/**
* @param Decimal $dividend The ratio's dividend.
* @param Decimal $divisor The ratio's divisor.
*/
public function __construct(Decimal $dividend, Decimal $divisor)
{
if ($divisor->isZero()) {
throw new \InvalidArgumentException('Cannot create Ratio with zero consequent.');
}
$this->dividend = $dividend;
$this->divisor = $divisor;
}
/**
* Divides this decimal by another.
*
* @param Decimal $other
* @param int $scale
*
* @return Decimal
*/
public function divideBy(Decimal $other, int $scale = null) : Decimal
{
if ($other->isZero()) {
throw new \LogicException('Cannot divide by zero.');
}
if ($other->isOne()) {
return $this;
}
if (null === $scale) {
// Determine a reasonable scale to avoid too much loss of precision.
$abs = $this->abs();
$otherAbs = $other->abs();
$otherLog10 = self::computeLog10($otherAbs->value, $otherAbs->numberOfDecimalPlaces(), 1);
$log10 = self::computeLog10($abs->value, $abs->numberOfDecimalPlaces(), 1) - $otherLog10;
$totalDecimalPlaces = $this->numberOfDecimalPlaces() + $other->numberOfDecimalPlaces();
$maxSignificantDigits = max($this->numberOfSignificantDigits(), $other->numberOfSignificantDigits());
$scale = (int) max($totalDecimalPlaces, $maxSignificantDigits - max(ceil($log10), 0), ceil(-$log10) + 1);
}
$result = bcdiv($this->value, $other->value, $scale);
return static::fromString($result);
}
