The basic problem is attempting to do OO for its own sake. On Mon, Sep 15, 2014 at 2:32 PM, Raul Miller <rauldmil...@gmail.com> wrote:
> I can see two things you are doing wrong here, perhaps three. > > First, consider: > > myVerb=: +/ % # > MyVerb 1 2 3 > |value error > > J is case sensitive. > > Next, consider: > coname'' > base > myVerb_base_ > +/ % # > myVerb_z_ > |value error > > You defined myVerb in the base locale, and not in the z locale. > > So that's two things. > > Next let's consider the design of your constructor: > > coclass 'MyClass' > > create=: verb define > myValue=: ".y > ) > > This says that you are expecting the constructor to be getting an sentence > which will be evaluated in the object's locale. That means that any names > would have to be defined in the z locale or in your class definition > definition (by default your object inherits from z and the class but not > from any other locale). So that's the possible third problem. > > You might instead want the object to inherit from some other locale (in > this example, you have implied you are interested in the base locale). You > could make the class inherit from base: > > coclass 'MyClass' > coinsert 'base' > > create=: verb define > myValue=: ".y > ) > > Or maybe you think that that is a bad idea, and instead only want the > sentence to be evaluated in the base locale: > > coclass 'MyClass' > > create=: verb define > myValue=: do_base_ y > ) > > (There is no way to discover what locale you were called from unless > debugging was enabled before the call was made, or unless some > programmer-imposed convention was used to identify the calling locale.) > > Of course, you could just specify the locale where the name was defined in > the sentence you pass to the constructor: > > 'myVerb_base_ 1 2 3' conew 'MyClass' > +-+ > |5| > +-+ > myValue_5_ > 2 > > I'd also take note of the other responses you've gotten. > > Thanks, > > -- > Raul > > > > > > > On Mon, Sep 15, 2014 at 10:38 AM, Jon Hough <jgho...@outlook.com> wrote: > > > OOJ = object oriented J > > I have a preexisting verb, for example lets call it myVerb =. +/ % #. > > Next I define a class: > > coclass 'MyClass' > > create =: verb define myValue =: ". y > > ) > > So, essentialy my value is going to run the command y, using verb ". > > So perhaps I want y to by 'myVerb 1 2 3' > > Then, hopefully myValue will be 2. > > So I do > > myObj =: conew 'MyClass' > > create__myObj 'MyVerb 1 2 3' > > However, I get a value error for MyVerb. I asusme this is because myVerb > > was defined in a different locale. > > I then tried create__myObj 'MyVerb_z_ 1 2 3' > > Which also gives a value error. > > By the way, what I am trying to do is pass a callback to the constructor > > of MyClass, so I can execute an arbitrary function. I am using ". to call > > the arbitrary function. I think this method of callbacks was shown in J > for > > C. > > So the question is, what is my code doing wrong? > > Thanks. > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
