Attribute Macro shared 

#[shared]

Transforms a struct into a shared, cheaply-cloneable wrapper.

Always generates:

• XxxInner with each field wrapped in Mutex<T> or stored raw
• Xxx(Arc<XxxInner>) with Clone = Arc::clone
• Xxx::new(...) constructor
• Per-field async accessors

Field attributes:

• (default) Mutex<T>, generates async fn field() -> MutexGuard<T>
• #[raw] stored as-is, generates fn field() -> &T