FAQ
For an external pointer
xp
<pointer: (nil)>

one might expect all.equal to behave as for environments
e = new.env()
all.equal(e, e)
[1] TRUE

but it does not
all.equal(xp, xp)
Error in unclass(target) : cannot unclass an external pointer

A solution is to dispatch to all.equal.language (?) in

src/library/base/R/all.equal.R:26

but this requires an is.expternalptr primitive.

In some respects, one might expect all.equal for environments to be more
thorough

e = new.env(); e[["a"]] = 1
all.equal(e, new.env()) ## expect FALSE, as in next line
all.equal(as.list(e), as.list(new.env()))
all.equal(new.env(), new.env()) ## TRUE; ok?

Martin
--
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109

Location: Arnold Building M1 B861
Phone: (206) 667-2793

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