Jonathan Wakely 1f53367fb5 libstdc++: Add static assertions to futures and promises [LWG 3458] ... LWG recently decided it should be ill-formed to instantiate std::future and std::shared_future for types that can't be returned from a function. This adds static assertions to enforce it (std::future already failed, but this makes the error more understandable). LWG 3466 extends that to std::promise. The actual constraint is that t.~T() is well-formed for the primary template, but rejecting arrays and functions as done for futures matches that condition. libstdc++-v3/ChangeLog: * include/std/future (future, shared_future, promise): Add static assertions to the primary template to reject array and function types. * testsuite/30_threads/future/requirements/lwg3458.cc: New test. * testsuite/30_threads/promise/requirements/lwg3466.cc: New test. * testsuite/30_threads/shared_future/requirements/lwg3458.cc: New test.		2020-07-22 20:11:00 +01:00
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cons	Update copyright years.	2020-01-01 12:51:42 +01:00
members	libstdc++: Define and use chrono::is_clock for C++20	2020-03-25 22:07:02 +00:00
requirements	libstdc++: Add static assertions to futures and promises [LWG 3458]	2020-07-22 20:11:00 +01:00