Determine function type.
This function figures out whether the input function is a regular/primitive/internal function, a internal/S3/S4 generic, or a S3/S4/RC method. This is function is slightly simplified as it's possible for a method from one class to be a generic for another class, but that seems like such a bad idea that hopefully no one has done it.
ftype(f)
f |
unquoted function name |
a character of vector of length 1 or 2.
ftype(`%in%`) ftype(sum) ftype(t.data.frame) ftype(t.test) # Tricky! ftype(writeLines) ftype(unlist)
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