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About object!s and custom datatypes

 [1/6] from: hallvard::ystad::oops-as::no at: 2-Jan-2005 21:15


Hello Gabriele et al., I tried to use custom-types.r to make my own datatype, but it didn't work, because some of Ladislavs subfunc-stuff crashed somehow. But here's a more theoretical question: I was considering turning my url-object (http://www.rebol.org/cgi-bin/cgiwrap/rebol/view-script.r?color=yes&script=url-handler.r) into a datatype for the RIX. I thought that would make way for clearer code. Some of the comparisons I do with URLs take place in a method inside the object. Instead of site1/equal? site2 I would like to write equal? site1 site2 like with basic datatypes like string!s and integer!s. The question is: Would this slow rebol down? What are the most important advantages and disadvantages of making one's own datatypes? I can think of this, for a start: I have, in the 'equal? func, refinements like /regard-section and /regard-cgi-order. I guess these cannot be brought into the 'equal? action? Or is this not so? I find the idea of custom datatypes interesting. Please enlighten me on it's (dis)advantages. Regards, HY

 [2/6] from: lmecir:mbox:vol:cz at: 3-Jan-2005 10:55


Hi Hallvard,
>Hello Gabriele et al., > >I tried to use custom-types.r to make my own datatype, but it didn't work, > because some of Ladislavs subfunc-stuff crashed somehow >
happy New Year to you and to all. I tried to write a new version of pass-args and didn't test the changed Subfunc. Try the version http://www.fm.vslib.cz/~ladislav/rebol/subfunc.r that I posted now. -L

 [3/6] from: gabriele:colellachiara at: 3-Jan-2005 12:04


Hi Hallvard, On Sunday, January 2, 2005, 9:15:34 PM, you wrote: HY> I tried to use custom-types.r to make my own datatype, but it didn't work,HY> because some of Ladislavs subfunc-stuff crashed somehow. But here's a moreHY> theoretical question: That's the downside of experimental code. ;) If you are using the YourValues version (which is very different from my original version), note that it is developed on the latest alphas. HY> site1/equal? site2 HY> I would like to write HY> equal? site1 site2 HY> like with basic datatypes like string!s and integer!s. The question is:HY> Would this slow rebol down? What are the most important advantages andHY> disadvantages of making one's own datatypes? Replacing all the actions slows down REBOL noticeably. That's why I don't do that anymore (only the first version of custom-types.r did that). What I do is create new actions that can handle custom types. I.e.: equal?* site1 site2 The starred actions work on "normal" types too. The disadvantage is that you might end up with more complications than simplifications. :) HY> I can think of this, for a start: HY> I have, in the 'equal? func, refinements like /regard-section andHY> /regard-cgi-order. I guess these cannot be brought into the 'equal? action?HY> Or is this not so? You'd need a different "action". (The point of having "your own datatype", IMHO, is that of following the standard interface of all the other datatypes, so that you don't have to learn a new API.) You could use EQUAL? and STRICT-EQUAL? but I guess that's not enough for you. This would need to be solved differently, design-wise... HY> I find the idea of custom datatypes interesting. Please enlighten me on it'sHY> (dis)advantages. Sometimes having the same API for everything is a great advantage, other times it's just a complication... I guess this is not the answer you wanted to hear. :) Regards, Gabriele. -- Gabriele Santilli <g.santilli-tiscalinet.it> -- REBOL Programmer Amiga Group Italia sez. L'Aquila --- SOON: http://www.rebol.it/

 [4/6] from: hallvard:ystad:oops-as:no at: 3-Jan-2005 13:18


Thanks, but... ** Script Error: sub has no value ** Where: subfunc ** Near: sub context HY Dixit Ladislav Mecir (10.55 03.01.2005):

 [5/6] from: lmecir::mbox::vol::cz at: 3-Jan-2005 13:40


Hallvard Ystad napsal(a):
>Thanks, but... > >** Script Error: sub has no value >** Where: subfunc >** Near: sub context > >HY >Dixit Ladislav Mecir (10.55 03.01.2005): >
Hello, that is exactly the "feature" that has been solved by the update, use Rebol to read the recent file. -L

 [6/6] from: lmecir::mbox::vol::cz at: 3-Jan-2005 13:50


Ladislav Mecir napsal(a):
>Hallvard Ystad napsal(a): >>Thanks, but...
<<quoted lines omitted: 12>>
>use Rebol to read the recent file. >-L
another option is to get it here: http://www.compkarori.com/vanilla/display/subfunc.r&calendar-year=2002&calendar-month=12

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