2010-08-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/42925
	* include/bits/unique_ptr.h (operator==(const unique_ptr<>&,
	nullptr_t), operator==(nullptr_t, const unique_ptr<>&),
	operator!=(const unique_ptr<>&, nullptr_t),
	operator!=(nullptr_t, const unique_ptr<>&)): Add.
	* include/bits/shared_ptr_base.h (operator==(const __shared_ptr<>&,
	nullptr_t), operator==(nullptr_t, const __shared_ptr<>&),
	operator!=(const __shared_ptr<>&, nullptr_t),
	operator!=(nullptr_t, const __shared_ptr<>&)): Likewise.
	* include/bits/shared_ptr.h (operator==(const shared_ptr<>&,
	nullptr_t), operator==(nullptr_t, const shared_ptr<>&),
	operator!=(const shared_ptr<>&, nullptr_t),
	operator!=(nullptr_t, const shared_ptr<>&)): Likewise.
	* testsuite/20_util/unique_ptr/comparison/42925.cc: New.
	* testsuite/20_util/shared_ptr/comparison/42925.cc: Likewise.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust
	dg-error line numbers.

From-SVN: r163094