NSLog is unavailable

Question

I have following function:

func myNSLog(_ givenFormat: String, _ args: CVarArg..., _ function:String = #function) {
        let format = \"\\(function): \\(g         


        

Answer 1

Similar as in C, you cannot pass a variable argument list directly to another function. You have to create a CVaListPointer (the Swift equivalent of va_list) and pass that to the NSLogv variant:

func myNSLog(_ givenFormat: String, _ args: CVarArg..., _ function:String = #function) {
    let format = "\(function): \(givenFormat)"
    withVaList(args) { NSLogv(format, $0) }
}

(Swift 3 code.)