Instead they are defined as abstract data type in libraries.

Another disadvantage is that one often cannot access the method on an abstract type.

The animal group are generally only found in combination with the abstract types.

Users of the language can also define their own abstract data types.

There are two other major abstract data types for meta-programming.

A class containing a pure virtual function is called an abstract data type.

Such abstract data types can only be derived from.

And there are many artists who work in abstract and other types of modern art.

Bunch (computer science), an abstract data type that can be understood as a set without the "packaging"

These axioms are equivalent to those of the abstract stack data type.