[v3] constexpr tuple

[Paolo Carlini]

On 09/08/2011 09:25 PM, Marc Glisse wrote:
> Or as an alternative, we could have f<3>(tuple0,tuple1,tuple2) call 
> (with proper forwarding) f<2>(tuple1,tuple2,x01,x02) which calls 
> f<1>(tuple2,x01,x02,x10,x11,x12,x13) which calls 
> f<0>(x01,x02,x10,x11,x12,x13,x20) which is what the tuple constructor 
> needs. This avoids the forward_as_tuple.
Thanks everybody for the feedback! I gather, from private email too, 
that Daniel can spend some time on tuple_cat over the next days. Great.

Me, was having a look to this code and I think it's time to get rid of 
some ints (vs std::size_ts) leftover from the TR1 functional times. 
Thus, I have the below which so far appears to work well and mean to 
commit soon, as-is or tweaked. If somebody can see something wrong with 
this kind of preliminary fix, please let me know.

Paolo.

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