[v3] Start on the C++0x tuple

[Paolo Carlini]

Hi,

the below adds some code contributed by Chris, with small changes:

1- Fixed the implementation of DR 705.
2- Dropped for now the efficient tuple_element, because, as-is, didn't
work with types like void and function types. Help appreciated...

Besides the last issue, help would be also appreciated for some
additional C++0x-specific testcases and for the implementation of the
missing member functions, e.g., move constructor and assignment. Just
let me know...

Tested x86_64-linux, committing to mainline.

Paolo.

////////////////////////
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: CL_tuple_0x
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20071226/6fa01370/attachment.ksh>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: patch_tuple_0x
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20071226/6fa01370/attachment-0001.ksh>