Macro reducer 

reducer!() { /* proc-macro */ }

The reducer! macro for creating order-independent state with dispatch.

Returns (state, dispatch) where dispatch sends actions through a reducer function to produce new state.

Examples

let (state, dispatch) = reducer!(cx, AppState::Idle, |state, action| {
    match (state, action) {
        (_, Action::Reset) => AppState::Idle,
        (s, _) => s,
    }
});

// Dispatch an action
dispatch(Action::Reset);