isAlphaNumeric function

bool isAlphaNumeric(
  1. int c
)

Implementation

bool isAlphaNumeric(int c) {
  if (c < _codeUnit_0 ||
      c > _codeUnit_z ||
      ((c > _codeUnit_9 && c < _codeUnit_A) ||
          (c > _codeUnit_Z && c < _codeUnit_a && c != _codeUnit__))) {
    return false;
  }
  return true;
}