BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  features request ;)          BorlandTalk.com Forum Index -> Delphi Non-Technical View previous topic :: View next topic   Author Message Andrew Rybenkov Guest Posted: Wed Jul 28, 2004 3:33 pm    Post subject: features request ;) a) Extend subrange type definition to make possible something like that: MyType = 1..10, 77, 100..200; b) permit using other defined subrange types in type definition, like MyExtType = 0, MyType, 201..299; c) in case of b) - also adding "include" and "exclude" words to type defs: MyNewType = MyType exclude 77, 113..119 include 777; -- Andrew Rybenkov. Back to top TObject Guest Posted: Wed Jul 28, 2004 5:33 pm    Post subject: Re: features request ;) I am curious, where would you use such bizarre types? Back to top Andrew Rybenkov Guest Posted: Wed Jul 28, 2004 5:58 pm    Post subject: Re: features request ;) Quote: I am curious, where would you use such bizarre types? the same places where I would use "normal" subrange types. -- Andrew Rybenkov. Back to top TObject Guest Posted: Wed Jul 28, 2004 6:06 pm    Post subject: Re: features request ;) "Andrew Rybenkov" <arybenkov (AT) hotmail (DOT) com> wrote Quote: I am curious, where would you use such bizarre types? the same places where I would use "normal" subrange types. The ones in your examples are far from "normal". Back to top Andrew Rybenkov Guest Posted: Wed Jul 28, 2004 7:52 pm    Post subject: Re: features request ;) Quote: The ones in your examples are far from "normal". firstly, "normal" subrange types are those that can be defined in Pascal/Delphi now. secondly, when one provides an example to simplify understanding of his/her idea, he/she tries to make the example simple as much as possible A bit more meaningful example: type PrimesLessThan20 = 2..3,5,7;11,13,17,19; type PrimesLessThan10 = PrimesLessThan20 exclude 10..19; I would like compiler {R+}-check a PrimesLessThan10 at the debugging phase, regardless computing burden such declarations will produce. -- Andrew Rybenkov. Back to top Robert Marquardt Guest Posted: Wed Jul 28, 2004 7:59 pm    Post subject: Re: features request ;) Andrew Rybenkov wrote: Quote: a) Extend subrange type definition to make possible something like that: MyType = 1..10, 77, 100..200; b) permit using other defined subrange types in type definition, like MyExtType = 0, MyType, 201..299; c) in case of b) - also adding "include" and "exclude" words to type defs: MyNewType = MyType exclude 77, 113..119 include 777; -- Andrew Rybenkov. This is a typical request from a newbie to language design. Did you think it through? Apart from the syntactical challenges it contains general problems with illegal values etc. Not to mention the implementation horror. Back to top Brion L. Webster Guest Posted: Wed Jul 28, 2004 8:08 pm    Post subject: Re: features request ;) TObject wrote: Quote: "Andrew Rybenkov" <arybenkov (AT) hotmail (DOT) com> wrote... I am curious, where would you use such bizarre types? the same places where I would use "normal" subrange types. The ones in your examples are far from "normal". I could see, if, by chance, you hard coded "product ID's", you might want to exclude discontinued products, or products in a different line. Hard coding Product ID's is a sub-optimal idea, but I can at least see where discontinous ranges might be useful. They pop up in math all the time. -Brion Back to top TObject Guest Posted: Wed Jul 28, 2004 8:29 pm    Post subject: Re: features request ;) That makes sense. Thank you. Back to top Andrew Rybenkov Guest Posted: Wed Jul 28, 2004 9:14 pm    Post subject: Re: features request ;) Quote: ... a newbie to language design. ))) Quote: Did you think it through? I think so. Quote: it contains general problems with illegal values etc. what are those problems (different from usual subrange ones)? Quote: Not to mention the implementation horror. any sophisticated program (and a compiler certainly is) is an implementation horror. ~40 years ago (when computing science was rather young) they were able to produce working compilers for such mammoths as PL/1 or, especially, Algol-68, and it did not took decades. -- Andrew Rybenkov. Back to top Daniel Becroft Guest Posted: Thu Jul 29, 2004 2:08 am    Post subject: Re: features request ;) Andrew Rybenkov wrote: Quote: The ones in your examples are far from "normal". firstly, "normal" subrange types are those that can be defined in Pascal/Delphi now. secondly, when one provides an example to simplify understanding of his/her idea, he/she tries to make the example simple as much as possible A bit more meaningful example: type PrimesLessThan20 = 2..3,5,7;11,13,17,19; type PrimesLessThan10 = PrimesLessThan20 exclude 10..19; I would like compiler {R+}-check a PrimesLessThan10 at the debugging phase, regardless computing burden such declarations will produce. Personally, I would prefer set constructs over include/exclude keywords. Like: type PrimesLessThan20 = 2..3,5,6;11,13,17,19; type PrimesLessThan10 = PrimesLessThan20 - 10..19; { set 'difference' operation } That, to me, would be more useful, and could allow for more possibilities. You could use intersection to use only the common values, union to use all values, etc. -- Daniel Becroft ; ================================= "Real computer scientists don't comment their code. The identifiers are so long they can't afford the disk space." "Blue sparks and white smoke, the two most expensive components of any electrical system, and once used up will cost a fortune to replace." Back to top Hallvard Vassbotn Guest Posted: Thu Jul 29, 2004 7:08 am    Post subject: Re: features request ;) Andrew Rybenkov wrote: Quote: a) Extend subrange type definition to make possible something like that: MyType = 1..10, 77, 100..200; That isn't a subrange. A subrange is a range between two numbers (min..max). You could define this as a set, of course: MyType = [1..10, 77, 100..200]; Sets do support your b) and c) requests too. But from your other post it looks like you want this to be implemented as an array or list? Back to top Andrew Rybenkov Guest Posted: Thu Jul 29, 2004 11:47 am    Post subject: Re: features request ;) Quote: Personally, I would prefer set constructs over include/exclude keywords. that would be ideally. -- Andrew Rybenkov. Back to top Andrew Rybenkov Guest Posted: Thu Jul 29, 2004 11:49 am    Post subject: Re: features request ;) Quote: You could define this as a set, of course: set is set, number is number. Quote: But from your other post it looks like you want this to be implemented as an array or list? not at all, just simple number with difinite values. -- Andrew Rybenkov. 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