re PR libstdc++/49668 ([C++0x] std::thread does not forward its args as rvalues)

re PR libstdc++/49668 ([C++0x] std::thread does not forward its args as rvalues)

2011-07-09  Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/49668
	* include/std/functional (__bind_simple): Define.
	* include/std/future (_Task_setter): Parameterize by type of result
	pointer instead of state object.
	(_S_task_setter): Type deduction helper.
	(_Task_state): Use _S_task_setter and __bind_simple.
	(_Deferred_state, _Async_state): Store call wrapper directly not as
	std::function. Use _S_task_setter and __bind_simple.
	(_S_make_deferred_state, _S_make_async_state): Type deduction helpers.
	(async): Use new functions and __bind_simple.
	* include/std/mutex (call_once): Use __bind_simple.
	* include/std/thread (thread): Likewise. Remove unused headers.
	* src/thread.cc: Add header.
	* testsuite/30_threads/async/49668.cc: New.
	* testsuite/30_threads/call_once/49668.cc: New.
	* testsuite/30_threads/thread/cons/49668.cc: New.
	* testsuite/30_threads/thread/cons/moveable.cc: Remove unused bool.

From-SVN: r176073