hashtable.h (_Hashtable<>::_M_rehash): Take and restore hash policy _M_prev_resize...

hashtable.h (_Hashtable<>::_M_rehash): Take and restore hash policy _M_prev_resize on exception.

2011-09-14  François Dumont  <fdumont@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/hashtable.h (_Hashtable<>::_M_rehash): Take and restore
	hash policy _M_prev_resize on exception.
	(_Hashtable<>::_M_insert_bucket): Capture hash policy next resize
	before using it and use latter method to have it restored on exception.
	(_Hashtable<>::_M_insert(_Arg&& __v, std::false_type): Likewise.
	(_Hashtable<>::insert(_InputIterator, _InputIterator): Likewise.
	(_Hashtable<>::rehash): Likewise.
	* testsuite/23_containers/unordered_set/insert/hash_policy.cc: New.
	* testsuite/23_containers/unordered_multiset/insert/hash_policy.cc:
	Likewise.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>
From-SVN: r178861