[Rd] setClass accepts slot-mismatch between slots and prototype arguments

William Dunlap wdunl@p @ending from tibco@com
Thu Jan 10 17:30:00 CET 2019

I was installing the 'diffobj' package into TERR and got an error from the
StyleSummary <- setClass("StyleSummary",
  slots=c(container="ANY", body="ANY", map="ANY"),
    container=function(x) sprintf("\n%s\n", paste0(x, collapse="")),
    detail=function(x) sprintf("\n%s\n", paste0("  ", x, collapse="")),
    map=function(x) sprintf("\n%s", paste0("  ", x, collapse="\n"))
because the prototype contained components not in the slots list.  R does
not complain about the mismatch, but new("StyleSummary") does name make
something with a 'detail' slot.  Should this be an error?

I suspect that the package writer intended to include 'detail' in the slots

Bill Dunlap
TIBCO Software
wdunlap tibco.com

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