Instance Methodattaswift.bigint 5.5.1BigInt
signum
Returns 1 if this value is, positive; otherwise, 0.
func signum() -> BigUInt Returns
The sign of this number, expressed as an integer of the same type.
Returns 1 if this value is, positive; otherwise, 0.
func signum() -> BigUInt The sign of this number, expressed as an integer of the same type.
import BigIntstruct BigUIntAn arbitary precision unsigned integer type, also known as a “big integer”.
init() Initializes a new BigUInt with value 0.
init(_ data: Data) Initializes an integer from the bits stored inside a piece of Data. The data is assumed to be in network (big-endian) byte order.
init(_ buffer: UnsafeRawBufferPointer) Initialize a BigInt from bytes accessed from an UnsafeRawBufferPointer
init<T>(_ source: T) where T : BinaryFloatingPoint init<T>(_ source: T) where T : BinaryInteger init?<S>(_ text: S, radix: Int = 10) where S : StringProtocol Initialize a big integer from an ASCII representation in a given radix. Numerals above 9 are represented by letters from the English alphabet.
init<T>(clamping source: T) where T : BinaryInteger init?(exactly source: Decimal) init?<T>(exactly source: T) where T : BinaryFloatingPoint init?<T>(exactly source: T) where T : BinaryInteger init(extendedGraphemeClusterLiteral value: String) Initialize a new big integer from an extended grapheme cluster. The cluster must consist of a decimal digit.
init(from decoder: Decoder) throws init(integerLiteral value: UInt64) Initialize a new big integer from an integer literal.
init(stringLiteral value: StringLiteralType) Initialize a new big integer from a decimal number represented by a string literal of arbitrary length. The string must contain only decimal digits.
init?(truncating source: Decimal) init<T>(truncatingIfNeeded source: T) where T : BinaryInteger init(unicodeScalarLiteral value: UnicodeScalar) Initialize a new big integer from a Unicode scalar. The scalar must represent a decimal digit.
init(words: [Word]) Initializes a new BigUInt with the specified digits. The digits are ordered from least to most significant.
init<Words>(words: Words) where Words : Sequence, Words.Element == UInt static let directMultiplicationLimit: IntMultiplication switches to an asymptotically better recursive algorithm when arguments have more words than this limit.
static var isSigned: Bool { get }static func compare(_ a: BigUInt, _ b: BigUInt) -> ComparisonResult Compare a to b and return an NSComparisonResult indicating their order.
static func randomInteger(lessThan limit: BigUInt) -> BigUInt Create a uniformly distributed random unsigned integer that’s less than the specified limit.
static func randomInteger<RNG>(lessThan limit: BigUInt, using generator: inout RNG) -> BigUInt where RNG : RandomNumberGenerator Create a uniformly distributed random unsigned integer that’s less than the specified limit.
static func randomInteger(withExactWidth width: Int) -> BigUInt Create a big unsigned integer consisting of width-1 uniformly distributed random bits followed by a one bit.
static func randomInteger<RNG>(withExactWidth width: Int, using generator: inout RNG) -> BigUInt where RNG : RandomNumberGenerator Create a big unsigned integer consisting of width-1 uniformly distributed random bits followed by a one bit.
static func randomInteger(withMaximumWidth width: Int) -> BigUInt Create a big unsigned integer consisting of width uniformly distributed random bits.
static func randomInteger<RNG>(withMaximumWidth width: Int, using generator: inout RNG) -> BigUInt where RNG : RandomNumberGenerator Create a big unsigned integer consisting of width uniformly distributed random bits.
var bitWidth: Int { get }The minimum number of bits required to represent this integer in binary.
var debugDescription: String { get }Return the decimal representation of this integer.
var description: String { get }Return the decimal representation of this integer.
var isZero: Bool { get }Return true iff this integer is zero.
var leadingZeroBitCount: Int { get }The number of leading zero bits in the binary representation of this integer in base 2^(Word.bitWidth). This is useful when you need to normalize a BigUInt such that the top bit of its most significant word is 1.
var playgroundDescription: Any { get }Return the playground quick look representation of this integer.
var trailingZeroBitCount: Int { get }The number of trailing zero bits in the binary representation of this integer.
var words: Words { get }subscript(bitAt index: Int) -> Bool { get set } static func % (x: BigUInt, y: BigUInt) -> BigUInt Divide x by y and return the remainder.
static func %= (x: inout BigUInt, y: BigUInt) Divide x by y and store the remainder in x.
static func &= (a: inout BigUInt, b: BigUInt) Calculate the bitwise AND of a and b and return the result.
static func * (x: BigUInt, y: BigUInt) -> BigUInt Multiply a by b and return the result.
static func *= (a: inout BigUInt, b: BigUInt) Multiply a by b and store the result in a.
static func + (a: BigUInt, b: BigUInt) -> BigUInt Add a and b together and return the result.
static func += (a: inout BigUInt, b: BigUInt) Add a and b together, and store the sum in a.
static func - (a: BigUInt, b: BigUInt) -> BigUInt Subtract b from a and return the result.
static func -= (a: inout BigUInt, b: BigUInt) Subtract b from a and store the result in a.
static func / (x: BigUInt, y: BigUInt) -> BigUInt Divide x by y and return the quotient.
static func /= (x: inout BigUInt, y: BigUInt) Divide x by y and store the quotient in x.
static func < (a: BigUInt, b: BigUInt) -> Bool Return true iff a is less than b.
static func << <Other>(lhs: BigUInt, rhs: Other) -> BigUInt where Other : BinaryInteger static func <<= <Other>(lhs: inout BigUInt, rhs: Other) where Other : BinaryInteger static func == (a: BigUInt, b: BigUInt) -> Bool Return true iff a is equal to b.
static func >> <Other>(lhs: BigUInt, rhs: Other) -> BigUInt where Other : BinaryInteger static func >>= <Other>(lhs: inout BigUInt, rhs: Other) where Other : BinaryInteger static func ^= (a: inout BigUInt, b: BigUInt) Calculate the bitwise XOR of a and b and return the result.
static func |= (a: inout BigUInt, b: BigUInt) Calculate the bitwise OR of a and b, and store the result in a.
static func ~ (a: BigUInt) -> BigUInt Return the ones’ complement of a.
func advanced(by n: BigInt) -> BigUInt Adds n to self and returns the result. Traps if the result would be less than zero.
mutating func decrement(shiftedBy shift: Int = 0) Decrement this integer by one.
func distance(to other: BigUInt) -> BigInt Returns the (potentially negative) difference between self and other as a BigInt. Never traps.
func encode(to encoder: Encoder) throws func greatestCommonDivisor(with b: BigUInt) -> BigUInt Returns the greatest common divisor of self and b.
func hash(into hasher: inout Hasher) Append this BigUInt to the specified hasher.
func inverse(_ modulus: BigUInt) -> BigUInt? Returns the multiplicative inverse of this integer in modulo modulus arithmetic, or nil if there is no such number.
func isPrime(rounds: Int = 10) -> Bool Returns true if this integer is probably prime. Returns false if this integer is definitely not prime.
func isStrongProbablePrime(_ base: BigUInt) -> Bool Returns true iff this integer passes the strong probable prime test for the specified base.
func multiplied(by y: BigUInt) -> BigUInt Multiply this integer by y and return the result.
func multiplied(byWord y: Word) -> BigUInt Multiply this big integer by a single Word, and return the result.
mutating func multiply(byWord y: Word) Multiply this big integer by a single word, and store the result in place of the original big integer.
mutating func multiplyAndAdd(_ x: BigUInt, _ y: Word, shiftedBy shift: Int = 0) Multiply x by y, and add the result to this integer, optionally shifted shift words to the left.
func power(_ exponent: Int) -> BigUInt Returns this integer raised to the power exponent.
func power(_ exponent: BigUInt, modulus: BigUInt) -> BigUInt Returns the remainder of this integer raised to the power exponent in modulo arithmetic under modulus.
func quotientAndRemainder(dividingBy y: BigUInt) -> (quotient: BigUInt, remainder: BigUInt) Divide this integer by y and return the resulting quotient and remainder.
func serialize() -> Data Return a Data value that contains the base-256 representation of this integer, in network (big-endian) byte order.
func serializeToBuffer() -> UnsafeRawBufferPointer Return a UnsafeRawBufferPointer buffer that contains the base-256 representation of this integer, in network (big-endian) byte order.
func squareRoot() -> BigUInt Returns the integer square root of a big integer; i.e., the largest integer whose square isn’t greater than value.
mutating func subtract(_ other: BigUInt, shiftedBy shift: Int = 0) Subtract other from this integer in place. other is shifted shift digits to the left before being subtracted.
mutating func subtractReportingOverflow(_ b: BigUInt, shiftedBy shift: Int = 0) -> Bool Subtract other from this integer in place, and return a flag indicating if the operation caused an arithmetic overflow. other is shifted shift digits to the left before being subtracted.
func subtracting(_ other: BigUInt, shiftedBy shift: Int = 0) -> BigUInt Subtract b from this integer, and return the difference. b is shifted shift digits to the left before being subtracted.
func subtractingReportingOverflow(_ other: BigUInt) -> (partialValue: BigUInt, overflow: Bool) Subtracts other from self, returning the result and a flag indicating arithmetic overflow.
func subtractingReportingOverflow(_ other: BigUInt, shiftedBy shift: Int) -> (partialValue: BigUInt, overflow: Bool) Subtract other from this integer, returning the difference and a flag indicating arithmetic overflow. other is shifted shift digits to the left before being subtracted.
struct Wordstypealias Stride = BigIntA type that can represent the distance between two values ofa BigUInt.
typealias Word = UIntThe type representing a digit in BigUInt’s underlying number system.