Add the missing & for 3 std::string function arguments

src/bridge/bridge.cpp

@@ -563,7 +563,7 @@ void Bridge::on_gateway_ping(const std::string& irc_hostname, const std::string&
                                   "", true);
 }
 
-void Bridge::send_irc_invitation(const Iid& iid, const std::string to)
+void Bridge::send_irc_invitation(const Iid& iid, const std::string& to)
 {
   IrcClient* irc = this->get_irc_client(iid.get_server());
   Jid to_jid(to);

src/bridge/bridge.hpp

@@ -111,7 +111,7 @@ public:
   void on_gateway_ping(const std::string& irc_hostname, const std::string& iq_id, const std::string& to_jid,
                        const std::string& from_jid);
 
-  void send_irc_invitation(const Iid& iid, const std::string to);
+  void send_irc_invitation(const Iid& iid, const std::string& to);
 
   /***
    **

src/irc/iid.cpp

@@ -5,7 +5,7 @@
 
 #include <utils/encoding.hpp>
 
-Iid::Iid(const std::string local, const std::string server, Iid::Type type):
+Iid::Iid(const std::string& local, const std::string& server, Iid::Type type):
         type(type),
         local(local),
         server(server)

src/irc/iid.hpp

@@ -58,7 +58,7 @@ public:
   Iid(const std::string& iid, const std::set<char>& chantypes);
   Iid(const std::string& iid, const std::initializer_list<char>& chantypes);
   Iid(const std::string& iid, const Bridge* bridge);
-  Iid(const std::string local, const std::string server, Type type);
+  Iid(const std::string& local, const std::string& server, Type type);
   Iid() = default;
   Iid(const Iid&) = default;