tuple (tuple_element<__i, [...]): Add.

tuple (tuple_element<__i, [...]): Add.

2011-05-19  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/tuple (tuple_element<__i, const _Tp>,
	tuple_element<__i, volatile _Tp>, tuple_element<__i,
	const volatile _Tp>, tuple_size<const _Tp>, tuple_size<volatile _Tp>,
	tuple_size<const volatile _Tp>): Add.
	* include/std/utility (tuple_size<std::pair<_Tp1, _Tp2>>): Tweak.
	* include/std/array (tuple_size<array<_Tp, _Nm>>): Likewise.
	* testsuite/20_util/tuple/cv_tuple_size.cc: New.
	* testsuite/20_util/tuple/cv_tuple_element.cc: Likewise.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Tweak dg-warning
	line number.

From-SVN: r173919