delphi - How is Enumerator created with for in construction destroyed? -


i have collection derived tcollection, implementing getenumerator can use in construction like

for lelem in lcollection

the enumerator derived tobject, standard enumerators supplied delphi , therefor doesn't have owner.

the delphi mentions if enumerator supports idisposable disposed of, .net of course.

what wondering is, how , when , enumerator instance freed?

for each for-enum statement compiler generates code corresponds pseudocode:

enumerator := list.getenumerator; try   while enumerator.movenext     enumerator.current;   enumerator.free; end;

the code above generated enumerators implemented class instances. if enumerator implemented interface, last line not call .free merely decrement interface reference count allowing destroyed.


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