Fixed OS EventHandler compilation issue

core/src/utils/event.h

@@ -0,0 +1,44 @@
+#pragma once
+#include <vector>
+#include <spdlog/spdlog.h>
+
+template <class T>
+struct EventHandler {
+    EventHandler() {}
+    EventHandler(void (*handler)(T, void*), void* ctx) {
+        this->handler = handler;
+        this->ctx = ctx;
+    }
+
+    void (*handler)(T, void*);
+    void* ctx;
+};
+
+template <class T>
+class Event {
+public:
+    Event() {}
+    ~Event() {}
+
+    void emit(T value) {
+        for (auto const& handler : handlers) {
+            handler.handler(value, handler.ctx);
+        }
+    }
+
+    void bindHandler(const EventHandler<T>& handler) {
+        handlers.push_back(handler);
+    }
+
+    void unbindHandler(const EventHandler<T>& handler) {
+        if (handlers.find(handler) == handlers.end()) {
+            spdlog::error("Tried to remove a non-existant event handler");
+            return;
+        }
+        handlers.erase(std::remove(handlers.begin(), handlers.end(), handler), handlers.end());
+    }
+
+private:
+    std::vector<EventHandler<T>> handlers;
+
+};