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book: resources shared with init must also be Send

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Jorge Aparicio 2019-04-16 21:54:19 +02:00
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8
book/en/src/by-example/types-send-sync.md
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@ -44,6 +44,14 @@ send operation where the initial value is sent from `idle`, which has the lowest
priority of `0`, to a task with will run with a priority greater than or equal
to `1`. Thus all late resources need to implement the `Send` trait.
Sharing a resource with `init` can be used to implement late initialization, see
example below. For that reason, resources shared with `init` must also implement
the `Send` trait.
``` rust
{{#include ../../../../examples/shared-with-init.rs}}
```
## `Sync`
Similarly, [`Sync`] is a marker trait for "types for which it is safe to share