[Rd] all.equal on external pointers and environments

From: Martin Morgan <mtmorgan_at_fhcrc.org>
Date: Wed, 05 Sep 2012 13:50:19 -0700

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


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?


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