Problems with borrowing Traits (lemmy.world)

submitted 3 years ago by djtech@lemmy.world to c/rust@programming.dev

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crosspostato da: https://lemmy.world/post/1916287

Hi everybody, I'm new to Rust.

So, I have a struct Panel which contains a data widget which implements the trait Widget I have to implement a function for Panel that uses another function that requires a type that implements Widget.

I tried Box<T>, Rc<T>, Box<dyn Widget, &T, but nothing, always compiler errors.

How can I fix this?

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[-] anlumo@feddit.de 3 points 3 years ago

That function takes ownership of the Widget, there's no borrowing here. Maybe that's the problem, that you're passing a reference instead of the actual object?

So, if you have a Panel containing the Widget, the function you're calling render_widget in has to take self, not &self or &mut self.

Alternatively, you can use data: Option<T> in Panel, let the function take &mut self and then use self.data.take() to move it out of self.

[-] djtech@lemmy.world 2 points 3 years ago

I checked the code and noticed that I wrote &self as the parameter 🤦🏻

Now everything works. Thanks man

this post was submitted on 21 Jul 2023

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