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Report From: Delphi-BCB/Compiler/Delphi/Language [ Add a report in this area ]

Report #: 59795

Status: Closed

Enum for in loop to support enumtype

Project: Delphi

Build #: 11.0.2627.5503

Version: 11.0

Submitted By: Huzella BalÃ¡zs

Report Type: Suggestion / Enhancement Request

Date Reported: 3/21/2008 6:14:10 AM

Severity: Infrequently encountered problem

Last Updated: 5/29/2009 1:31:05 PM

Platform: All platforms

Internal Tracking #: 258493

Resolution: Won't Do (Resolution Comments)

Resolved in Build: : 12.0.3320.19366

Duplicate of: None

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Total Votes: 1

Description

It would be great if 'for in do' loops could support enumeration type as a constant set.

This set could be implicitly created by the compiler to allow this type of enumeration.

Steps to Reproduce:

unit Unit1;

interface

implementation

type
  TEnum = (first, second, third);

function ProcessEnum: TEnum;
begin
  for Result in TEnum do
    Continue;
end;

end.

The compiler says:

[DCC Error] Unit1.pas(12): E2029 '(' expected but 'DO' found
[DCC Error] Unit1.pas(13): E2430 for-in statement cannot operate on collection type 'TEnum'

Workarounds

function ProcessEnum: TEnum;
begin
for Result := Low(TEnum) to High(TEnum) do
Continue;
end;

While this is flexible, the 'for in do' style is shorter and smarter.

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