Need help with delegates and vibed

[Alex Parrill via Digitalmars-d-learn]

On Saturday, 19 March 2016 at 19:53:01 UTC, Suliman wrote:
> Thanks! I am understand a little bit better, but not all.
>
> ```
> shared static this()
> {
> 	auto settings = new HTTPServerSettings;
> 	settings.port = 8080;
>
> 	listenHTTP(settings, &handleRequest);
> }
>
> void handleRequest(HTTPServerRequest req,
>                    HTTPServerResponse res)
> {
> 	if (req.path == "/")
> 		res.writeBody("Hello, World!", "text/plain");
> }
> ```
> https://github.com/rejectedsoftware/vibe.d/blob/master/source/vibe/http/server.d#L104
> I expected to see in listenHTTP() function some processing but 
> it's simply get args and then do return:
> return listenHTTP(...)
>
> Could you explain why it's do so?
>
> --
> Where is constructor of this class? 
> http://vibed.org/api/vibe.http.client/HTTPClientRequest
>
> How I should use it if have only docs, and do not have 
> examples? (I am trying understand how to use docs without 
> cope-past examples)

The function is overloaded; it's calling the main implementation 
at line 77 after transforming the arguments.

The constructor for HTTPClientRequest is likely undocumented 
because you should not construct it yourself; vibe.d constructs 
it and passes it to the function you register with listenHTTP.