function distance_get($value, $unit = 'meters', $from = 'meters')
 {
     if (!$value instanceof Distance) {
         $value = new Distance($value, $from);
     }
     return $value->asUnit($unit);
 }
 protected function loadConfig(Distance $distance)
 {
     $config = (include __DIR__ . '/../src/config/config.php');
     return $distance->setConfig($config);
 }
 public function increment(Distance $distance)
 {
     $value = new static($this->asBase() + $distance->asBase(), 'meters', $this->config);
     $this->value = $value->asUnit($this->unit);
     return $this;
 }