2005-01-28  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits: Implement is_empty.
	* testsuite/tr1/4_metaprogramming/type_properties/is_empty/
	is_empty.cc: New.
	* testsuite/tr1/4_metaprogramming/type_properties/is_empty/
	typedefs.cc: Likewise.

	* include/tr1/type_traits (__is_abstract_helper): Simplify a bit.

From-SVN: r94379