R S4 .Data inheritance error -

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i have 3 packages, pkga (defines class 'a'), pkgb (defines class 'b') & pkgc (defines class 'c' , class 'broken'). inheritance diagram looks this:

pkga        class                |             ---------             |       | pkgb    class b     |             |       | pkgc    class c   class broken

the definition of 'broken' is:

setclass('broken', representation('a', content = 'list'))

when try create new one, error:

> library(pkgc) > new('broken', content = list())  error in validobject(.object) :    invalid class “broken” object: error in getdatapart(<s4 object of class structure("broken", package = "pkgc")>) :    data part undefined general s4 object

does know going on? else able reproduce problem?

i noticed that:

> getclass('broken') class "broken" [package "pkgc"]  slots:  name:    .data content class:          list  extends:  class "a", data part

contains .data part, think wrong. has come from? why there? bug in setclass?

to produce problem, required following files (which available in small github repository here: http://github.com/bluewomble/inheritance_problem)

pkga

pkga/r/classes.r

setclass('a', representation('virtual'))

pkga/namespace

exportclass(a)

pkga/description

package: pkga type: package title: test package version: 1.0 date: 2014-03-20 author: n other maintainer: n other <another@dev.null> description: test license: gpl depends:     methods collate:     classes.r

pkgb

pkgb/r/classes.r

setclass('b', representation('a'))

pkgb/namespace

exportclass(b) importclassesfrom(pkga,a)

pkgb/description

package: pkgb type: package title: test package b version: 1.0 date: 2014-03-20 author: n other maintainer: n other <another@dev.null> description: test license: gpl depends:     methods,     pkga collate:    classes.r

pkgc

pkgc/r/classes.r

setclass('c', representation('b'))  setclass('broken', representation('a', content = 'list'))

pkgc/namespace

exportclass(c) exportclass(broken) importclassesfrom(pkga,a) importclassesfrom(pkgb,b)

pkgc/description

package: pkgc type: package title: test package c version: 1.0 date: 2014-03-20 author: n other maintainer: n other <another@dev.null> description: test license: gpl depends:     methods,     pkga,     pkgb collate:     classes.r

i'm using r 3.0.2 on ubuntu.


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