A type L meets the TimedLockable requirements if it meets the Lockable requirements and the following expressions are well-formed and have the specified semantics (m denotes a value of type L, rel_time denotes a value of an instantiation of duration ([time.duration]), and abs_time denotes a value of an instantiation of time_point ([time.point])).
m.try_lock_for(rel_time)
Effects: attempts to acquire a lock for the current execution agent within the relative timeout ([thread.req.timing]) specified by rel_time. The function shall not return within the timeout specified by rel_time unless it has obtained a lock on m for the current execution agent. If an exception is thrown then a lock shall not have been acquired for the current execution agent.
Returns: true if the lock was acquired, false otherwise.
m.try_lock_until(abs_time)
Effects: attempts to acquire a lock for the current execution agent before the absolute timeout ([thread.req.timing]) specified by abs_time. The function shall not return before the timeout specified by abs_time unless it has obtained a lock on m for the current execution agent. If an exception is thrown then a lock shall not have been acquired for the current execution agent.
Returns: true if the lock was acquired, false otherwise.
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