From c14cf5a892f62a8700d1a6ccde102549bde1be8e Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Fri, 15 Feb 2019 21:32:07 +0100
Subject: Core/Misc: Added lambda support to EventProcessor

Closes #22909

(cherry picked from commit 813f693768ee94864b0d24423b9265bde2c9903d)
---
 src/common/Utilities/EventProcessor.h | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

(limited to 'src/common/Utilities/EventProcessor.h')

diff --git a/src/common/Utilities/EventProcessor.h b/src/common/Utilities/EventProcessor.h
index 11ca046bd18..8da9c47a19f 100644
--- a/src/common/Utilities/EventProcessor.h
+++ b/src/common/Utilities/EventProcessor.h
@@ -20,8 +20,9 @@
 
 #include "Define.h"
 #include "Duration.h"
-#include <map>
 #include "Random.h"
+#include "advstd.h"
+#include <map>
 
 class EventProcessor;
 
@@ -69,6 +70,26 @@ class TC_COMMON_API 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<!advstd::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
+
 class TC_COMMON_API EventProcessor
 {
     public:
@@ -78,8 +99,14 @@ class TC_COMMON_API 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, uint64 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(urand(offset.count(), 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, uint64 newTime);
         uint64 CalculateTime(uint64 t_offset) const { return m_time + t_offset; }
         std::multimap<uint64, BasicEvent*> const& GetEvents() const { return m_events; }
-- 
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