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  • It's a typo, I've corrected it. But the error is the same. typedef void (*cba)(uint8_t, uint8_t); Commented Oct 26, 2022 at 7:48
  • It's not typo, typo means something different. if you change typedef void (*cba)(uint8_t, uint8_t, uint8_t); to typedef void (*cba)(uint8_t, uint8_t); Code wil compile without errors Commented Oct 26, 2022 at 7:50
  • updownFns[0] = updownNone; It gave: /tmp/cc3MHoSt.ltrans0.ltrans.o: In function global constructors keyed to 65535_0_app.ino.cpp.o.4201': <artificial>:(.text.startup+0x144): undefined reference to Menu::updownFns' <artificial>:(.text.startup+0x148): undefined reference to `Menu::updownFns' collect2: error: ld returned 1 exit status exit status 1 Error compiling for board Arduino Pro or Pro Mini. Commented Oct 26, 2022 at 7:51
  • 1
    There are several issue with your code. You can use like this Remove initilization from ctor and init static variable outside. MenuFunction Menu::updownFns[] = {updownNone, updownAlarmHours, updownAlarmMinutes, updownTimeHours, updownTimeMinutes }; But when you want to use updownFns it will give errors because of the function is private within this context also. Commented Oct 26, 2022 at 8:03
  • I initialized the array outside of the class definition. No errors. I then used updownFns and no errors. Commented Oct 26, 2022 at 9:17