seasocks | Simple , small , C++ embeddable webserver with WebSockets | Websocket library

Most of this is me restating the quick tutorial, but hopefully in a clearer way.

The function execute() is a method on the server object, and it accepts a "function to call" on the correct thread. Your example is trying to construct a new Server, then call its execute method with an initializer list (I think!).

To do useful work, though, you need to know which clients to send messages to. The server doesn't keep track of that: it delegates that responsibility to the individual Handlers. Think of the Handler as like a single web page handler: a website doesn't have "clients" but each page does (the clients that are viewing it)

You'll need to make a Handler for the page you want (e.g. the ChatHandler in the tutorial). That handler will remember the list of clients attached to it: