Is (keyword)

From RemObjects Software

This keyword is used in two contexts:

Type checking

if <object> is <type> then …
if <object> is not <type> then …

Generic constraints

is is used within a where clause:

type
  MyArrayList<T> = public class(ArrayList, IPersistentCollection)
    where T is PersistentObject, T has constructor;

As well as allowing you to check for a particular type, Oxygene generics also supports 'is record' and 'is class':

type
  GenericThatOnlyTakesARecord<T> = class
  where T is record;
    FVal: T;
  public
    constructor (Val: T);
  end;

  GenericThatOnlyTakesAClass<T> = class
  where T is class;
    FVal: T;
  public
    constructor (Val: T);
  end;

See Also

• Type Checking
• Type Casts
• Generic Types
• Expressions

Product: RemObjects Oxygene (formerly known as Chrome)
Current version: 3.0 Previous Versions: 'Joyride' (2.0), 'Floorshow' (1.5), 'Adrenochrome' (1.0)