tuple: Only include <utility> for std::pair, and forward declare reference_wrapper...

tuple: Only include <utility> for std::pair, and forward declare reference_wrapper...

2007-03-13  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/tuple: Only include <utility> for std::pair, and
	forward declare reference_wrapper; formatting fixes.
	* include/tr1/ref_fwd.h: Remove.
	* include/tr1/tuple_defs.h: Remove, unused.
	* include/Makefile.am: Update.
	* include/Makefile.in: Regenerate.
	* testsuite/tr1/6_containers/tuple/creation_functions/make_tuple.cc:
	Include <tr1/functional> too.

	* include/tr1/tuple: Define tuple_size<tuple<_Elements...> >::value.

From-SVN: r122883