[Rd] .Internal(inspect(x)) gives overly verbose output for reference classes
murdoch.duncan at gmail.com
Wed Mar 7 16:37:58 CET 2012
On 12-03-07 9:52 AM, Richard Cotton wrote:
> Even for an extremely simple instance of a reference class
> x<- setRefClass("x")
> y<- x$new()
> calling the internal inspect function
> produces enough output that it takes several minutes to print to the
> console. (Actually I gave up and terminated the command after ~10
> mins. It isn't clear whether the output would eventually complete.)
> Are reference classes really so complicated inside, or is this a bug?
If you look at the output, you'll see it's looping. When I hit Esc, I
saw that .self is an S4SXP with an attribute .xData which is an
environment containing the same .self, ad infinitum.
So I'd say it's a bug in inspect(). It can handle the case of an
environment holding itself, but I think it was written before S4SXPs
contained themselves, and it looks like it's not checking for that.
I'll take a look if someone else doesn't get there first...
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