In that case if you were qualifying the names they would be qualified to the instance (makes sense if you want the name to be referenced independent of any reference to the instance). Alternatively if you wanted to cache a reference you could cache it in the instance (requires you have a reference to the instance).
There might be other possibilities, depending on your design goals. Thanks, -- Raul On Fri, Sep 1, 2017 at 9:37 AM, 'Jon Hough' via Programming <programm...@jsoftware.com> wrote: > You are correct. However, I really need to use an instance of A (actually the > possibility of several instances existing at the same time). > If I am absolutely sure I only have one instance of A, i.e. myA, then I could > cache the reference in the A locale > cocurrent 'A' > > instance=: '' NB. none by default > coclass 'A' > > create=: 3 : 0 > ... do stuff... > instance_A_=: coname '' > ) > > Then once I have the reference, as I understand it, I can do pretty much > anything by switching in and out of locales, and grab myA's reference when in > B. This will only work if there is a single instance of A. > > But, my whole purpose is to have several different instances of A, any of > whose member verbs can be passed (as gerunds or however else) to some verb in > B locale. > > It seems that an object's verbs do not contain any reference to the actual > object, so what I want is pretty difficult to do in J. > Although this is trivial in some other languages, e.g. pseudo-python: > > # create two instances of A > myA =A(1) > myOtherA = A(10000) > > # pass the instances' method1 to some utility function, "interestingFunction" > # and get some interesting results. > result1 = interestingFunction(myA.method1) > result2 = interestingFunction(myOtherA.method1) > > It seems J's locale system does not handle this very well. > -------------------------------------------- > On Fri, 9/1/17, 'Pascal Jasmin' via Programming <programm...@jsoftware.com> > wrote: > > Subject: Re: [Jprogramming] Passing class member gerund to verb in another > locale > To: "programm...@jsoftware.com" <programm...@jsoftware.com> > Date: Friday, September 1, 2017, 10:19 PM > > this simplification seems to > work, (defined in base) > > > d_A_ =: 1 2 3 > mean_A_ =: 3 : > '(+/ % #) d' > mean_A_ 0 > 2 > > > NB. use F8, also works with funcB_B_ > definition > > funcB=: 3 : 0 > > > 'vrb data' =: y > > > f=: vrb `:6 > > f data > > ) > > > > funcB mean_A_`'' ; 0 > > 2 > > > geoMean_A_ =: 3 : 0 > > NB. same as before, but add d. > > d+(#%:(*/)) y > > ) > > funcB geoMean_A_`'' ; 2 3 4 > 3.8845 4.8845 5.8845 > > funcB_B_ geoMean_A_`'' ; 2 3 4 > 3.8845 4.8845 5.8845 > > > the create verb only gets > called when you do conew, and so d is not defined for > non-instanced locale. one way to fix this is to have a > default value for d that will get overwritten with the > create verb so that it both works with the "raw" > locale and instances. > ________________________________ > From: 'Jon Hough' via Programming > <programm...@jsoftware.com> > To: programm...@jsoftware.com > > Sent: Friday, September 1, 2017 8:48 AM > Subject: Re: [Jprogramming] Passing class > member gerund to verb in another locale > > > > Hi Pascal. > Thanks for the response. You are correct in this case. Not > to move the goal posts, but > > funcB_B_ geomean_A_`'' ; > > > will not work > if geoMean is redefined to be > > > geoMean_A_ =: 3 : 0 > > NB. same as before, but add > d. > > d+(#%:(*/)) y > > ) > > > > The variable > d was created in myA's create verb. This is not visible > from _A_ locale. > > > I will repost the entire (modified) source > below. Note that getAvg__myA calls funB_B_ with gerund > geoMean__myA. > > > > > coclass > 'A' > > > > create=: 3 : 0 > > d=:y > > ) > > > geoMean=: 3 : 0 > > > d+(#%:(*/)) y > > ) > > > myVerb=: 3 : 0 > > ((geoMean ) ; (+/%#)) y > > ) > > > getAvg=: 3 : 0 > > data=.y > > funcB_B_ (myVerb_A_ `''); data > > ) > > > > > > > cocurrent > 'B' > > > NB. accepts the object ref as param. > > NB. helper verb, for special > case of > > NB. classes with a > member verb called myVerb. > > funcB2=: 3 : 0 > > 'obj data'=: y > > > verb=. 3 : ' myVerb__obj > y' > > funcB ((verb f.) > `'');data > > ) > > > > NB. More general verb, accepts any verb > > NB. (assuming verb is callable > from this locale) > > funcB=: 3 > : 0 > > 'vrb data' =: > y > > f=: vrb `:6 > > f data > > ) > > > myA=: 1 conew 'A' > > geoMean__myA 1 2 3 NB. no problem here > > getAvg__myA 1 2 3 NB. > error here > > > > -------------------------------------------- > > On Fri, 9/1/17, 'Pascal > Jasmin' via Programming <programm...@jsoftware.com> > wrote: > > > Subject: Re: [Jprogramming] Passing class > member gerund to verb in another locale > > To: "programm...@jsoftware.com" > <programm...@jsoftware.com> > > Date: Friday, September 1, > 2017, 8:19 PM > > > funcB_B_ geomean_A_`'' ; > > data > > do not use f. inside funcB. f. will > > lose locale info > > > > > From: 'Jon Hough' via > Programming <programm...@jsoftware.com> > > To: programm...@jsoftware.com > > > Sent: > Friday, September 1, 2017 1:09 AM > > Subject: Re: [Jprogramming] Passing class > > member gerund to verb in > another locale > > > > > I forgot to > add a definition of funcB > > > cocurrent 'B' > > > funcB=: 3 : > 0 > > 'vrb data' =: > y > > f=: vrb > > `: 6 NB. vrb is the > gerund > > f data NB. > > call f. This creates the > error. > > ) > > > > -------------------------------------------- > > On Fri, 9/1/17, 'Jon > Hough' via > > Programming > <programm...@jsoftware.com> > > wrote: > > > Subject: > > [Jprogramming] Passing class > member gerund to verb in > > another locale > > To: "Programming > > Forum" <programm...@jsoftware.com> > > Date: Friday, September 1, > 2017, 2:03 PM > > > > My problem is, I have > a > > class 'A' say. > > and I have a locale > > 'B'. > > > > A contains > > several verbs. I would like > > to pass a verb > > (or gerunds of the verbs), let's call it > > myVerb, to some verb in B. > However, this > > creates a > problem, > > as > > when > > the B verb tries to call myVerb it > > cannot > > find it, being in a different locale. i.e. I > get a > > value error. I > attempted to use fix (f.) to > > get myVerb > > > explicitly, but this only > > works if myVerb does not contain any > > other verbs from A. > > > > This is the contrived example, that is > > essentially the same as my > real problem, but > > stripped > of > > superfluous > things: > > > > NB. A is some class with > > several > > verbs. > > > coclass > > 'A' > > > > > > > create=: 3 : 0 > > d=:y > > ) > > > > NB. > some > > verb in A > > geoMean=: 3 : 0 > > (#%:(*/)) y > > ) > > > > > > NB. I want > > to pass this to another > verb > > in another > > locale. > > NB. Note that it calls geoMean. > > myVerb =: 3 : 0 > > ((geoMean > > f.) ; (+/%#)) y > > ) > > > > > > NB. calling a verb in B > > getAvg=: 3 : 0 > > data=.y > > funcB_B_ ( myVerb f. `''); data > > ) > > > > NB. > > create my instance of A > > myA =: 0 conew > > 'A' > > NB. call myVerb. No > problem > > here! > > myVerb__myA 1 2 3 > > > NB. pass > myVerb to funcB_B_ > > > getAvg__myA 1 2 > > 3 > > NB. this gives an error > > > |value error: > geoMean > > | ((geoMean > > > > > f.);(+/%#))y > > > > > > > > > Solutions: > > > (1) One solution is to make > > funcB_B_ a > > > conjunction / adverb. But in > > reality, I want to send several > > verbs to > > funcB together. > > (2) Another solution is > to > > send the > > instance reference of A to > funcB > > (i.e. just send the > whole > > of myA to > funcB). > > But I would prefer > not to send the whole > > > object, as it then makes B less flexible, > because I may > > want > > to call funcB_B_ without > the need for > > a class > instance, just > > a > standalone > > verb. > > (3) Another solution is to > not call > > any > > other verbs of myA inside > myVerb__myA. > > This is not > a > > realistic solution as > A could > > be quite > complicated. > > > > > > Is there a better way? > > > > Just to > explain my motivation, I am > > trying to replicate the functionality > most > > languages that > > have first-class > functions > > possess - to pass > arbitrary > > function(s) > > to > > other functions and call them. > > e.g. in Python > > > > # myVerb is a Python function, and > > could be a member method of > some class. > > someData is > just > > some data > > > def funcB > (myVerb, someData): > > > return > > myVerb(someData, > > someOtherData) > > > > > Obviously J doesn't have > > first class > > > functions in this sense, but > > with gerunds, I was hoping to > > be able to > > recreate the functionality. > > > > > > ---------------------------------------------------------------------- > > For information about J > forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > > For information about J forums > see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > For information about J forums > see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > > For information about J forums > see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
