NONSHARABLE_CLASS

NONSHARABLE_CLASS (x) class __declspec(notshared) x

Description

Declares a class as being non-sharable.

If a class is non-sharable, then a class implemented in another DLL cannot derive (inherit) from that class.

Declaring a class as non-sharable prevents the compiler from exporting compiler implementation-specific symbols, i.e. run-time type-information and virtual tables. This prevents classes in other DLLs from being able to derive from it.

Note :

• if a class is marked as non-sharable, then Symbian OS requires all classes that are derived from that class, and which are also implemented in the same DLL, to be declared as non-sharable.

• by default, a class is sharable.

The following code fragment shows how a non-sharable class is declared.

NONSHARABLE_CLASS(CMyClass) : public CBase
    {
    public :
    ...
    private :
    ...
    }

Parameters

x The name of the class to be declared as non-sharable.