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<?php |
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declare(strict_types=1); |
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namespace Litipk\BigNumbers; |
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use Litipk\BigNumbers\Decimal as Decimal; |
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/** |
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* Class that holds many important numeric constants |
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* |
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* @author Andreu Correa Casablanca <[email protected]> |
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*/ |
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final class DecimalConstants |
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{ |
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/** @var Decimal */ |
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private static $ZERO = null; |
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/** @var Decimal */ |
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private static $ONE = null; |
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/** @var Decimal */ |
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private static $NEGATIVE_ONE = null; |
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/** @var Decimal */ |
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private static $PI = null; |
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/** @var Decimal */ |
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private static $EulerMascheroni = null; |
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/** @var Decimal */ |
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private static $GoldenRatio = null; |
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/** @var Decimal */ |
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private static $SilverRatio = null; |
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/** @var Decimal */ |
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private static $LightSpeed = null; |
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private function __construct() |
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{ |
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} |
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private function __clone() |
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{ |
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} |
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public static function zero(): Decimal |
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{ |
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if (null === self::$ZERO) { |
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1 |
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self::$ZERO = Decimal::fromInteger(0); |
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} |
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return self::$ZERO; |
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} |
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public static function one(): Decimal |
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{ |
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if (null === self::$ONE) { |
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self::$ONE = Decimal::fromInteger(1); |
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} |
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return self::$ONE; |
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} |
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public static function negativeOne(): Decimal |
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{ |
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if (null === self::$NEGATIVE_ONE) { |
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self::$NEGATIVE_ONE = Decimal::fromInteger(-1); |
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} |
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return self::$NEGATIVE_ONE; |
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} |
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/** |
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* Returns the Pi number. |
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* @return Decimal |
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*/ |
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public static function pi(): Decimal |
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{ |
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if (null === self::$PI) { |
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self::$PI = Decimal::fromString( |
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"3.14159265358979323846264338327950" |
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); |
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} |
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return self::$PI; |
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} |
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/** |
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* Returns the Euler's E number. |
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* @param integer $scale |
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* @return Decimal |
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*/ |
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public static function e(int $scale = 32): Decimal |
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{ |
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if ($scale < 0) { |
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throw new \InvalidArgumentException("\$scale must be positive."); |
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} |
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return static::one()->exp($scale); |
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} |
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/** |
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* Returns the Euler-Mascheroni constant. |
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* @return Decimal |
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*/ |
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public static function eulerMascheroni(): Decimal |
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{ |
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if (null === self::$EulerMascheroni) { |
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self::$EulerMascheroni = Decimal::fromString( |
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"0.57721566490153286060651209008240" |
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); |
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} |
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return self::$EulerMascheroni; |
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} |
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/** |
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* Returns the Golden Ration, also named Phi. |
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* @return Decimal |
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*/ |
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public static function goldenRatio(): Decimal |
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{ |
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if (null === self::$GoldenRatio) { |
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self::$GoldenRatio = Decimal::fromString( |
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"1.61803398874989484820458683436564" |
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); |
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} |
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return self::$GoldenRatio; |
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} |
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/** |
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* Returns the Silver Ratio. |
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* @return Decimal |
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*/ |
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public static function silverRatio(): Decimal |
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{ |
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if (null === self::$SilverRatio) { |
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self::$SilverRatio = Decimal::fromString( |
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"2.41421356237309504880168872420970" |
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); |
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} |
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return self::$SilverRatio; |
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} |
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/** |
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* Returns the Light of Speed measured in meters / second. |
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* @return Decimal |
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*/ |
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public static function lightSpeed(): Decimal |
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{ |
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if (null === self::$LightSpeed) { |
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self::$LightSpeed = Decimal::fromInteger(299792458); |
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} |
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return self::$LightSpeed; |
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} |
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} |
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Litipk /
php-bignumbers
