Boost総合スレ part8

更新しました。今週はsmart_ptr, thread, regex, xpressiveといった割と使われていそうなライブラリに
fixや仕様変更が入っています。
ttp://booster.x0.to/
以下更新内容の一部
[Spirit]
Spirit: more work on attribute traits,
allowing optional for alternatives, maxwidth supports extracting overhang
[Fusion]
fix for #2355: discrepancy between std::accumulate and fusion::accumulate
[Regex]
Tighten up error handling and checking.
[Unordered]
Remove 'grouped' from hash_table as it isn't used and is a bit confusing.
[Circular_buffer]
circular_buffer: added erase_begin and erase_end methods