re PR libstdc++/15523 ([DR 408] Can't have vectors of vector::const_iterator)

re PR libstdc++/15523 ([DR 408] Can't have vectors of vector::const_iterator)

2009-08-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/15523
	* include/debug/safe_iterator.h (_Safe_iterator<>::
	_Safe_iterator(const _Safe_iterator&), _Safe_iterator<>::
	operator=(const _Safe_iterator&)): Implement resolution of DR 408,
	do not error out when the source is a value-initialized iterator.
	* testsuite/23_containers/vector/15523.cc: New.
	* doc/xml/manual/intro.xml: Add an entry for DR 408.

From-SVN: r150455