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C++ Abstract classes as Interfaces

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So I'm trying to use a pure virtual class as an Interface. Thus I could have a function accept the interface like:
Quote:
class SomeInterface { virtual void interfaceFunction() = 0; } void f( SomeInterface obj );
But I get a compilation error obviously saying "SomeInterface does not implement pure virtual function 'interfaceFunction'". So I did:
Quote:
class SomeInterface { virtual void interfaceFunction() {} }
Which works, but of course, now does not require inheriting classes to over ride the interface function. So how should this be done?

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f( SomeInterface obj ); defines a function which takes an instance of SomeInterface, which is impossible (such an instance cannot exist, because SomeInterface is abstract).

Have f take a reference or pointer to an object instead.

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