A type that can be initialized with a floating-point literal.
SDK
- Xcode 8.0+
Framework
- Swift Standard Library
Declaration
protocol ExpressibleByFloatLiteral
Overview
The standard library floating-point types—Float, Double, and Float80 where available—all conform to the Expressible protocol. You can initialize a variable or constant of any of these types by assigning a floating-point literal.
// Type inferred as 'Double'
let threshold = 6.0
// An array of 'Double'
let measurements = [2.2, 4.1, 3.65, 4.2, 9.1]
Conforming to ExpressibleByFloatLiteral
To add Expressible conformance to your custom type, implement the required initializer.