class condition_variable_any;
(since C++11)The condition_variable_any class is a generalization of std::condition_variable. Whereas std::condition_variable works only on std::unique_lock<std::mutex>, condition_variable_any can operate on any lock that meets the BasicLockable requirements.
See std::condition_variable for the description of the semantics of condition variables.
The class std::condition_variable_any is a StandardLayoutType. It is not CopyConstructible, MoveConstructible, CopyAssignable, or MoveAssignable.
If the lock is std::unique_lock<std::mutex>, std::condition_variable may provide better performance.
[edit] Member functions constructs the objectstd::condition_variable_any can be used with std::shared_lock in order to wait on a std::shared_mutex in shared ownership mode.
A possible use for std::condition_variable_any with custom Lockable types is to provide convenient interruptible waits: the custom lock operation would both lock the associated mutex as expected, and also perform the necessary setup to notify this condition variable when the interrupting signal is received.[1]
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