Defines type aliases for the given reactive domain.
#define USING_REACTIVE_DOMAIN(name)
Defines the following type aliases for the given domain name in the current scope:
template <typename S>
using SignalT = Signal<name,S>;
template <typename S>
using VarSignalT = VarSignal<name,S>;
template <typename E = Token>
using EventsT = Events<name,E>;
template <typename E = Token>
using EventSourceT = EventSource<name,E>;
using ObserverT = Observer<name>;
using ReactorT = Reactor<name>;