sendable swift 6

In Swift 6, the concept of "sendable" types is crucial for ensuring data race safety in concurrent programming. When migrating to Swift 6, it's important to understand that Swift does not automatically infer sendability for public types. This is because marking a type as sendable is a guarantee to your clients that the type contains no mutable state, which might change in the future. Therefore, you need to explicitly add sendable conformances to public types.

For example, if you have a public type that you want to be sendable, you can make a single line change to mark it as such, which can eliminate multiple warnings at once. This is particularly useful in large projects where there might be dozens of warnings across multiple projects.

Additionally, Swift 6 introduces a new language mode that achieves data race safety by requiring that values shared between concurrency domains are sendable. This ensures that the state is protected from concurrent accesses, which is essential for avoiding data races.

For more detailed information on sendable types and data race safety in Swift 6, you can refer to the session Migrate your app to Swift 6 (32:27).