init(exactly:)

Creates a new instance initialized to the given value, if it can be represented without rounding.

init?(exactly other: Double)

Mangled symbol

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FNV24: [2L6P1]

Parameters

other: The value to use for the new instance.

If other can’t be represented as an instance of Double without rounding, the result of this initializer is nil. In particular, passing NaN as other always results in nil.

let x: Double = 21.25
let y = Double(exactly: x)
// y == Optional.some(21.25)

let z = Double(exactly: Double.nan)
// z == nil

Other members in extension

Types

struct SIMD16Storage
Storage for a vector of 16 floating-point values.
struct SIMD2Storage
Storage for a vector of two floating-point values.
struct SIMD32Storage
Storage for a vector of 32 floating-point values.
struct SIMD4Storage
Storage for a vector of four floating-point values.
struct SIMD64Storage
Storage for a vector of 64 floating-point values.
struct SIMD8Storage
Storage for a vector of eight floating-point values.

Typealiases

Type members

init()
init(Double)
Creates a new instance initialized to the given value.
init(Float)
Creates a new instance that approximates the given value.
init?(Substring)
init?<S>(S)
Creates a new instance from the given string.
init(Int)
init(Float16)
Creates a new instance that approximates the given value.
init<Source>(Source)
init(bitPattern: UInt64)
Creates a new value with the given bit pattern.
init?(exactly: Float)
Creates a new instance initialized to the given value, if it can be represented without rounding.
init?(exactly: Float16)
Creates a new instance initialized to the given value, if it can be represented without rounding.
init?<Source>(exactly: Source)
init(floatLiteral: Double)
init(from: any Decoder) throws
init(integerLiteral: Int64)
init(nan: Double.RawSignificand, signaling: Bool)
Creates a NaN (“not a number”) value with the specified payload.
init(sign: FloatingPointSign, exponent: Int, significand: Double)
init(sign: FloatingPointSign, exponentBitPattern: UInt, significandBitPattern: UInt64)
init(signOf: Double, magnitudeOf: Double)
static var exponentBitCount: Int
static var greatestFiniteMagnitude: Double
static var infinity: Double
static var leastNonzeroMagnitude: Double
static var leastNormalMagnitude: Double
static var nan: Double
static var pi: Double
static var signalingNaN: Double
static var significandBitCount: Int
static var ulpOfOne: Double
The unit in the last place of 1.0.
static func * (lhs: Double, rhs: Double) -> Double
static func *= (lhs: inout Double, rhs: Double)
static func + (lhs: Double, rhs: Double) -> Double
static func += (lhs: inout Double, rhs: Double)
static func - (x: Double) -> Double
static func - (lhs: Double, rhs: Double) -> Double
static func -= (lhs: inout Double, rhs: Double)
static func / (lhs: Double, rhs: Double) -> Double
static func /= (lhs: inout Double, rhs: Double)

Instance members

var binade: Double
var bitPattern: UInt64
The bit pattern of the value’s encoding.
var customMirror: Mirror
A mirror that reflects the Double instance.
var debugDescription: String
A textual representation of the value, suitable for debugging.
var description: String
A textual representation of the value.
var exponent: Int
var exponentBitPattern: UInt
var isCanonical: Bool
var isFinite: Bool
var isInfinite: Bool
var isNaN: Bool
var isNormal: Bool
var isSignalingNaN: Bool
var isSubnormal: Bool
var isZero: Bool
var magnitude: Double
var nextUp: Double
var sign: FloatingPointSign
var significand: Double
var significandBitPattern: UInt64
var significandWidth: Int
var ulp: Double
func addProduct(Double, Double)
func advanced(by: Double) -> Double
func distance(to: Double) -> Double
func encode(to: any Encoder) throws
Encodes this value into the given encoder.
func formRemainder(dividingBy: Double)
func formSquareRoot()
func formTruncatingRemainder(dividingBy: Double)
func hash(into: inout Hasher)
func isEqual(to: Double) -> Bool
func isLess(than: Double) -> Bool
func isLessThanOrEqualTo(Double) -> Bool
func negate()
func round(FloatingPointRoundingRule)
func write<Target>(to: inout Target)

Show obsolete interfaces (1)

var customPlaygroundQuickLook: _PlaygroundQuickLook
A custom playground Quick Look for the Double instance.