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Section: 30.6.7 [futures.unique_future] Status: C++11 Submitter: Anthony Williams Opened: 2011-02-17 Last modified: 2017-02-03
Priority: Not Prioritized
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As specified, future<>::share() has the signature
shared_future<R> share() &&;
This means that it can only be applied to rvalues. One of the key benefits of share() is that it can be used with the new auto facility:
std::promise<some_long_winded_type_name> some_promise; auto f = some_promise.get_future(); // std::future auto sf = std::move(f).share();
share() is sufficiently explicit that the move should not be required. We should be able to write:
auto sf = f.share();
[2011-02-22 Reflector discussion]
Moved to Tentatively Ready after 5 votes.
Alter the declaration of share() to remove the "&&" rvalue qualifier in 30.6.7 [futures.unique_future] p. 3, and 30.6.7 [futures.unique_future] p. 11: