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https://gitlab.com/freepascal.org/fpc/source.git
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aa5a5e79ce
rtl: add enumerators to the basic classes tests: add enumerators test which compiles and work both by fpc and dcc compiler: + start for-in loop implementation: implement for-in loop for types (enumerations and ranges), strings, arrays and sets. todo: perform type checking, optimize array and string loops - use temp for expression, implement for-in loop for classes test: + add a simple test for the 'for-in' loop compiler: fix string for-in loop. now it uses a temp variable to store string expression result complier: fix for-in array loop. use a temp variable for the loop expression only if loop is not an open array loop complier: continue enumerator implementation: + add operator enumerator which give an ability to add enumerator for an existent type (for example to override builtin string enumerator) + add class enumerator support via delphi compatible GetEnumerator method + enumerator class/object template (function MoveNext: Boolean; property Current) + tests compiler: fix for-in loop for arrays. delphi does not copy arrays to a temp variable and it is possible to change array during loop. + test compiler: add reference for the enumerator operator when it is used + another test for operator enumerator for a class compiler: add reference for the enumerator operator when it is used + another test for operator enumerator for a class compiler: enumerator directive support: + allow to mark methods and properties by 'enumerator MoveNext' and 'enumerator Current' modifiers. Parser checks return types and duplicates. + prefer *marked* by enumerator directive methods and properties than GetEnumerator and Current builtin symbols + increase ppu version + test rtl: add IEnumerator and IEnumerable interfaces declarations tests: for-in loop tests: + add small comment at the top of test program compiler: allow 'enumerator MoveNext' for the interface function declaration + test compiler: move all for-in loop helpers to the nflw unit compiler: don't allow the compiler to choose the non-valid enumerator operator for the for-in loop git-svn-id: trunk@14008 -
69 lines
1.2 KiB
ObjectPascal
69 lines
1.2 KiB
ObjectPascal
program tforin9;
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// Test interface with 'enumerator MoveNext', 'enumerator Current' directives
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{$mode objfpc}{$H+}
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{$APPTYPE CONSOLE}
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type
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{ IMyIterator }
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IMyIterator = interface
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function GetValue: TObject;
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function StepForward: Boolean; enumerator MoveNext;
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property Value: TObject read GetValue; enumerator Current;
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end;
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{ TMyListEnumerator }
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TMyListEnumerator = class(TInterfacedObject, IMyIterator)
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private
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FValue: Pointer;
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function GetValue: TObject;
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public
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function StepForward: Boolean;
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property Value: TObject read GetValue;
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end;
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TMyList = class
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public
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function GetIterator: IMyIterator;
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end;
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operator Enumerator(AList: TMyList): IMyIterator;
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begin
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Result := AList.GetIterator;
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end;
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{ TMyListEnumerator }
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function TMyListEnumerator.GetValue: TObject;
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begin
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Result := TObject(FValue);
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end;
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function TMyListEnumerator.StepForward: Boolean;
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begin
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inc(PByte(FValue));
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Result := FValue <= Pointer(3);
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end;
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{ TMyList }
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function TMyList.GetIterator: IMyIterator;
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begin
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Result := TMyListEnumerator.Create;
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end;
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var
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List: TMyList;
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i: TObject;
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begin
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List := TMyList.Create;
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for i in List do
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WriteLn(PtrInt(i));
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List.Free;
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end.
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