Macro callback_blueprint 

macro_rules! callback_blueprint {
    ($name:ident, Context = $ctx:ty, Event = $event:ty, Params = $params:ty) => { ... };
}

Declares a callback CallbackBlueprint key struct.

Examples

callback_blueprint!(OnConn, Context = ConnState, Event = u32, Params = (ResMut<'static, u64>,));