Pass by Value for Classes

[Mike Papper]

Hello, I was wondering if there what classes can safely and
efficiently be passed by value (i..e, into functions or put onto templated
containers).

Is there a general rule for determining this (such as, if it has a copy
constructor, its safe to use in pass-by-value)?

Is this possible for:

Socket,

Thread (I would assume not, thus we would stick pointers to thread objects
into a queue to manage them)

Synchronization classes like Mutex, AtomicLock, Semaphore, Event, Conditional
etc.

--
Mike Papper
Fantastic
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