1 files changed, 38 insertions, 0 deletions
diff --git a/game/activity.h b/game/activity.h
new file mode 100644
index 0000000..33c36fd
--- /dev/null
+++ b/game/activity.h
@@ -0,0 +1,38 @@
+#ifndef ACTIVITY_H
+#define ACTIVITY_H
+
+#include <game/worldobject.h>
+#include <memory>
+#include <special_members.hpp>
+
+class Vehicle;
+
+class Activity {
+public:
+	Activity() = default;
+	DEFAULT_MOVE_COPY(Activity);
+	virtual ~Activity() = default;
+
+	virtual void apply(Vehicle *, TickDuration) const = 0;
+
+	template<typename T> class Of;
+};
+using ActivityPtr = std::unique_ptr<Activity>;
+
+template<typename T> concept ActivityConcept = std::is_base_of_v<Activity, T>;
+template<ActivityConcept AC> class Can {
+public:
+	virtual void doActivity(const AC *, TickDuration) = 0;
+};
+
+template<typename T> class Activity::Of : public Activity {
+	void
+	apply(Vehicle * v, TickDuration dur) const override
+	{
+		if (auto tv = dynamic_cast<Can<T> *>(v)) {
+			tv->doActivity(static_cast<const T *>(this), dur);
+		}
+	}
+};
+
+#endif