Replace all include guards by #pragma once

It’s $CURRENT_YEAR

src/irc/iid.hpp

@@ -1,5 +1,5 @@
-#ifndef IID_INCLUDED
-# define IID_INCLUDED
+#pragma once
+
 
 #include <string>
 
@@ -76,4 +76,4 @@ namespace std {
   const std::string to_string(const Iid& iid);
 }
 
-#endif // IID_INCLUDED
+

src/irc/irc_channel.hpp

@@ -1,5 +1,5 @@
-#ifndef IRC_CHANNEL_INCLUDED
-# define IRC_CHANNEL_INCLUDED
+#pragma once
+
 
 #include <irc/irc_user.hpp>
 #include <memory>
@@ -67,4 +67,4 @@ public:
   bool joining;
 };
 
-#endif // IRC_CHANNEL_INCLUDED
+

src/irc/irc_client.hpp

@@ -1,5 +1,5 @@
-#ifndef IRC_CLIENT_INCLUDED
-# define IRC_CLIENT_INCLUDED
+#pragma once
+
 
 #include <irc/irc_message.hpp>
 #include <irc/irc_channel.hpp>
@@ -380,4 +380,4 @@ private:
   Resolver dns_resolver;
 };
 
-#endif // IRC_CLIENT_INCLUDED
+

src/irc/irc_message.hpp

@@ -1,5 +1,5 @@
-#ifndef IRC_MESSAGE_INCLUDED
-# define IRC_MESSAGE_INCLUDED
+#pragma once
+
 
 #include <vector>
 #include <string>
@@ -25,4 +25,4 @@ public:
 
 std::ostream& operator<<(std::ostream& os, const IrcMessage& message);
 
-#endif // IRC_MESSAGE_INCLUDED
+

src/irc/irc_user.hpp

@@ -1,5 +1,5 @@
-#ifndef IRC_USER_INCLUDED
-# define IRC_USER_INCLUDED
+#pragma once
+
 
 #include <vector>
 #include <string>
@@ -30,4 +30,4 @@ public:
   std::set<char> modes;
 };
 
-#endif // IRC_USER_INCLUDED
+