invalid use of member function (did you forget the '()' ) - c++

Question

I'm trying to wrap arduino's RF24 functions into a simpler class that I could use more intuitively in the future, so I have made a .h file:
#ifndef RADIO_H
#define RADIO_H
#include <RF24.h>
#include <Arduino.h>
class Radio
{
private:
RF24 radio(int ce, int csn);
int opMode;
byte address;
protected:
void setReceiver();
void setTransmitter();
public:
Radio(int ce, int csn, int mode, byte channel);
};
#endif
and a .cpp file:
#include "Radio.h"
#include "Parameters.h"
#include <Arduino.h>
#include <SPI.h>
#include <RF24.h>
#include <nRF24L01.h>
Radio::Radio(int ce, int csn, int mode, byte channel){
RF24 radio(ce,csn);
radio.begin();
opMode = mode;
address = channel;
if(opMode == RX){
setReceiver();
}
else if(opMode == TX){
setTransmitter();
}
}
//Protected Functions
void Radio::setReceiver(){
//radio.openReadingPipe(0,address);
//radio.startListening();
}
void Radio::setTransmitter(){
//radio.openWritingPipe(address);
radio.stopListening();
}
However, I'm receiving the following error and can't figure out what's wrong with the code:
sketch\Radio.cpp: In member function 'void Radio::setTransmitter()':
Radio.cpp:74:2: error: invalid use of member function 'RF24
Radio::radio(int, int)' (did you forget the '()' ?)
radio.stopListening(); ^~~~~ Radio.cpp:74:2: error: invalid use of
member function 'RF24 Radio::radio(int, int)' (did you forget the '()'
?) exit status 1 invalid use of member function 'RF24
Radio::radio(int, int)' (did you forget the '()' ?)
can anyone help me figure out what went wrong?

Answer 1

You want an instance of RF24 called radio but you've declared a function called radio that returns an RF24 instance:
class Radio
{
private:
RF24 radio; // remove: (int ce, int csn);
...
Then in your constructor, initialize it like this:
Radio::Radio(int ce, int csn, int mode, byte channel)
: // colon starts the member initializer list
radio(ce, csn) // initialize the radio
{
...

Answer 2

You've declared a member function radio that takes two ints and returns a RF24.
Declare radio as a member variable in the same way as other member variables,
RF24 radio;
and initialize it in the initializer list,
Radio::Radio(int ce, int csn, int mode, byte channel)
: radio(ce, csn)
{
radio.begin();
// ...