v1.4.4

source/application/discord/event.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <functional>
+#include <vector>
+
+namespace discord {
+
+template <typename... Args>
+class Event final {
+public:
+    using Token = int;
+
+    Event() { slots_.reserve(4); }
+
+    Event(Event const&) = default;
+    Event(Event&&) = default;
+    ~Event() = default;
+
+    Event& operator=(Event const&) = default;
+    Event& operator=(Event&&) = default;
+
+    template <typename EventHandler>
+    Token Connect(EventHandler slot)
+    {
+        slots_.emplace_back(Slot{nextToken_, std::move(slot)});
+        return nextToken_++;
+    }
+
+    void Disconnect(Token token)
+    {
+        for (auto& slot : slots_) {
+            if (slot.token == token) {
+                slot = slots_.back();
+                slots_.pop_back();
+                break;
+            }
+        }
+    }
+
+    void DisconnectAll() { slots_ = {}; }
+
+    void operator()(Args... args)
+    {
+        for (auto const& slot : slots_) {
+            slot.fn(std::forward<Args>(args)...);
+        }
+    }
+
+private:
+    struct Slot {
+        Token token;
+        std::function<void(Args...)> fn;
+    };
+
+    Token nextToken_{};
+    std::vector<Slot> slots_{};
+};
+
+} // namespace discord