How to wrap a C++11 callback?

I'm using Casablanca C++ Rest SDK for http connections. Here is a basic piece of code that makes a http request.

Copied from Casablanca documentation:

// Creates an HTTP request and prints the length of the response stream. pplx::task<void> HTTPStreamingAsync() { http_client client(L"http://www.google.com"); // Make the request and asynchronously process the response. return client.request(methods::GET).then([](http_response response) { // Response received, do whatever here. }); } 

This will do an asynchronous request and do a callback when done. I need to make my own class that uses these codes and I want to wrap it to my own callback.

For simplicity, assume that I want to make a class that has method which print html code of google.com.

So I expected something like this:

MyClass myObject; myObject.getGoogleHTML([](std::string htmlString) { std::cout << htmlString; }); 

I searched and read related articles like:

1. C++ class member callback simple examples
2. C++11 styled callbacks?
3. Friday Q&A 2011-06-03: Objective-C Blocks vs. C++0x Lambdas: Fight!

But I'm still a bit confused as I get used with completion block in Objective-C. How can I construct such a class that wraps callback?