Minor Demo Tweaks

Update some naming of objects and output messages. Also added example of class that holds a handler_registration as a member variable.

demo/main.cpp

@@ -21,43 +21,55 @@ struct third_event
     double value{ 234.00 };
 };
 
-void foo(const first_event& evt)
+void free_function_event_handler(const first_event& evt)
 {
     std::cout << "event: " << evt.message << std::endl;
 }
 
-class my_callback_object
+class first_event_callback_object
 {
 public:
-    my_callback_object() = default;
+    first_event_callback_object() = default;
     void on_event_fired(const first_event&) { event_count_++; }
     void on_third_event() {};
     [[nodiscard]] int get_event_count() const { return event_count_; }
 private:
     int event_count_{ 0 };
 };
 
-class third_event_object
+class third_event_callback_object
 {
 public:
     void on_third_event() {};
 };
 
+class internal_registration_class {
+    dp::handler_registration reg;
+public:
+    internal_registration_class(dp::event_bus& bus) : reg(std::move(bus.register_handler<first_event>([](const first_event& evt) {
+        std::cout << "test class: " << evt.message << "\n";
+        }))) {
+
+    }
+};
+
 int main()
 {
     using namespace dp;
     event_bus evt_bus;
-    my_callback_object callback_obj;
 
-    const auto reg = evt_bus.register_handler<first_event>(&foo);
+    // register free function
+    const auto reg = evt_bus.register_handler<first_event>(&free_function_event_handler);
     const auto third_event_reg = evt_bus.register_handler<third_event>([](const third_event& evt)
     {
             std::cout << "my third event handler: " << evt.value << new_line;
     });
 
-    const auto empty_event_handler = evt_bus.register_handler<third_event>([]() {std::cout << "I just do stuff when a third_event is fired." << new_line; });
+    const auto third_event_reg_2 = evt_bus.register_handler<third_event>([]() {std::cout << "I just do stuff when a third_event is fired." << new_line; });
 
-    first_event evt{ "hello from dummy event" };
+    internal_registration_class test_object(evt_bus);
+
+    first_event evt{ "hello from first event" };
     evt_bus.fire_event(evt);
     evt_bus.fire_event(third_event{ 13.0 });
     evt_bus.remove_handler(third_event_reg);
@@ -67,32 +79,35 @@ int main()
     const auto other_event_reg = evt_bus.register_handler<second_event>([](const second_event& other_evt) {std::cout << "first other event handler says: " << other_evt.message << std::endl; });
     const auto other_event_second_reg = evt_bus.register_handler<second_event>([](const second_event& other_evt){std::cout << "second other event handler says: " << other_evt.id << " " << other_evt.message << std::endl;});
     const auto dmy_evt_first_reg = evt_bus.register_handler<first_event>([](const first_event& dmy_evt) {std::cout << "third event handler says: " << dmy_evt.message << std::endl;});
-    const auto dmy_evt_pmr_reg = evt_bus.register_handler<first_event>(&callback_obj , &my_callback_object::on_event_fired);
-    const auto thrid_event_reg_pmr = evt_bus.register_handler<third_event>(&callback_obj, &my_callback_object::on_third_event);
+
+    first_event_callback_object callback_obj;
+    const auto dmy_evt_pmr_reg = evt_bus.register_handler<first_event>(&callback_obj , &first_event_callback_object::on_event_fired);
+    const auto thrid_event_reg_pmr = evt_bus.register_handler<third_event>(&callback_obj, &first_event_callback_object::on_third_event);
 
     // the following does not compile
     // third_event_object teo;
     // const auto rg = evt_bus.register_handler<third_event>(&teo, &my_callback_object::on_third_event);
 
-    second_event other_evt{ 2, "hello there" };
-    first_event dmy_event{ "oh boy..." };
+    second_event snd_evt{ 2, "hello there from second event" };
+    first_event first_evt{ "another first event" };
 
-    evt_bus.fire_event(dmy_event);
+    evt_bus.fire_event(first_evt);
 
-    std::cout << "Firing other event\n";
-    evt_bus.fire_event(other_evt);
+    std::cout << "Firing second event\n";
+    evt_bus.fire_event(snd_evt);
     evt_bus.remove_handler(other_event_reg);
-    std::cout << "Firing other event\n";
-    evt_bus.fire_event(other_evt);
+    std::cout << "Firing second and third event\n";
+    evt_bus.fire_event(snd_evt);
     evt_bus.fire_event(third_event{});
 
     std::cout << "callback count: " << callback_obj.get_event_count() << std::endl;
     std::cout << "handler count: " << evt_bus.handler_count() << "\n";
     std::cout << "removing handlers..." << "\n";
 
+    // this is optional as the handler registrations are RAII objects
     evt_bus.remove_handler(reg);
     evt_bus.remove_handler(other_event_second_reg);
-    evt_bus.remove_handler(empty_event_handler);
+    evt_bus.remove_handler(third_event_reg_2);
     evt_bus.remove_handler(dmy_evt_first_reg);
     evt_bus.remove_handler(dmy_evt_pmr_reg);
     evt_bus.remove_handler(thrid_event_reg_pmr);