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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@94379 138bc75d-0d04-0410-961f-82ee72b054a4