How to check if internet is avaiable on mac os?

I'm using c++ in qt.
And I need to check if internet is available.

For Windows, I used win32 API. INetworkListManager::Get_IsConnectedToInternet.

But for Mac, I don't know how.
And I don't want a way to ping to a server like google.com.

I found "Reachability", but I don't know how to use it in QT.
And I briefly looked at sample of Reachability, it seems to ping to the server.

Code Block 
 Reachability * reach = [Reachability reachabilityWithHostname:@"www.google.com"];
   
  reach.reachableBlock = ^(Reachability * reachability)
  {
    dispatch_async(dispatch_get_main_queue(), ^{
      _blockLabel.stringValue = @"Block Says Reachable";
    });
  };
   
  reach.unreachableBlock = ^(Reachability * reachability)
  {
    dispatch_async(dispatch_get_main_queue(), ^{
      _blockLabel.stringValue = @"Block Says Unreachable";
    });
  };

How can I check if Internet is available?