[cfe-dev] [PATCH] C++0x unicode string and character literals now with test cases

Craig Topper craig.topper at gmail.com
Mon Jul 25 22:52:28 PDT 2011

Doh! I accidentally warned on UCNs larger than 0xffff in UTF-32
character literals. This patch fixes that.

On Mon, Jul 25, 2011 at 9:43 PM, Craig Topper <craig.topper at gmail.com> wrote:
> Ok I've removed the defaults that I could and removed the implicit
> const conversion stuff.
> ~Craig
> On Mon, Jul 25, 2011 at 9:16 PM, Douglas Gregor <dgregor at apple.com> wrote:
>> On Jul 25, 2011, at 6:45 PM, Sean Hunt wrote:
>>> On Mon, Jul 25, 2011 at 18:36, Craig Topper <craig.topper at gmail.com> wrote:
>>>> As far as the const conversion for the new string literal types, gcc
>>>> 4.5.2 allows it and throws a warning. Looks like the standard may
>>>> consider these cases to be illegal now instead of deprecated for even
>>>> the old cases.
>>>> Google found this page which documents discussion on this topic. Look
>>>> for "693. New string types and deprecated conversion "
>>>> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n3007.html
>>>> ~Craig
>>> I think we should follow the CWG's direction here. The reason it was
>>> not added, even as a deprecated conversion, was to avoid people
>>> relying on a brand new deprecated conversion which would make it more
>>> difficult to remove later when it could have been nipped in the bud.
>>> So for consistency, the deprecated conversion for char* was removed.
>>> In my opinion, given that the committee decided on this specific
>>> issue, we should follow the committee's direction and reject this
>>> conversion, certainly for the new types but probably char* as well
>>> given the committee's explicit decision in that regard (and update the
>>> compatibility docs).
>> I have a sinking feeling that rejecting the string literal to char* conversion is going to break a lot of existing code. We'll have to do it eventually, but we'll need *excellent* recovery when we do.
>>        - Doug

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