Override inherited array size

Projects Programming
1

Hi there!

Is it possible to override a generic array that is declared in a parent class and call a method on the child (which is declared in a generic manner in the parent) which actually uses the array from the child itself? I know that in C++ I should allways use predefined array sizes and buffers in code. So actually the size is predefined but in a child class. Hope I explained it well enough.

Parent .h:

class SCTFTScreen
{
  public:
    Adafruit_ILI9341 & tft;
    SCTFTScreen(Adafruit_ILI9341 & tftInstance, int index);
    int numSubviews = 0;
    SCTFTView * subviews[];
    void printNames();
};

Parent .cpp:

void SCTFTScreen::printNames()
{
   for(int i=0;i<numSubviews;i++)
   { 
      SCTFTView * v = subviews[i];
      v->printName();
    }
}

Child .h:

class I2CScreenScan : public SCTFTScreen
{
  public:
    I2CScreenScan(Adafruit_ILI9341 & tftInstance, int index);
    SCTFTView * subviews[2];
}

Child .cpp:

I2CScreenScan::I2CScreenScan(Adafruit_ILI9341 & tftInstance, int index) : SCTFTScreen(tftInstance, index)
{
  index = index;
  btnScan = new SCTFTTouchButton("SCAN",tftInstance,0,290,60,30);
  btnSettings = new SCTFTTouchButton("CONSOLE",tftInstance,180,290,60,30);
  numSubviews = 2;
  subviews[0] = (SCTFTView*) btnScan;
  subviews[1] = (SCTFTView*) btnSettings;
}

Somewhere else in code:

I2CScreenScan * screen(tft,0);
screen->printNames();

Should result in:

SCAN
CONSOLES

I tried to do that and the compiler didnt complain. It runs the code for i=0 fine. Any higher numbers crashes the ESP. So I suspect this is a memory address problem?!

Thank you very much!

2

It would be a lot easier to look at if you put all of this in a single file with .h file contents followed by .cpp file contents followed by setup() followed by loop(). That way we could drop the whole thing into the IDE a play with it. You could always then break it into separate .h / .cpp files later.