examples/Basics/ExtensionPattern/include/NumberStore.h

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Description: 
Header file demonstrating Extension DLL pattern
This is the header file declaring the CNumberStore class.
This file contains both the original functions and also the functions added by
the extension.  Therefore this file is modified by the extender of the API. 
*/


#if !defined(__NUMBERSTORE_V2__)
#define __NUMBERSTORE_V2__

#include <e32std.h>
#include <e32base.h>

/* class CNumberStore
A trivial class to own two numbers */
class CNumberStore : public CBase
        {       
public: //functions
        
        // Original functions contained in dll from supplier
        IMPORT_C CNumberStore ();
        IMPORT_C CNumberStore (TInt aNumber1, TInt aNumber2);
        IMPORT_C void SetNumber1 (TInt aNumber1);
        IMPORT_C void SetNumber2 (TInt aNumber2);
        IMPORT_C TInt Number1 () const;
        IMPORT_C TInt Number2 () const;

        // New functions added as a product specific extension to be implemented elsewhere
        // AddNumbers is a "non-intrusive" function that will be fully implemented in the extension
        IMPORT_C TInt AddNumbers() const;
        // MultiplyNumbers is an "intrusive" function that will be implemented in the orginal dll as DoMultiplyNumbers
        IMPORT_C TInt MultiplyNumbers() const;

private: //functions
        
        // DoMultiplyNumbers is the local implementation of MultiplyNumbers. Private to force all clients to call it
        // via the MultiplyNumbers function in the extension dll.  It must be implemented in this DLL as it needs access
        // to a constant which is defined in originaldll.dll
        IMPORT_C TInt DoMultiplyNumbers() const;

private: //data
        TInt iNumber1;
        TInt iNumber2;
        };

#endif //__NUMBERSTORE_V2__

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