Example 1: Templated events

This example show a very simple way to use templated events:

  template <typename T>
  class TEvent: public Event {
  public:
    TEvent(const T& t): t_(t){}
    const T& t() const {return t_ ;}
  private:
    T t_ ;
  } ;

  class S: public Subscriber {
  public:
    template <typename T>
    void receives_event(TEvent<T>* e) {
      std::cerr << "receives " << typeid(T).name() << ": " << e->t() << std::endl ;
    }
  } ;

  int main() {
    Publisher p ;
    S s ;

    igs_connect(&p, &s, igs_functor(&s, S::receives_event<double>)) ;
    igs_connect(&p, &s, igs_functor(&s, S::receives_event<std::string>)) ;
    p.igs_emit(TEvent<double>(1.23)) ;
    p.igs_emit(TEvent<int>(123)) ;
    p.igs_emit(TEvent<std::string>("Hello World")) ;

    std::cerr << std::endl ;
    
    igs_disconnect(&p, &s, igs_functor(&s, S::receives_event<double>)) ;
    igs_disconnect(&p, &s, igs_functor(&s, S::receives_event<std::string>)) ;
    igs_connect(&p, &s, igs_functor(&s, S::receives_event<int>)) ;
    p.igs_emit(TEvent<double>(1.23)) ;
    p.igs_emit(TEvent<int>(123)) ;
    p.igs_emit(TEvent<std::string>("Hello World")) ;
  }

Will print:

  S   receives d: 1.23
  S   receives Ss: Hello World

  S   receives i: 123