[cfe-commits] std::nullptr_t support in MS headers

[João Matos]

Hi Howard.

The last patch adds a new guard to check for _MSC_EXTENSIONS, so it
should not interfere with any other platforms.

On Sat, Jun 23, 2012 at 3:20 AM, Howard Hinnant <hhinnant at apple.com> wrote:
> On Jun 22, 2012, at 9:49 PM, João Matos wrote:
>
>> Ping.
>>
>> On Wed, Jun 20, 2012 at 1:56 PM, João Matos <ripzonetriton at gmail.com> wrote:
>>> This patch defines nullptr_t in the standard namespace. MS does it in
>>> stddef.h, and some standard headers (<exception>, pulled by
>>> <iostream>) expect it to be there. This is needed for a simple C++
>>> hello world to be compiled in C++11 mode.
>>>
>>> --
>>> João Matos
>
> My only request/comment is that this not come into play if clang is being used on an Apple platform.
>
> libc++ has its own definition of nullptr_t in <cstddef>.  It does not export std::nullptr_t to ::nullptr_t.
>
> 18.2 [support.types] states that that the addition of std::nullptr_t to <cstddef> is a change with respect to <stddef.h>.  I.e. #include'ing <stddef.h> should not introduce std::nullptr_t nor ::nullptr_t.
>
> Howard
>



-- 
João Matos