Object assignment - invalid use of member function error - c++

Question

I have a class which includes among its members an object of another class.
The header file looks like this:
class LinxArduinoEthernetListener : public LinxListener
{
EthernetServer ArduinoTcpServer(uint16_t);
Where EthernetServer is itself a class (defined in the Arduino EthernetServer.h library).
Because I do not know the port at compile time, but the server object should be a member of the listener class, I allow the server object to be initialized in the class constructor, and then attempt to reassign that object later, using the following code (in the corresponding .cpp file):
ArduinoTcpServer = EthernetServer(port);
Where "port" is a uint16_t. As far as I know, this is the correct way to reassign to an object variable a newly constructed instance.
And yet, the compiler gives me the following error:
LinxArduinoEthernetListener.cpp:122: error: invalid use of member
function (did you forget the '()' ?)
ArduinoTcpServer = EthernetServer((uint16_t)port);
I think this may be related to the error I get for the immediately subsequent function call:
LinxArduinoEthernetListener.cpp:123: error:
'((LinxArduinoEthernetListener*)this)->LinxArduinoEthernetListener::ArduinoTcpServer'
does not have class type
ArduinoTcpServer.begin();
But I would say it clearly does have a class type, namely the EthernetServer class, as specified in the header file.
What am I doing wrong here?

Answer 1

EthernetServer ArduinoTcpServer(uint16_t); declares a member function named ArduinoTcpServer. To declare a member variable, omit the parameter type and parentheses. Also add a constructor to initialize the member variable, e.g. :
class LinxArduinoEthernetListener : public LinxListener
{
public:
EthernetServer ArduinoTcpServer;
LinxArduinoEthernetListener(uint16_t port)
: ArduinoTcpServer(port)
{
}
};

Answer 2

So, the issue was the declaration of the server object.
Initially, I had it declared as follows:
EthernetServer ArduinoTcpServer(22);
But I would get an error about "expected identifier before numeric constant" referring to the 22. So I googled it, and found someone suggesting that (in some context I don't remember) specifying only the type was sufficient to call the constructor matching that prototype. Doing so allowed the compiler to continue, so I assumed that was valid. However, it seems not.
The real issue is that the compiler Arduino IDE uses requires braces initialization, e.g.
EthernetServer ArduinoTcpServer{22};
That seems to work.