CODEWITHSUNDEEP
swift
Michael
Michael

Reputation: 677

Iterate over functions in Swift

I am feeling a bit stupid... I want to get rid of code duplication and so I need to iterate over some functions (a couple of Darwin geometric ones). But when I try

for function in [Darwin.acos, Darwin.cos, Darwin.sin] { print(function(1.0)) }

I get the error "Ambiguous use of 'acos'". I also tried Darwin.acos(Double) and got "Ambiguous reference to member 'acos'" and Darwin.acos { $0 } (and similar) without any luck.

Is it possible to do this? Thank you!

Upvotes: 0

Views: 88

Answers (2)

Martin R
Martin R

Reputation: 539975

In addition to what Sulthan said:

In a future version of Swift these functions are also available as static functions on the floating point types, compare SE-0246 Generic Math(s) Functions:

let functions = [Double.acos, Double.cos, Double.sin]
for function in functions { print(function(1.0)) }

You can try this now with a current Swift developer snapshot from https://swift.org/download/#snapshots.

Upvotes: 2

Sulthan
Sulthan

Reputation: 130152

You have to specify the type somewhere:

let functions: [(Double) -> Double] = [Darwin.acos, Darwin.cos, Darwin.sin]
for function in functions { print(function(1.0)) }

since the functions are overloaded for different floating point types:

public func acos(_: Float) -> Float
public func acos(_: Double) -> Double
public func acos(_: Float80) -> Float80

Upvotes: 2

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