Implementation of forward_list (and compressed_pair)

[Paolo Carlini]

Paolo Carlini wrote:
> Ah! I think this is right! And, I must say, I'm "guilty" of having
> sidetracked Ed to the issue of having a pair of allocators stored for
> efficiency. Now I see that indeed thanks to the new variadic
> allocator::construct one can construct in place using the same node
> allocator (provided one adds an appropriate constructor for the node as
> you are doing above).
>   
To wit, this kind of patch appear to work well for std::list.

Paolo.

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