Macro dyn_context::State

macro_rules! State {
    (() $vis : vis struct $name : ident $($body : tt) *) => { ... };
    (() $vis : vis enum $name : ident $($body : tt) *) => { ... };
    (@ impl [$name : ident] [$($g : tt) *] [$($r : tt) *] [$($w : tt) *]
 $($body : tt) *) => { ... };
}

A macro attribute deriving trivial State implementation. A trivial-implemented state is a state containing itself only.

Examples

macro_attr! {
    #[derive(State!)]
    struct SomeData {
        data: u16,
    }
}

fn get_data_from_state(state: &dyn State) -> u16 {
    let some_data: &SomeData = state.get();
    some_data.data
}

let some_data = SomeData { data: 7 };
let data_from_state = get_data_from_state(&some_data);
assert_eq!(data_from_state, 7);