[Rd] A: ImportFrom(B, ...) -- B: ImportFrom(A, ...)

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Sat, 14 Jan 2012 22:54:55 +0100


If I have a package A whose NAMESPACE has  ImportFrom(B, <B-syms>))

and a package B whose NAMESPACE has
 ImportFrom(A, <A-syms>)

and we can assume that <A-syms> and <B-syms> are disjoint. The clue would be that I only import relatively little from one namespace to the other.

I currently get an error

  Error in loadNamespace(imp[[1L]], c(lib.loc, .libPaths())) :     cyclic namespace dependency detected when loading ‘A’,     already loading ‘B’, ‘A’

but isn't this an unnecessary (and too limiting) restriction?

The use case would be packages Rmpfr and gmp, both for high precision arithmetic, and it would be considerably more natural if each could import some facilities from the other, instead of having an asymmetry A --> B (or B --> A).

Martin



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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sat 14 Jan 2012 - 22:00:35 GMT

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