interface IFoo
{
    void FooMethod();
};

// alternatively
class IFoo
{
    virtual void FooMethod() = 0;
};

class FooImplementer : public IFoo
{
    void FooMethod();
}

void FooImplementer::FooMethod()
{
}

void test()
{
    IFoo * p1;
    // alt+g on FooMethod will list 3 destinations 
    // (IFoo::FooMethod, FooImplementer::FooMethod decl, FooImplementer::FooMethod impl
    p1->FooMethod();  


    FooImplementer * p2;
    // no change in behavior 
    // (alt+g will not list IFoo::FooMethod)
    p2->FooMethod();
}