> To summarize, it appears that the only way to call functions from a > suggested package is by using either 'require' (which will dynamically > attach it) or the double colon method. Is this something that should be > mentioned in R-exts?
Except the double colon method doesn't work (i.e. does not pass R CMD check) unless you also import the package, which means it's no longer just a suggestion - it must always be installed. A simple test case (attached DESCRIPTION and R/test.r) yields this warning on R CMD check: * checking for unstated dependencies in R code ... WARNING '::' or ':::' import not declared from: 'MASS' See the information on DESCRIPTION files in the chapter 'Creating R packages' of the 'Writing R Extensions' manual. Hadley -- Chief Scientist, RStudio http://had.co.nz/
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