MiraiBot 增强对 Method Chaining 的支持

Author: cyanray

examples/FetchEventsViahHTTP.cpp

@@ -24,19 +24,17 @@ int main()
 	}
 	cout << "成功登录 bot。" << endl;
 
-	bot.OnEventReceived<GroupMessage>(
+	bot.On<GroupMessage>(
 		[&](GroupMessage gm)
 		{
 			gm.QuoteReply(gm.MessageChain);
-		});
-
-	bot.OnEventReceived<FriendMessage>(
+		})
+		.On<FriendMessage>(
 		[&](FriendMessage fm)
 		{
 			fm.Reply("你好呀, " + fm.MessageChain);
-		});
-
-	bot.OnEventReceived<TempMessage>(
+		})
+		.On<TempMessage>(
 		[&](TempMessage tm)
 		{
 			tm.Reply(tm.MessageChain);
@@ -50,7 +48,7 @@ int main()
 			cout << "轮询事件时出错: " << errMsg << endl;
 		});
 
-	// 默认参数是在 cerr 输出错误
+	// 无参数则会在 cerr 输出错误
 	// bot.EventLoop();
 
 	return 0;

include/mirai_bot.hpp

@@ -63,12 +63,12 @@ namespace Cyan
 		FriendMessage GetFriendMessageFromId(MessageId mid);
 		GroupMessage GetGroupMessageFromId(MessageId mid);
 		template<typename T>
-		void On(const EventProcessor<T>& ep)
+		MiraiBot& On(const EventProcessor<T>& ep)
 		{
-			OnEventReceived<T>(ep);
+			return OnEventReceived<T>(ep);
 		}
 		template<typename T>
-		void OnEventReceived(const EventProcessor<T>& ep);
+		MiraiBot& OnEventReceived(const EventProcessor<T>& ep);
 		void inline static SleepSeconds(int sec)
 		{
 			std::this_thread::sleep_for(std::chrono::seconds(sec));
@@ -107,14 +107,15 @@ namespace Cyan
 	};
 
 	template<typename T>
-	inline void MiraiBot::OnEventReceived(const EventProcessor<T>& ep)
+	inline MiraiBot& MiraiBot::OnEventReceived(const EventProcessor<T>& ep)
 	{
 		processors_.insert({ GetEventType<T>(),
 			[=](WeakEvent we)
 			{
 				ep(*(std::dynamic_pointer_cast<T>(we)));
 			}
 			});
+		return *this;
 	}
 
 	template<typename T>