Always use struct

src/connection.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include "arena_allocator.hpp"
-#include "connection_handler.hpp"
 #include <cassert>
 #include <cstring>
 #include <deque>
@@ -10,6 +8,9 @@
 #include <sys/uio.h>
 #include <unistd.h>
 
+#include "arena_allocator.hpp"
+#include "connection_handler.hpp"
+
 #ifndef __has_feature
 #define __has_feature(x) 0
 #endif
@@ -39,7 +40,7 @@
  * private.
  */
 // Forward declaration
-class Server;
+struct Server;
 
 struct Connection {
   // No public constructor or factory method - only Server can create
@@ -305,7 +306,7 @@ struct Connection {
 
 private:
   // Server is a friend and can access all networking internals
-  friend class Server;
+  friend struct Server;
 
   /**
    * @brief Private constructor - only accessible by Server.