Abstract Types

Some articles on abstract types, abstract, abstract type, type:

Use of Abstract Types
... Abstract types are an important feature in statically typed OO languages ... (although the use of duck typing makes abstract types unnecessary) however traits are found in some modern dynamically-typed languages ... Some authors argue that classes should be leaf classes (have no subtypes), or else be abstract ...
Abstract Type
... In programming languages, an abstract type, unlike Concrete class is a type in a nominative type system which cannot be instantiated ... may have concrete subtypes that do have instances.) An abstract type may have no implementation, or an incomplete implementation ... It may include abstract methods or abstract properties that are shared by its subtypes ...

Famous quotes containing the words types and/or abstract:

    If there is nothing new on the earth, still the traveler always has a resource in the skies. They are constantly turning a new page to view. The wind sets the types on this blue ground, and the inquiring may always read a new truth there.
    Henry David Thoreau (1817–1862)

    Alice grown lazy, mammoth but not fat,
    Declines upon her lost and twilight age;
    Above in the dozing leaves the grinning cat
    Quivers forever with his abstract rage....
    Allen Tate (1899–1979)