Do these two lines of code actually do anything?

[ewmailing]

In DnssdServiceWatcher.h, there are two lines I am struggling to understand what they do:

    // C++ dsssd service changed callback
    typedef std::function<void(DnssdServiceWatcher^ watcher, DnssdServiceUpdateType update, DnssdServiceInfoPtr info)> DnssdServiceChangedCallbackType;

    // WinRT Delegate
    delegate void DnssdServiceUpdateHandler(DnssdServiceWatcher^ sender, DnssdServiceUpdateType update, DnssdServiceInfoPtr info);

I commented them out, and the program still seemed to work as they don't seem to be directly used in the codebase. But I'm wondering if I'm missing something because there is a lot I still need to learn about WinRT and C++CX.