Attache the Arduino ISR function to the class member

[mkeyno]

I was intend to use timer interrupt for limited instances of a class in my ESP32 Arduino project, my first code conception was as follows

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1. typedef void (*irqCallback)  (void);
2.                 irqCallback timerCBArray[] ={  timerCB0 };
3.  
4. void ARDUINO_ISR_ATTR timerCB0(){
5.   portENTER_CRITICAL_ISR(&lock0);  
6.     //manipulate class private and public variables
7.   portEXIT_CRITICAL_ISR(&lock0);              
8.   }
9.  
10. hw_timer_t * timer[3] = NULL;
11.  
12. class myClass
13. {
14. private:
15.   irqCallback timmerCB;
16.   volatile uint8_t pri_var1,pri_var2;
17.   static uint8_t class_instance_number=0;
18. public:
19.   volatile uint8_t pub_var1,pub_var2;
20.   myClass(/* args */);
21.   ~myClass();
22. };

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however, I came to this problem, how can I change the variable inside the interrupt regards to each class instance
any help really appreciated