[libstdc++ PATCH] Implement observer_ptr

[Jonathan Wakely]

On 01/05/15 22:01 +0100, Jonathan Wakely wrote:
>On 01/05/15 16:37 +0300, Ville Voutilainen wrote:
>>Tested on Linux-x64.
>>
>>   Implement observer_ptr.
>
>Thanks! Committed with some minor formatting changes.
>
>I've also committed this to add feature-test macros and update the
>docs. Tested powerpc64le-linux, committed to trunk.

Thanks to Ville for pointing out that I put the wrong macro. Doh.

Committed to trunk.
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