Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
Hallo Martin, Du schriebst am Tue, 6 Jun 2017 13:12:33 +0200: > Because case in records is crap. It misleadingly pretends that there is > access type control by the tags and it is clumsy. No, that's not the case generally. It is so for the Borland dialects, but not for others. There _are_ Pascal dialects that _do_ make use of the tag and even change the interpretation of the type accordingly, or that use separate storage areas for the tagged variants. The problem with this construct is that it was never clearly specified by the originators (incl. Prof. Wirth himself) how it was meant to be used and thus how it should be implemented. BTW, fpc does indeed store the tag value, if an identifier was specified along with the tag type for the record declaration. This might be useful at times to keep track of the data stored in the variant area. -- -- (Weitergabe von Adressdaten, Telefonnummern u.ä. ohne Zustimmung nicht gestattet, ebenso Zusendung von Werbung oder ähnlichem) --- Mit freundlichen Grüßen, S. Schicktanz --- -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On Tuesday 06 June 2017 13:32:28 Michael Schnell wrote: > On 06.06.2017 13:12, Martin Schreiber wrote: > > Because case in records is crap. It misleadingly pretends that there is > > access type control by the tags and it is clumsy. > > Right you are. But it never had been different in Pascal :( > And it is not a completely new notation, it is the Pascal notation for variant parts without the "case". Martin -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On 06.06.2017 13:12, Martin Schreiber wrote: Because case in records is crap. It misleadingly pretends that there is access type control by the tags and it is clumsy. Right you are. But it never had been different in Pascal :( -Michael -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On Tuesday 06 June 2017 11:36:34 Michael Schnell wrote: > On 04.06.2017 06:21, Martin Schreiber wrote: > > Yes, and the replacement of "case" in pascal records. > > Why introduce a completely new notation instead of just stay with > "case" ? This would be rather obvious in Pascal. > Because case in records is crap. It misleadingly pretends that there is access type control by the tags and it is clumsy. Martin -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On 04.06.2017 06:21, Martin Schreiber wrote: Yes, and the replacement of "case" in pascal records. Why introduce a completely new notation instead of just stay with "case" ? This would be rather obvious in Pascal. -Michael -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
maybe additional keyword ! tcolor = object union cl : record // should be another option for anonymous record !? r,g,b : byte; end; rgb : array[0..2] of byte; end; end; but i like your brackets solution , less verbose , better than case of -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On Sunday 04 June 2017 15:34:14 code dz wrote: > good , even the brackets is not informative for that purpose . Alternatives? Martin -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
good , even the brackets is not informative for that purpose . but , less typing is always good ;) -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
On Saturday 03 June 2017 18:46:20 code dz wrote: > do you mean like union in c++ > Yes, and the replacement of "case" in pascal records. Martin -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
Re: [MSEide-MSEgui-talk] Variant part in MSElang objects
do you mean like union in c++ -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
