C Pointer in Konstruktor übergeben und in Variable speichern

#include "mthread.h"

int d2 = 2; //Gas
int d3 = 3; //Querruder
int d4 = 4; //Höhenruder
int d5 = 5; //Seitenruder

JoyState_t joySt;
 
class MainThread : public Thread {
    public:
          MainThread(*Joystate_t);
    protected:
        bool loop();
        Joystate_t *joyst;
};
 
//Definition des Konstruktors
MainThread::MainThread(Joystate_t *j){
  this->joyst = j;
}

//Definition der Threadschleife
bool MainThread::loop() {
    //Die if requested:
    if(kill_flag)
        return false;
    // code ----
    
    Joystick.setState(joyst);
    this->sleep_milli(10); 
    
    // ---- code
    return true;
}

void setup() {
	pinMode(d2, INPUT);
	pinMode(d3, INPUT);
	pinMode(d4, INPUT);
	pinMode(d5, INPUT);
	//pinMode(13, OUTPUT);
	Serial.begin(115200);

	joySt.xAxis = 0;
	joySt.yAxis = 0;
	joySt.zAxis = 0;
	joySt.xRotAxis = 0;
	joySt.yRotAxis = 0;
	joySt.zRotAxis = 0;
	joySt.throttle = 0;
	joySt.rudder = 0;
	joySt.hatSw1 = 0;
	joySt.hatSw2 = 0;
	joySt.buttons = 0;

        main_thread_list->add_thread(new MainThread(&joySt));

}

bool laststate[4] = { LOW, LOW, LOW, LOW };
unsigned long startzeit[4];

void loop() {

	if (digitalRead(d2) == HIGH && laststate[0] == LOW) {
		startzeit[0] = micros();
		laststate[0] = HIGH;
	} else if (digitalRead(d2) == LOW && laststate[0] == HIGH) {
		int x = (micros() - startzeit[0] - 1012) / 3.8274;
		// if (x < 0) x = 0;
                // if (x > 255) x = 255;
		joySt.throttle = x;
		laststate[0] = LOW;
	}

        // usw.... 

}

 JoyState_t *joySt;