Typedef super

A useful addition to a derived class is a typedef aliasing the base class as super:

class Derived : public Base
{
private:
    typedef Base super;
};

This allows you to use super to call the base class constructor from the derived class:

    Derived(int i, int j)
        : super(i), j_(j)
    {
    }

You can also use super to call the base class version of a virtual function in a derived class override:

 virtual void Show()
{
    super::Show();
    std::cout << "Derived Show()\n";
}

It means that if you need to add another layer of inheritance, you only need to change the inheritance part of the class declaration and this typedef.

class Derived : public Intermediate
{
private:
    typedef Intermediate super;
};

You should make the typedef private, to prevent it from being inherited and accidentally used from derived classes that do not declare it.

Visual C++ has a non-standard extension __super: __super.

It is available in Java: Using the Keyword super.

Nowadays you should probably use using:

class Derived : public Base
{
private:
    using super = Base;
};

So it should probably be called the "using super =" idiom.