/**
* Checks if the value represented by this object is positive
*
* @return bool
*/
public function isPositive()
{
return $this->amount->isPositive();
}
/**
* Indicates if the passed parameter has the same sign as the method's bound object.
*
* @param Decimal $b
* @return bool
*/
public function hasSameSign(Decimal $b)
{
return $this->isPositive() && $b->isPositive() || $this->isNegative() && $b->isNegative();
}
/**
* Powers this value to $b
*
* @param Decimal $b exponent
* @param integer $scale
* @return Decimal
*/
public function pow(Decimal $b, $scale = null)
{
if ($b->isPositive()) {
if ($this->isPositive()) {
return $this;
}
// if ($this->isNegative())
if ($b->isInfinite()) {
throw new \DomainException("Negative infinite elevated to infinite is undefined.");
}
if ($b->isInteger()) {
if (preg_match('/^[+\\-]?[0-9]*[02468](\\.0+)?$/', $b->value, $captures) === 1) {
// $b is an even number
return self::$pInf;
} else {
// $b is an odd number
return $this;
// Negative Infinite
}
}
throw new NotImplementedException("See issues #21, #22, #23 and #24 on Github.");
} else {
if ($b->isNegative()) {
return DecimalConstants::Zero();
} else {
if ($b->isZero()) {
throw new \DomainException("Infinite elevated to zero is undefined.");
}
}
}
}
