bool valid() const noexcept;
(since C++11)Checks if the future refers to a shared state.
This is the case only for futures that were not default-constructed or moved from (i.e. returned by std::promise::get_future(), std::packaged_task::get_future() or std::async()) until the first time get() or share() is called.
The behavior is undefined if any member function other than the destructor, the move-assignment operator, or valid
is called on a future
that does not refer to shared state (although implementations are encouraged to throw std::future_error indicating no_state
in this case). It is valid to move from a future object for which valid()
is false.
(none)
[edit] Return valuetrue if *this refers to a shared state, otherwise false.
[edit] Example [edit] See also waits for the result to become availableRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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