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Enumerator support interface
Source position: objpash.inc line 273
type IEnumerator = interface(IInterface) |
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function GetCurrent; |
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Returns the current element in the iteration cycle |
function MoveNext; |
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Move to the next value |
procedure Reset; |
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Reset the pointer |
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Return the current item |
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end; |
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Enumerator support interface |
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IInterface |
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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.
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Interface to retrieve an enumerator from a class. |