public function setAdult($adult = null)
{
// validation for constraint: enumeration
if (!\Api\EnumType\ApiAdultOption::valueIsValid($adult)) {
throw new \InvalidArgumentException(sprintf('Value "%s" is invalid, please use one of: %s', $adult, implode(', ', \Api\EnumType\ApiAdultOption::getValidValues())), __LINE__);
}
$this->Adult = $adult;
return $this;
}