/**
* Subtracts the passed monetary value from the current one
*
* @throws fValidationException When `$subtrahend` is not a valid number/monetary value
*
* @param fMoney|string|integer $subtrahend The money object to subtract - a string or integer will be converted to the default currency (if defined)
* @return fMoney The difference of the monetary values in this currency
*/
public function sub($subtrahend)
{
$subtrahend = $this->makeMoney($subtrahend);
$converted_subtrahend = $subtrahend->convert($this->currency)->amount;
$precision = self::getCurrencyInfo($this->currency, 'precision');
$new_amount = $this->amount->sub($converted_subtrahend, $precision + 1)->round($precision);
return new fMoney($new_amount, $this->currency);
}
/**
* @dataProvider invalidNumProvider
* @expectedException fValidationException
*/
public function testSubFail($number)
{
$num = new fNumber('1');
$num->sub($number);
}
