How can I access everything inside this function inside a main function when this function is called inside the main?

[sdf1444]

Hi

How can I access everything inside this function inside a main function when this function is called inside the main?

fn on_message() -> Callbacks<'a, T> {
let mut mc = m.callbacks(());
mc.on_message(|_,msg| {
    if ! msg.retained() {
        if bonzo.matches(&msg) {
            println!("bonzo {:?}",msg);
        } else
        if frodo.matches(&msg) {
            println!("frodo {:?}",msg);
        }
    }
mc
});

}

Link to the mqtt client library I use: GitHub - stevedonovan/mosquitto-client

Thanks

[skysch]

Who is going to access what? The main function can't do anything while a function it calls is on the stack, and you can access anything you like with a debugger. So your question doesn't make much sense as is.

[sdf1444]

Inside main this function is called and main will have access to everything inside this function.

[skysch]

What is "everything"? The only thing inside that function is a Callbacks<'a, T>, which isn't in that function once it is returned, so what exactly do you want to do?

[sdf1444]

I want the callback to be executed once the function is called in main.

[ExpHP]

Write it as a closure inside main:

fn main() {
    let on_message = || -> Callbacks<'a, T> {
        let mut mc = m.callbacks(());
        mc.on_message(|_,msg| {
            if ! msg.retained() {
                if bonzo.matches(&msg) {
                    println!("bonzo {:?}",msg);
                } else
                if frodo.matches(&msg) {
                    println!("frodo {:?}",msg);
                }
            }
        mc
    });
}

[sdf1444]

Does that mean I no longer need to call the on_message function in main?