Swift pointer problems with MACH_TASK_BASIC_INFO

Question

I am trying to convert an ObjC stackoverflow answer to Swift and failing. It looks like I am passing a UnsafeMutablePointer when I

Answer 1

Nate’s answer is excellent but there’s a tweak you can make to simplify it.

First, rather than allocating/deallocating the task_basic_info pointer, you can create the struct on the stack, then use withUnsafeMutablePointer to get a pointer directly to it which you can pass in.

func report_memory() {
    var info = mach_task_basic_info()
    var count = mach_msg_type_number_t(sizeofValue(info))/4

    let kerr: kern_return_t = withUnsafeMutablePointer(&info) {

        task_info(mach_task_self_,
            task_flavor_t(MACH_TASK_BASIC_INFO),
            task_info_t($0),
            &count)

    }

    if kerr == KERN_SUCCESS {
        println("Memory in use (in bytes): \(info.resident_size)")
    }
    else {
        println("Error with task_info(): " +
            (String.fromCString(mach_error_string(kerr)) ?? "unknown error"))
    }
}