I'm used to do this kind of things like this: Public Sub _new(Optional x As Float = -1, Optional y As Float = -1 ,Optional z As Float = -1) If x <> -1 Then v[0] = x If y <> -1 Then v[1] = y If z <> -1 Then v[2] = z End
Jussi 2010/6/10 Benoît Minisini <gam...@users.sourceforge.net>: >> On 10/06/10 15:38, Charlie Reinl wrote: >> > Am Donnerstag, den 10.06.2010, 14:37 +0800 schrieb Werner: >> >> I'm trying to implement a simple class that creates a Float[3] array. I >> >> would like to give the user of the class an optional opportunity to fill >> >> the array with data when the class is instantiated. >> >> >> >> ---------------------------------------- >> >> ' Gambas class file >> >> ' Vector3f Class >> >> >> >> Public v As New Float[3] >> >> >> >> Public Sub _new(Optional x As Float, y As Float, z As Float) >> >> >> >> If Param.Count > 0 Then v[0] = x >> >> If Param.Count > 1 Then v[1] = y >> >> If Param.Count > 2 Then v[2] = z >> >> >> >> End >> >> --------------------------------------- >> >> >> >> The above does not work because Param.Count is always 0 no matter if >> >> parameter values are supplied or not. My guess is that's because >> >> Optional can only be used from the second parameter onwards (why?). >> >> >> >> How can I make this class do what it should? >> >> >> >> Thanks >> >> Werner Dahn >> > >> > Salut Werner, >> > >> > where Param is filled? , what is Param ? an array? the class ? >> > >> > for Optional, I do not know if it can be chained like you do. >> > But it can be used also on the first Parameter. >> >> Param is a Gambas Class. It can be used to find out how many parameters >> are supplied to a routine. It's just the way my example is written it >> always gives a Count of zero, no matter how many parameters are actually >> supplied. >> http://gambasdoc.org/help/comp/gb/param >> >> >> Regards >> Werner >> > > Param is only useful inside a method that takes a "variable number of > arguments", i.e. whose argument list ends with "...". > > You cannot use it for optional arguments. Maybe the documentation is not clear > enough, as you thought that. > > Optional arguments that are not passed by the caller just take their default > value. > > Regards, > > > -- > Benoît Minisini > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > Gambas-user mailing list > Gambas-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gambas-user > ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
