IEnumerator interface

Declaration

IEnumerator = class(IInterface)

Inheritance

1. IEnumerator
2. IInterface

Description

IEnumerator is the interface needed by the For ... in ... language construct, when operating on classes. It contains all methods that the compiler needs to implement a loop.

A for in loop like the following:

For O in MyObject do
  begin
  // do things
  end;

is treated by the compiler as equivalent to the following code:

Var
  I : IEnumerator;
  O : TObject;

begin
  I:=MyObject.GetEnumerator;
  While I.MoveNext do
    begin
    O:=I.GetCurrent;
    // Do things
    end;
end.

Any class that implements the IEnumerable interface must be able to return an IEnumerator instance for the compiler to use in a For in loop.

See also

• IEnumerable

Properties

Methods