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* scoped_lock is now a std name with subtly different semantics compared to lock_guard. Namely it can be used to lock 0 or more mutexes. This is valuable, but can also be accidentally used to lock 0 mutexes when 1 was intended, creating a run-time error. Therefore, if and when we use scoped_lock, extra care needs to be taken in reviewing that code to ensure it doesn't accidentally lock 0 mutexes when 1 was intended. To aid in such careful reviewing, the use of the name scoped_lock should be limited to those cases where the number of mutexes is not exactly one.
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Each folder contains a single module following the newest style:
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- As much implementation hidden as possible
- All major interfaces are abstract
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