In the following session we define an xx class and a print method
for it. If I invoke it with print then it prints as expected but if
we just type xx at the R prompt then we get nothing back. How
do we define the print method so that it works in the latter
case too?
> xx <- structure("abc", class = "xx")
> print.xx <- function(x, ...) shQuote(x)
> print(xx) # ok
[1] "\"abc\""
> xx # no output ????
>
> sessionInfo()
R version 2.2.1, 2005-12-20, i386-pc-mingw32
attached base packages:
[1] "methods" "stats" "graphics" "grDevices" "utils" "datasets"
[7] "base"
>
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