2010-08-31 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/44480
* include/bits/hashtable.h (_Hashtable<>::_M_begin_bucket_index):
Add, caching the index of the first non-empty bucket.
(begin, cbegin): Use it.
(_Hashtable<>::_Hashtable(_InputIterator, _InputIterator, ...),
_Hashtable(const _Hashtable&), _Hashtable(_Hashtable&&),
swap(_Hashtable&), clear): Adjust.
(_M_insert_bucket, _M_insert, erase(const_iterator),
erase(const key_type&), _M_rehash): Update it.
* include/bits/hashtable.h (_Hashtable<>::_M_erase): Remove.
(erase(const_iterator)): Inline the latter.
From-SVN: r163686
