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[REBOL] Re: About object!s and custom datatypes

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 <> -- REBOL Programmer Amiga Group Italia sez. L'Aquila --- SOON: