Suppose I have a function funcA() in package pkgA that requires function
funcB() from another package pkgB under certain circumstances. Those
circumstances are rare though, so I put package pkgB under 'Suggests', and use
this in funcA() when those circumstances do arise:
if (require("pkgB", quietly=TRUE)) {
pkgB::funcB(...)
} else {
stop("Please install package 'pkgB' to do this.")
}
I understand that using requireNamespace() would be preferable and I would also
prefer to do that. But funcB() depends on funcC() from pkgC that it lists under
'Depends'. So, with require("pkgB"), both namespaces (of pkgB and pkgC) are
loaded and attached to the search list and things run. But with
requireNamespace("pkgB"), only the namespace of pkgB is loaded, so funcC()
can't be found. So, I figured, I also use requireNamespace("pkgC"), but that's
not sufficient, since funcB() calls funcC() and not pkgC::funcC().
Is there any solution to this?
Best,
Wolfgang
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