[PATCH] StringRef::copy should never copy empty strings

[David Blaikie via llvm-commits]

Presumably you could just "return *this" (or "return StringRef()")

Perhaps you could test that the allocator is not invoked for that copy
operation?

On Wed, Mar 23, 2016 at 11:36 AM, Pete Cooper <peter_cooper at apple.com>
wrote:

> Hi Mehdi, David
>
> This is a spin off from the discussion on Allocator.h and requesting that
> we allocate 0 bytes.
>
> Independent from whatever gets decided on Allocate behaviour, I think it
> would be best if StringRef::copy returns StringRef(nullptr, 0) whenever we
> try to copy an empty string.  StringRef(“”) would also be fine if you
> prefer.
>
> This makes that change and adds test to the unit test for the new behavior.
>
> Cheers,
> Pete
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20160323/ee473bee/attachment.html>