Continuing the thread started on R-package-devel, here:
https://stat.ethz.ch/pipermail/r-package-devel/2023q3/009307.html
The logic of the now soft-deprecated as.data.frame.<class>,
> body(as.data.frame.integer)[[2L]]
if ((sys.nframe() <= 1L || sys.call(-1L)[[1L]] != quote(as.data.frame)) &&
nzchar(Sys.getenv("_R_CHECK_AS_DATA_FRAME_EXPLICIT_METHOD_")))
.Deprecated(msg = gettextf("Direct call of '%s()' is deprecated. Use '%s()' or
'%s()' instead",
"as.data.frame.integer", "as.data.frame.vector", "as.data.frame"))
may need adjustment to avoid false positives such as this one:
> Sys.setenv("_R_CHECK_AS_DATA_FRAME_EXPLICIT_METHOD_" = TRUE)
> f <- as.data.frame
> f(0L)
0L
1 0
Warning message:
Direct call of 'as.data.frame.integer()' is deprecated. Use
'as.data.frame.vector()' or 'as.data.frame()' instead
i.e., the condition sys.call(-1L)[[1L]] != quote(as.data.frame) is not precise
enough ... would !identical(sys.function(-1L), as.data.frame) work instead?
Mikael
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