Conditional based on variable type?

Projects Programming
20

After a coffee and a little movement... I've decided that functions related to setting a cursor position have no place interfering with printing or clearing the screen. And so I've changed the usage to be something I feel is much better suited (and less hassle, to be fair):

"CenterAlign.h" (That should and will be split into .h and .cpp)

#ifndef CENTER_ALIGN_H
#define CENTER_ALIGN_H

/*
Ironed out with some aide from 'gfvalvo' and 'J-M-L':
https://forum.arduino.cc/t/conditional-based-on-variable-type/925410/
*/

#ifndef LCD_COLS
#define LCD_COLS 16
#endif

size_t getCharLength(const char* cp) {
  return strlen(cp);
}

size_t getCharLength(String &s) {
  return s.length();
}

size_t getCharLength(const __FlashStringHelper *ifsh) {
  return strlen_P(reinterpret_cast<PGM_P>(ifsh));
}

size_t getCharLength(const int& i) {
  char buffer[17];
  return sprintf(buffer, "%d", i);
}

size_t getCharLength(const double& d, uint8_t dec = 2) {
  char buffer[17] = {'\n'};
  return strlen(dtostrf(d, 0, dec, buffer));
}

template<typename T>
size_t centerMinus(T t) {
  return (LCD_COLS / 2) - (getCharLength(t) / 2.f);
}

template<typename T>
size_t centerMinus(T t, uint8_t dec) {
  return (LCD_COLS / 2) - (getCharLength(t, dec) / 2.f);
}

#endif

And an example: (Note! #define LCD_COLS has to come before the include "CenterAlign.h" or it will default to 16 cols)

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define LCD_COLS 16
#include "CenterAlign.h"

void setup() {
  Serial.begin(115600);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  
  /* 
  Usage: centerMinus(Variable); 
  For floats/doubles...  centerMinus(Variable, decimalPlaces);
  decimalPlaces defaults to 2.
  */


// Uncomment for test cases
  String x = "Centered";
  lcd.setCursor(centerMinus(x), 0);
  lcd.print(x);

  // char* x = "Centered";
  // lcd.setCursor(centerMinus(x), 0);
  // lcd.print(x);

  // char x[] = "Centered";
  // lcd.setCursor(centerMinus(x), 0);
  // lcd.print(x);

  // lcd.setCursor(centerMinus(F("Centered")), 0);
  // lcd.print(F("Centered"));

  // lcd.setCursor(centerMinus("Centered"), 0);
  // lcd.print("Centered");

  // int y = 22222;
  // lcd.setCursor(centerMinus(y), 1);
  // lcd.print(y);

  // int y = -22222;
  // lcd.setCursor(centerMinus(y), 1);
  // lcd.print(y);


// Float and double defaults to 2 decimal places unless specified like so
  float y = 49.8765432;
  lcd.setCursor(centerMinus(y, 7), 1);
  lcd.print(y, 7);

  // double y = 49.8765432;
  // lcd.setCursor(centerMinus(y), 0);
  // lcd.print(y);

}
void loop() { }