Indeed, this is also another solution, probably the best one right now! Benoit Hediard
-----Message d'origine----- De : Gaulin, Mark [mailto:[EMAIL PROTECTED]] Envoyé : vendredi 27 septembre 2002 21:24 À : CF-Talk Objet : RE: So many problems with CFC scopes... Why not put the "not IsDefined()" test right inside any udf library that can potentially be included more than one time? (Just put the body of the udf inside the CFIF block.) This is like the old "#ifndef _MYFILE_H_", "#define _MYFILE_H_" style that is used all the time in C and C++ programming. Mark -----Original Message----- From: Benoit Hediard [mailto:[EMAIL PROTECTED]] Sent: Friday, September 27, 2002 2:43 PM To: CF-Talk Subject: RE: So many problems with CFC scopes... >> I'm going to look the other issues up in the bugbase in the next few >> days and see what's there but I'll address these issues here... Thanks Sean, you're the best. >>> WORKAROUND : use the <cfif isDefined("oneOfTheFunctionName")><cfinclude >>> template="myUDFlib.cfm"></cfif> in the CFC to test if the UDF lib has >>> already be included. >>Yes, that is what we do here. It also encourages you to have one >>function per include file... If we have to implement manually <cfif isDefined("function")> each time we want to include a UDF lib, I was wondering why this is not automatically done by CF. If the function is already defined and the new definition is identical to the first one, CF might ignore the second definition instead of throwing an error. It would save us a lot of work and possible errors (if someone forget the <cfif isDefined("")>). I agree that CF should throw an error if the method definition is different (defined in another template lib than the previous one), but not if the method definition is identical (defined in the same template lib than the previous one). Is it impossible to implement? With complex CFCs, I personally find that it is much cleaner and easier to only define the necessary UDF lib inside each included CFC method files instead of all the necessary UDF lib at the top of the CFC (especially if you use one function per include file with <cfif isDefined()> around each). >> What if the file changes during the processing of the request? Would it give problems? If the template is changed during the processing of the request, the new function definition would be ignored (defined in the same template than the previous one), isn't it? I agree that the <cfif isDefined("")> is OK, but I am just curious to know if the UDF lib include behaviour could be improved. Benoit Hediard -----Message d'origine----- De : Sean A Corfield [mailto:[EMAIL PROTECTED]] Envoyé : vendredi 27 septembre 2002 19:39 À : CF-Talk Objet : Re: So many problems with CFC scopes... I'm going to look the other issues up in the bugbase in the next few days and see what's there but I'll address these issues here... On Friday, Sep 27, 2002, at 02:36 US/Pacific, Benoit Hediard wrote: > - CFC methods defined in an included file cannot really include UDF > lib. > Indeed, CF refuses to include twice the same UDF lib in one single > script, > which could be the case with two CFC included methods definition that > use > the same UDF lib. Because you cannot have more than one definition of a function - which is what happens when you include the UDF multiple times. You can't do this in most other languages (define the same function twice) so I don't know why you'd expect it to work in CF. > - UDF lib cannot be included in a CFC if the UDF lib is already > included in > the script calling the CFC. This is essentially the same problem as above. > WORKAROUND : use the <cfif isDefined("oneOfTheFunctionName")><cfinclude > template="myUDFlib.cfm"></cfif> in the CFC to test if the UDF lib has > already be included. Yes, that is what we do here. It also encourages you to have one function per include file... > I wonder if it could be possible that CF accept to include several > times the > same UDF lib : if it is the same file, it should not complain about it. What if the file changes during the processing of the request? "I have always wished that my computer would be as easy to use as my telephone. My wish has come true - I no longer know how to use my telephone." -- Bjarne Stroustrup ______________________________________________________________________ This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting. FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
