/* 
    Reference to a LCD object
    2024-09-30 by noiasca
    https://forum.arduino.cc/t/own-library-problem/1306536/3
    code in thread
*/


#include <LiquidCrystal_I2C.h>     // if you don´t have I2C version of the display, use LiquidCrystal.h library instead

LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display

template <class T>
class Helper {
  T &local; // you could call it lcd also 

public:
  Helper (T &local) : local(local) {}

  void foo(char value) {
    local.print(value);
  }
};

Helper<LiquidCrystal_I2C> helper(lcd);

void setup() {
  lcd.init();                       // initialize the 16x2 lcd module
  lcd.backlight();                  // enable backlight for the LCD module
  lcd.print(F("direct "));

  helper.foo('a');
  helper.foo('b');
}

void loop() {

}