On Thu, 18 May 2017, PICCORO McKAY Lenz wrote: > 2017-05-18 9:13 GMT-04:00 Tobias Boege <tabo...@gmail.com>: > > > You can also specify parameters to the _new() method like > > > > ' In MyClass.class: > > Public Sub _new(X As Integer) > > ' ... > > End > > > > a question: can be "Optional" allowed in constructor arguments..? > > its possible, so its the same as override in C: > > Public Sub _new(Optional x As String = "pepe") > > Print " es " & x > > End > > gambas its wonderfull.... >
Yes, they can be optional. If you use optional constructor arguments you have to be careful with inheritance, though! Along the inheritance lineage, all constructor arguments are divided into two camps: mandatory and optional arguments. When the final inherited constructor signature is computed, both camps are sorted separately with the elders' arguments first and then all the mandatory arguments precede the optional arguments, e.g. ' Parent.class Public Sub _new(ParentArg, ParentArg2, Optional ParentOpt) ' Child.class Inherits Parent Public Sub _new(ChildArg, Optional ChildOpt) results in the following complete signature for Child._new(): _new(ParentArg, ParentArg2, ChildArg, ParentOpt, ChildOpt) Note that the optional argument of the parent comes *after* the mandatory argument of the child. There is an extra section in the object model wiki page about this [1]. Regards, Tobi [1] http://gambaswiki.org/wiki/doc/object-model#t18 -- "There's an old saying: Don't change anything... ever!" -- Mr. Monk ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
