique id.
+ * Returns value in the argument, since otherwise cannot have the same
+ * deriving class provide multiple different types of ids
+ */
+ virtual void NextId(T& aId) = 0;
+};
+
+/**
+ * TGlxDefaultIdProvider
+ * Simple implementation of id provider
+ */
+template <class T>
+class TGlxDefaultIdProvider : public MGlxIdProvider<T> {
+private:
+ TUint iNextIdValue;
+public:
+ inline TGlxDefaultIdProvider();
+ virtual void NextId(T& aId);
+};
+
+#include "glxid.inl"
+
+#endif // T_GLXID_H