0008951: FPC doesn't allow implements properties be of class types - Free Pascal/Lazarus Bug Tracker

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ID

Project

Category

View Status

Date Submitted

Last Update

0008951

FPC

Compiler

public

2007-05-26 01:48

2012-01-04 15:53

Reporter

Mario R. Carro

Assigned To

Ivo Steinmann

Priority

normal

Severity

major

Reproducibility

always

Status

assigned

Resolution

open

Platform

OS

OS Version

Product Version

Product Build

Target Version

2.4.0

Fixed in Version

Summary

0008951: FPC doesn't allow implements properties be of class types

Description

Delphi allows implements properties to be of class types derived from TAggregatedObject, but FPC requires them to be of interface types.

For example this line (from the JclSchedule.pas unit of the JCL):

property DailyFreq: TDailyFreq read FDailyFreq implements IJclScheduleDayFrequency;

fails to compile with the message:

JclSchedule.pas(1327,87) Error: Implements property must have interface type

Tags

FPCOldBugId

0

Fixed in Revision

test.pas [^] (440 bytes) 2007-06-05 00:54

implements.html [^] (69,497 bytes) 2009-04-25 12:15

Relationships

parent of	0016531	new		Partial interface delegation to class
related to	0004842	assigned	Ivo Steinmann	implements keyword in properties
related to	0012778	closed	Ivo Steinmann	GetInterface returns wrong results when using delegated interfaces
related to	0016365	resolved	Ivo Steinmann	Interface delegation by class type property
Not all the children of this issue are yet resolved or closed.

Notes
(0012814) Jonas Maebe (manager) 2007-05-26 16:09	Please provide a compilable sample program.

(0012961) Mario R. Carro (reporter) 2007-06-05 00:57	Hi. The program I uploaded compiles without errors with D7, but fails with FPC r7578: Free Pascal Compiler version 2.3.1 [2007/06/04] for i386 Copyright (c) 1993-2007 by Florian Klaempfl Target OS: Linux for i386 Compiling test.pas test.pas(17,63) Error: Implements property must have interface type test.pas(18,6) Error: No matching implementation for interface method "IIntf.F:DWord" found test.pas(27) Fatal: There were 2 errors compiling module, stopping Fatal: Compilation aborted Error: /usr/local/bin/ppc386 returned an error exitcode (normal if you did not specify a source file to be compiled)

(0015797) Marco van de Voort (manager) 2007-10-28 14:00	Also ran into this. Lazarus is preparing to support JVCL that depends on JCL, so it would be nice if it was fixed.

(0017592) Marco van de Voort (manager) 2008-02-03 21:41	Found something: http://www.geocities.com/svi37/cyber/delphi9/iimplementation.html [^]

(0027067) Jonas Maebe (manager) 2009-04-25 12:15	I've attached that page since Geocities is being discontinued.

Issue History
Date Modified	Username	Field	Change
2007-05-26 01:48	Mario R. Carro	New Issue
2007-05-26 16:09	Jonas Maebe	Note Added: 0012814
2007-06-05 00:54	Mario R. Carro	File Added: test.pas
2007-06-05 00:57	Mario R. Carro	Note Added: 0012961
2007-06-13 10:08	Marco van de Voort	Note Added: 0013172
2007-06-13 10:34	Marco van de Voort	Note Deleted: 0013172
2007-10-28 14:00	Marco van de Voort	FPCOldBugId	=> 0
2007-10-28 14:00	Marco van de Voort	FPCTarget	=> -
2007-10-28 14:00	Marco van de Voort	Note Added: 0015797
2007-10-28 14:00	Marco van de Voort	Severity	minor => major
2007-10-28 14:01	Marco van de Voort	Relationship added	related to 0004842
2008-01-29 23:25	Marco van de Voort	Status	new => assigned
2008-01-29 23:25	Marco van de Voort	Assigned To	=> Florian
2008-02-03 21:41	Marco van de Voort	Note Added: 0017592
2008-05-07 12:08	Marco van de Voort	Tag Attached: jcl
2008-12-10 09:04	Marco van de Voort	Relationship added	related to 0012778
2009-04-25 12:15	Jonas Maebe	File Added: implements.html
2009-04-25 12:15	Jonas Maebe	Note Added: 0027067
2009-08-09 11:28	Florian	Target Version	=> 2.4.0
2009-10-16 23:39	Marco van de Voort	Tag Attached: com
2010-03-27 16:18	Ivo Steinmann	Assigned To	Florian => Ivo Steinmann
2010-04-29 18:01	Jonas Maebe	Relationship added	related to 0016365
2012-01-04 15:53	Marco van de Voort	Relationship added	parent of 0016531

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