[cfe-dev] What is the StringRef equivalent of NULL?

[Peter Davies]

> Because that constructor is specified to take a non-null pointer :).  It is a hot method and doing the null check would be wasteful.
>
> -Chris

In the vast majority of cases (static argument), that cost will be
eliminated by a decent optimizer. This makes converting functions that
accept NULL in their const char * args hard to convert. Ultimately
though, it's your choice.

Peter