protocol ExpressibleByFloatLiteral

A type that can be initialized with a floating-point literal.

The standard library floating-point types---Float, Double, and Float80 where available---all conform to the ExpressibleByFloatLiteral 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 ExpressibleByFloatLiteral conformance to your custom type, implement the required initializer.

Inheritance View Protocol Hierarchy →
Associated Types

A type that represents a floating-point literal.

Valid types for FloatLiteralType are Float, Double, and Float80 where available.

Import import Swift


init(floatLiteral:) Required

Creates an instance initialized to the specified floating-point value.

Do not call this initializer directly. Instead, initialize a variable or constant using a floating-point literal. For example:

let x = 21.5

In this example, the assignment to the x constant calls this floating-point literal initializer behind the scenes.

value: The value to create.


init(floatLiteral value: Self.FloatLiteralType)