Subclassing and attribute methodsThis is a discussion on Subclassing and attribute methods within the REXX forums in Programming Languages category; Hi All, Is there a limitation whereby a subclass cannot use attribute methods from the parent or is there a trick I can't find? My results return a non-initialised var, i.e., an uppercase method name. /* */ one = .one~new two = .two~new ::class one ::method one attribute ::method two return 'hello' ::method init self~one = 'hello' say self~one ::class two subclass one ::method init say self~one say self~two /* output */ hello ONE hello IBM Object Rexx 2.1.3 Phil ----... | ||||||||
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#1
07-30-2008, 04:51 AM
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 Subclassing and attribute methods Hi All, Is there a limitation whereby a subclass cannot use attribute methods from the parent or is there a trick I can't find? My results return a non-initialised var, i.e., an uppercase method name. /* */ one = .one~new two = .two~new ::class one ::method one attribute ::method two return 'hello' ::method init self~one = 'hello' say self~one ::class two subclass one ::method init say self~one say self~two /* output */ hello ONE hello IBM Object Rexx 2.1.3 Phil ----  |
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#2
07-30-2008, 05:03 AM
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| Re: Subclassing and attribute methods Phil wrote: > Hi All, > Is there a limitation whereby a subclass cannot use attribute methods from > the parent or is there a trick I can't find? My results return a > non-initialised var, i.e., an uppercase method name. > > /* */ > one = .one~new > two = .two~new > > ::class one > > ::method one attribute > > ::method two > return 'hello' > > ::method init > self~one = 'hello' > say self~one > > ::class two subclass one > > ::method init > say self~one > say self~two > > /* output */ > hello > ONE > hello > > IBM Object Rexx 2.1.3 Firstly, you should upgrade to ooRexx 3.2.0 ASAP, which is newer and stabler than IBM Object Rexx, from which sources ooRexx has evolved (http://www.ooRexx.org). Secondly, you need to make sure in your subclass, that the superclass is able to run its initialization method: /* */ one = .one~new two = .two~new ::class one ::method one attribute ::method two return 'hello' ::method init self~one = 'hello' say self~one ::class two subclass one ::method init self~init:super -- <-- let superclass' initialize say self~one say self~two The output then: hello hello hello hello HTH, ---rony |
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