Cannot convert value of type 'Int' to expected argument type '(inout UnsafeMutableBufferPointer<_>, inout Int) throws -> Void'

Question

This line var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: 0) error throwing.

Error Message:

Cannot convert value of type 'Int' to expected argument type '(inout UnsafeMutableBufferPointer<_>, inout Int) throws -> Void'

This is my Code:

struct MailTemplate {
    let destination = "test@gmail.com"
    let subject = "Test"
    let body:String

    init(){
        let appVersion: String! = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
        var platform: String {
            var size: Int = 0
            sysctlbyname("hw.machine", nil, &size, nil, 0)
            var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: 0)
            sysctlbyname("hw.machine", &machine, &size, nil, 0)
            return String.fromCString(machine)!
        }
        body = "Email Body"
    }
} 

Answer 1

inout parameters are those that are going to be modified by the function we are passing it to. Therefore, you need to pass it as &size .

Answer 2

I got Answer,

initializingWith: {_,_ in}

Like that:

var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: {_,_ in})