이대로 제출해버릴까..

include/socket/socket.h

@@ -7,7 +7,7 @@ struct Address;
 
 class Socket {
  public:
-  Socket() = default;
+  Socket();
   Socket(int domain, int type, int protocol);
   ~Socket();
 

include/socket/tcp_socket.h

@@ -7,6 +7,8 @@ class TCPSocket : public Socket {
  public:
   using Socket::init;
   using Socket::Socket;
+  TCPSocket(int domain);
+
   int init(int domain);
   int listen(int __n);
   void accept(std::shared_ptr<TCPSocket>& newSock, Address& addr);