🅿️FloatingPoint

完整支援「加減乘除」的協定。

🌀 擴充

• .decimalPlaces() - 限制小數顯示位數。

• floating +−⨉÷ int - 與 Int 做四則運算。

🔸 定義

// 🅿️ FloatingPoint
protocol FloatingPoint {

    // instance properties
    var sign: FloatingPointSign { get }
    var exponent: Self.Exponent { get }
    var significand: Self { get }
    
    // type properties
    static var radix: Int { get }
}

floating-point representation (32-bit)

📗 參考

Exploring Swift’s numeric protocols - iOS Conf SG 2017YouTube

• Jesse ⟩

  • Floating-point Swift, ulp, and epsilon

  • Exploring Swift’s numeric types and protocols ⭐️ (slides)

  • When should you use Decimal instead of Double?

📘 手冊

• Swift ⟩ Numbers and Basic Values ⟩ Numeric Protocols ⟩ FloatingPoint

  • .squareRoot()

📜 協定

👥 相關

• inherited by BinaryFloatingPoint.

• 🅿️ Vector2D