protocol
ExpressibleByFloatLiteral
A type that can be initialized with a floating-point literal.
Conforming Types | BinaryFloatingPoint |
---|---|
Associated Types |
|
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.
Initializers
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.
- Parameter value: The value to create.
Declaration
init
(
floatLiteral
value
:
Self
.
FloatLiteralType
)
Valid types for
FloatLiteralType
areFloat
,Double
, andFloat80
where available.