[R] how to tell if as.numeric succeeds?

[Steve Jaffe]

Suppose I have a vector of strings. I'd like to convert this to a vector of
numbers if possible. How can I tell if it is possible? 

as.numeric() will issue a warning if it fails. Do I need to trap this
warning? If so, how?

In other words, my end goal is a function that takes a vector of strings and
returns either a numeric vector or the original vector. Assuming this
doesn't already exist, then to write it I'd need a function that returns
true if its input can be converted to numeric and false otherwise.

Any suggestions will be appreciated.
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