[C++0x] add rvalue support to std::function

[Paolo Carlini]

On 11/30/2009 09:42 AM, Jonathan Wakely wrote:
> OK, thanks, Paolo.  I'll continue working on the other bits later today.
>   

Done with the below.

I'll try to make progress on the Segmentation fault, I wonder if it's
really a new problem, I can see in Bugzilla a few Seg faults... Anyway,
just as a minor additional data point, Seg faults even without declval...

Paolo.

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