re PR libstdc++/45133 ([c++0x] std::future will crash with NULL deref if get() is...

re PR libstdc++/45133 ([c++0x] std::future will crash with NULL deref if get() is called twice)

2010-12-14  Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/45133
	* include/std/future (__basic_future::wait): Throw if not valid.
	(__basic_future::wait_for): Likewise.
	(__basic_future::wait_until): Likewise.
	(__basic_future::_M_get_result): Likewise.
	* testsuite/30_threads/future/members/45133.cc: New.
	* testsuite/30_threads/shared_future/members/45133.cc: New.

From-SVN: r167823