future: Use base class with nested types.

future: Use base class with nested types.

2009-11-02  Benjamin Kosnik  <bkoz@redhat.com>

	* include/std/future: Use base class with nested types.
	(__future_base): New.
	(__future_base::_Result_base): From _Future_result_base.
	(__future_base::_Result): From _Future_result.
	(__future_base::_Move_result): From _Move_future_result.
	(__future_base::_Ptr): From _Future_ptr.
	(__future_base::_State): From _Future_state.
	(__basic_future): From _Future_impl.
	* testsuite/30_threads/packaged_task/cons/assign_neg.cc: Adjust line
	numbers.
	* testsuite/30_threads/packaged_task/cons/copy_neg.cc: Same.
	* testsuite/30_threads/shared_future/cons/assign_neg.cc: Same.
	* testsuite/30_threads/unique_future/cons/assign_neg.cc: Same.
	* testsuite/30_threads/unique_future/cons/copy_neg.cc: Same.
	* testsuite/30_threads/promise/cons/assign_neg.cc: Same.
	* testsuite/30_threads/promise/cons/copy_neg.cc: Same.

From-SVN: r153834