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

[Chris Lattner]

On Aug 17, 2010, at 11:38 AM, Peter Davies wrote:

>>> So why does StringRef(NULL) segfault?
>> 
>> IIRC, because it calls strlen(NULL).
> 
> To better phrase the question, why doesn't it check and return
> StringRef() in that case?

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