init(exactly:)

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

Declaration

init?(exactly other: Double)

Parameters

other:
The value to use for the new instance.

Discussion

If other can’t be represented as an instance of Float80 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 = Float80(exactly: x)
// y == Optional.some(21.25)

let z = Float80(exactly: Double.nan)
// z == nil