Re: [Vala] Proposal for an improved delegate/lambda handling

[Yu Feng <rainwoodman gmail com>]

On Sat, 2008-10-18 at 22:57 +0200, Ali Sabil wrote:
> Hi all,
> 
> I would like to start a discussion about a small syntactic sugar
> addition to Vala, that would in my opinion slightly improve the
> situation with asynchronous code. The following code sample should be
> self explanatory about my proposal:
> 
> delegate bool HttpResponseCallback (string response);
> 
> public class HttpClient : Object {
>     public void post_request (string request, HttpResponseCallback cb)
> {
>         cb ("Hello world");
>     }
> }
> 
> // Current State
> var client = new HttpClient ();
> client.post_request("GET ....",  (response) => {
>         debug ("got response %s", response);
>         return true;
>     }
> );
> 
> 
> // Proposed syntax:
> // Vala would basically use the "pseudo-lambda" expression
> // following the method call as a parameter to the method call
> client.post_request("GET ....") (string response) {

What about 
client.post_request("GET ..."): 
(response) => {
   ....
}, 
(second_callback) => {
    ....
};

Adding the colon and commas might ease the parser.


>     debug ("got response %s", response);
>     return true;
> }
> 
> 
> I am very open to comments and suggestions.
> 
> Cheers,
> 
> --
> Ali
> 
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