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asynchronousclosuresgtkvala

Vala async closure

I am trying to make a async closure because I call another async function inside. Some I am trying to do something like this:

void connect_on_button_click () {
    some_button.connect (() => {
        var val = yield some_async_function ();
        // Do something with the value...
    });
}

But vala compiler gives error. So currently my solution is passing a defined async function such as:

async void on_button_click () {
    var val = yield some_async_function ();
    // Do something with the value...
}

void connect_on_button_click () {
    some_button.connect (on_button_click);
}

But I wonder if it is possible to mark a closure as async so I don't have to create another function?

Solution

  • Async lambdas/closures/delegates currently aren't supported.

    However if your example above reflects your actual use case then you don't actually need them, you just need to use the async_method.begin(…) form to call the async method:

    void connect_on_button_click () {
    some_button.connect (() => {
        some_async_function.begin();
    });
}