2003-11-13  Douglas Gregor  <gregod@cs.rpi.edu>

	* docs/html/debug.html: Users are allowed to specialize in
	namespace __gnu_debug, unlike in the Apple version of the debug
	mode. Clear up a confusing double-negative. Note that
	std::basic_string does provide extra debugging capabilities, but
	not safe iterators.
	* include/bits/basic_string.tcc: Make sure there's never an
	ambiguity when calling __is_null_pointer.
	* include/debug/deque: (deque::erase) Properly handle invalidation
	when erasing at the end of the deque.
	* include/debug/vector: (vector::swap): Swap _M_guaranteed_capacity.
	(vector::clear): Set the guaranteed capacity to 0.
	* testsuite/23_containers/deque/invalidation/4.cc: (test04): Test
	iterator invalidation when erasing at the end of the deque.

From-SVN: r73564