You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: network_helper.rs
    path of file: ./repos/sysinfo/src/windows
    
    the code of the file until where you have to start completion: // Take a look at the license at the top of the repository in the LICENSE file.

use std::collections::{HashMap, HashSet};
use std::net::IpAddr;
use std::ptr::{null_mut, NonNull};

use windows::Win32::Foundation::{ERROR_BUFFER_OVERFLOW, ERROR_SUCCESS};
use windows::Win32::NetworkManagement::IpHelper::{
    GetAdaptersAddresses, GAA_FLAG_SKIP_ANYCAST, GAA_FLAG_SKIP_DNS_SERVER, GAA_FLAG_SKIP_MULTICAST,
    IP_ADAPTER_ADDRESSES_LH, IP_ADAPTER_UNICAST_ADDRESS_LH,
};
use windows::Win32::Networking::WinSock::{
    AF_INET, AF_INET6, AF_UNSPEC, SOCKADDR, SOCKADDR_IN, SOCKADDR_IN6,
};

use crate::common::{IpNetwork, MacAddr};

/// this iterator yields an interface name and address
pub(crate) struct InterfaceAddressIterator {
    /// The first item in the linked list
    buf: *mut IP_ADAPTER_ADDRESSES_LH,
    /// The current adapter
    adapter: *mut IP_ADAPTER_ADDRESSES_LH,
}

impl InterfaceAddressIterator {
    fn new() -> Self {
        Self {
      
    
pub(crate) unsafe fn get_interface_address() -> Result<InterfaceAddressIterator, String> {
    // https://learn.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getadaptersaddresses#remarks
    // A 15k buffer is recommended
    let mut size: u32 = 15 * 1024;
    let mut ret = ERROR_SUCCESS.0;
    let mut iterator = InterfaceAddressIterator::new();

    // https://learn.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getadaptersaddresses#examples
    // Try to retrieve adapter information up to 3 times
    for _ in 0..3 {
        iterator = iterator.realloc(size as _)?;
        ret = GetAdaptersAddresses(
            AF_UNSPEC.0.into(),
            GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_DNS_SERVER,
            None,
            Some(iterator.buf),
            &mut size,
        );
        if ret == ERROR_SUCCESS.0 {
            return Ok(iterator);
        } else if ret != ERROR_BUFFER_OVERFLOW.0 {
            break;
        }
        // if the given memory size is too small to hold the adapter information,
        // the SizePointer returned will point to the required size of the buffer,
        // and we should continue.
        // Otherwise, break the loop and check the return code again
    }

    Err(format!("GetAdaptersAddresses() failed with code {ret}"))
}