2007-04-10  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits (__is_function_helper): New, uses
	variadic templates.
	(is_function): Forward to the latter.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_function/is_function.cc: Add test.

From-SVN: r123695