[libstdc++ PATCH] Implement observer_ptr

[Jonathan Wakely]

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.


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