feat(Core/Misc): Added lambda support to EventProcessor. (#9263)

src/common/Utilities/EventProcessor.h

@@ -20,8 +20,11 @@
 
 #include "Define.h"
 #include "Duration.h"
+#include "Random.h"
 
+#include "advstd.h"
 #include <map>
+#include <type_traits>
 
 class EventProcessor;
 
@@ -69,6 +72,26 @@ class BasicEvent
         uint64 m_execTime;                                  // planned time of next execution, filled by event handler
 };
 
+template<typename T>
+class LambdaBasicEvent : public BasicEvent
+{
+    public:
+        LambdaBasicEvent(T&& callback) : BasicEvent(), _callback(std::move(callback)) { }
+
+        bool Execute(uint64, uint32) override
+        {
+            _callback();
+            return true;
+        }
+
+    private:
+
+        T _callback;
+};
+
+template<typename T>
+using is_lambda_event = std::enable_if_t<!std::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
+
 typedef std::multimap<uint64, BasicEvent*> EventList;
 
 class EventProcessor
@@ -80,6 +103,14 @@ class EventProcessor
         void Update(uint32 p_time);
         void KillAllEvents(bool force);
         void AddEvent(BasicEvent* Event, uint64 e_time, bool set_addtime = true);
+        template<typename T>
+        is_lambda_event<T> AddEvent(T&& event, Milliseconds e_time, bool set_addtime = true) { AddEvent(new LambdaBasicEvent<T>(std::move(event)), e_time, set_addtime); }
+        void AddEventAtOffset(BasicEvent* event, Milliseconds offset) { AddEvent(event, CalculateTime(offset.count())); }
+        void AddEventAtOffset(BasicEvent* event, Milliseconds offset, Milliseconds offset2) { AddEvent(event, CalculateTime(randtime(offset, offset2).count())); }
+        template<typename T>
+        is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset); }
+        template<typename T>
+        is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset, Milliseconds offset2) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset, offset2); }
         void ModifyEventTime(BasicEvent* event, Milliseconds newTime);
         [[nodiscard]] uint64 CalculateTime(uint64 t_offset) const;