Package org.pkl.core.util

Class MathUtils

java.lang.Object

org.pkl.core.util.MathUtils

public final class MathUtils
extends Object

Method Summary

Modifier and Type	Method	Description
static long	checkedMultiply(long a, long b)	Returns the product of a and b, provided it does not overflow.
static long	checkedPow(long b, int k)	Returns the b to the kth power, provided it does not overflow.
static long	gcd(long a, long b)	Returns the greatest common divisor of a, b.
static boolean	isMathematicalInteger(double x)
static boolean	isPowerOfTwo(double x)	Returns true if x is exactly equal to 2^k for some finite integer k.
static boolean	isPowerOfTwo(long x)	Returns true if x represents a power of two.
static long	roundToLong(double x, RoundingMode mode)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

roundToLong

public static long roundToLong(double x,
 RoundingMode mode)

isMathematicalInteger

public static boolean isMathematicalInteger(double x)

isPowerOfTwo

public static boolean isPowerOfTwo(long x)

Returns true if x represents a power of two.

This differs from Long.bitCount(x) == 1, because Long.bitCount(Long.MIN_VALUE) == 1, but Long.MIN_VALUE is not a power of two.

isPowerOfTwo

public static boolean isPowerOfTwo(double x)

Returns true if x is exactly equal to 2^k for some finite integer k.

checkedPow

public static long checkedPow(long b,
 int k)

Returns the b to the kth power, provided it does not overflow.

Throws:

ArithmeticException - if b to the kth power overflows in signed long arithmetic

gcd

public static long gcd(long a,
 long b)

Returns the greatest common divisor of a, b. Returns 0 if a == 0 && b == 0.

Throws:

IllegalArgumentException - if a < 0 or b < 0

checkedMultiply

public static long checkedMultiply(long a,
 long b)

Returns the product of a and b, provided it does not overflow.

Throws:

ArithmeticException - if a * b overflows in signed long arithmetic