pub unsafe auto trait Send { }Types that can be transferred across thread boundaries.
This trait is automatically implemented when the compiler determines itâs appropriate.
An example of a non-Send type is the reference-counting pointer rc::Rc. If two threads attempt to clone Rcs that point to the same reference-counted value, they might try to update the reference count at the same time, which is undefined behavior because Rc doesnât use atomic operations. Its cousin sync::Arc does use atomic operations (incurring some overhead) and thus is Send.
See the Nomicon and the Sync trait for more details.
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