re PR libstdc++/45228 ([C++0x] Can't copy-construct "tuple<int,int,int>" from "const tuple<int,int,int>" rvalue)

2010-08-10  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/45228
	* include/std/tuple (tuple<typename... _Elements>): Constrain
	converting constructors and assignment operators with
	sizeof...(_UElements) == sizeof...(_Elements).
	(tuple(tuple<_UElements...>&): Remove.
	(tuple<typename _T1>): Add.
	* testsuite/20_util/tuple/cons/45228.cc: New.
	* testsuite/20_util/tuple/cons/converting.cc: Likewise.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust
	dg-error line number.

	* include/std/tuple (_Tuple_impl<>::_Tuple_impl(const _Tuple_impl&)):
	Defaulted.

	* include/std/tuple (tuple<typename _T1, typename _T2>
	::operator=(pair<_U1, _U2>&&)): Use forward.

From-SVN: r163049