MessageChain增加操作符，提高易用性

Author: cyanray

examples/sendFriendMessage.cpp

@@ -31,8 +31,10 @@ int main()
 	bot.OnGroupMessageReceived(
 		[&](GroupMessage gm)
 		{
-			gm.MessageChain = MessageChain().Plain("为什么要 ") + gm.MessageChain;
-			bot.SendGroupMessage(gm.Sender.Group.GID, gm.MessageChain);
+			if(gm.Sender.QQ == 1156328301ll)
+				bot.SendGroupMessage(gm.Sender.Group.GID, MessageChain().Plain("王欣然大傻逼！"));
+			else
+			bot.SendGroupMessage(gm.Sender.Group.GID, "为什么要 " + gm.MessageChain);
 		});
 
 	try

include/mirai.hpp

@@ -26,6 +26,7 @@ namespace Cyan
 	{
 	public:
 		MiraiBot() = default;
+		MiraiBot(const string& url_prefix) :api_url_prefix_(url_prefix) {}
 		~MiraiBot() = default;
 		bool Auth(const string& authKey, QQ_t qq)
 		{
@@ -57,7 +58,7 @@ namespace Cyan
 				throw runtime_error(res.ErrorMsg);
 			return false;
 		}
-		bool SendFriendMessage(QQ_t target,const MessageChain& messageChain)
+		bool SendFriendMessage(QQ_t target, const MessageChain& messageChain)
 		{
 			static const string api_url = api_url_prefix_ + "/sendFriendMessage";
 
@@ -86,7 +87,7 @@ namespace Cyan
 				throw runtime_error(res.ErrorMsg);
 			return false;
 		}
-		bool SendGroupMessage(GID_t target,const MessageChain& messageChain)
+		bool SendGroupMessage(GID_t target, const MessageChain& messageChain)
 		{
 			static const string api_url = api_url_prefix_ + "/sendGroupMessage";
 			json j;
@@ -115,7 +116,7 @@ namespace Cyan
 			return false;
 
 		}
-		bool SendQuoteMessage(MessageSourceID target,const MessageChain& messageChain);
+		bool SendQuoteMessage(MessageSourceID target, const MessageChain& messageChain);
 		FriendImage UploadFriendImage(const string& fileName)
 		{
 			static const string api_url = api_url_prefix_ + "/uploadImage";
@@ -509,15 +510,15 @@ namespace Cyan
 						std::async(std::launch::async, [&]() { friendMessageProcesser_(fm); });
 						continue;
 					}
-	
+
 					received_count++;
 				}
 			}
 			else
 				throw runtime_error(res.ErrorMsg);
 			return received_count;
 		}
-		
+
 		QQ_t qq_;
 		string sessionKey_;
 		string api_url_prefix_ = "http://127.0.0.1:8080";

include/typedef.hpp

@@ -235,6 +235,7 @@ namespace Cyan
 	class MessageChain : public Serializable
 	{
 	public:
+		friend MessageChain& operator+(const string& str, MessageChain& mc);
 		MessageChain() :messages_(json::array()) {}
 		MessageChain(const MessageChain& mc)
 		{
@@ -260,6 +261,14 @@ namespace Cyan
 			messages_.insert(messages_.end(), mc.messages_.begin(), mc.messages_.end());
 			return *this;
 		}
+		MessageChain& operator+(const string& val)
+		{
+			return this->Plain(val);
+		}
+		MessageChain& operator+=(const string& val)
+		{
+			return this->Plain(val);
+		}
 		virtual ~MessageChain() = default;
 		MessageChain& At(const QQ_t qq)
 		{
@@ -291,6 +300,14 @@ namespace Cyan
 			messages_.push_back(j);
 			return *this;
 		}
+		template<typename T>
+		MessageChain& Plain(const T&& val)
+		{
+			std::stringstream ss;
+			ss << val;
+			this->Plain(ss.str());
+			return *this;
+		}
 		MessageChain& Image(const FriendImage& Image)
 		{
 			json j;
@@ -423,6 +440,14 @@ namespace Cyan
 		}
 	};
 
+
+	MessageChain& operator+(const string& str, MessageChain& mc)
+	{
+		MessageChain tmp;
+		tmp.Plain(str);
+		mc.messages_.insert(mc.messages_.begin(), tmp.messages_.begin(), tmp.messages_.end());
+		return mc;
+	}
 }
 
 #endif // !mirai_cpp__message_chain_hpp_H_