[R] packagename:::functionname vs. importFrom

Hadley Wickham hadley at rice.edu
Tue Jan 4 00:48:27 CET 2011

Hi Frank,

I think you mean packagename::functionname?  The three colon form is
for accessing non-exported objects.  Otherwise, I think using :: vs
importFrom is functionally identical - either approach delays package
loading until necessary.


On Mon, Jan 3, 2011 at 9:45 PM, Frank Harrell <f.harrell at vanderbilt.edu> wrote:
> In my rms package I use the packagename:::functionname construct in a number
> of places.  If I instead use the importFrom declaration in the NAMESPACE
> file would that require the package to be available, and does it load the
> package when my package loads?  If so I would keep using packagename::: to
> avoid up-front loading of other packages that are not always used.
> Thanks
> Frank
> -----
> Frank Harrell
> Department of Biostatistics, Vanderbilt University
> --
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Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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