Conditional based on variable type?

Projects Programming
14

Great!

Well, in that case, I think this might be mission accomplished? The center-aligned LCD print.

Can I please throw this to the wolves to see if it survives?

I've added comments where needed to explain, and you'll need to simply uncomment the test cases (mostly a variable and print statement).

I'll probably pull this into a .h file if/when I want to use it.

A small gripe is the truncation favouring extra space on the left, I'd rather it be on the right.


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

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 float& f, uint8_t dec = 2) {
  char buffer[17] = {'\n'};
  return strlen(dtostrf(f, 0, dec, buffer));
}

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

template<typename T>
void LCDPrint(T t, uint8_t row, bool clear = false) {
  if (clear) lcd.clear();
  lcd.setCursor(8 - (getCharLength(t) / 2), row);
  lcd.print(t);
}

template<typename T>
void LCDPrint(T &t, uint8_t p, uint8_t row, bool clear = false) {
  if (clear) lcd.clear();
  lcd.setCursor(8 - (getCharLength(t, p) / 2), row);
  lcd.print(t, p);
}

void setup() {
  Serial.begin(115600);
  lcd.init();
  lcd.backlight();
  lcd.clear();

  // Usage:
  // LCDPrint(Variable, LCD Row, Bool To Clear LCD);
  // Or...
  // LCDPrint(Variable, Decimal Places, LCD Row, Bool To Clear LCD);
  // Bool to clear LCD is defaulted to false;

  // String x = "TEN CHARS!";
  // LCDPrint(x, 0);

  // char* x = "TEN CHARS!";
  // LCDPrint(x, 0);

  // char x[] = "TEN CHARS!";
  // LCDPrint(x, 0);

  // LCDPrint(F("TEN CHARS!"), 0, true);

  // LCDPrint("TEN CHARS!", 0);

  // int x = 22222;
  // LCDPrint(x, 0);

  // int x = -22222;
  // LCDPrint(x, 0);



  // Float and double defaults to 2 decimal places unless specified.
  // float x = 49.8765432;
  // LCDPrint(x, 0);

  // Unfortunately the overload is ambiguous, so if we specify the decimals
  // we HAVE to specify true/false to clear the LCD.
  // float x = 49.8765432;
  // LCDPrint(x, 3, 0, false);

  // double x = 49.8765432;
  // LCDPrint(x, 0);
}

void loop() { }