CODEWITHSUNDEEP
rustborrow-checker
user4063815
user4063815

Reputation:

Cannot move out of borrowed content for Box::into_raw on self.attribute

pub struct Themepark {
    attraction: Box<Attraction>
}

Note: Attraction is a trait!

impl Themepark {

    pub fn open(&mut self) -> Result<(), ()> {

        let attraction = Box::into_raw(self.attraction);

    ...
    }

}

that gives me 

> cannot move out of borrowed content

for self.attraction inside Box::into_raw

Now I do understand what that particular error-message means, but I don't understand how to solve it as Box::into_raw expects a Box<T> as argument, not a reference or anything.

https://doc.rust-lang.org/std/boxed/struct.Box.html#method.into_raw

Upvotes: 1

Views: 569

Answers (1)

ljedrz
ljedrz

Reputation: 22273

You won't be able to use that function on self.attraction while mutably borrowing self; as per the very first line in its docs:

Consumes the Box

You either need to .clone() it or use a function that consumes self (e.g. fn open(self)).

I recommend re-reading The Rust Book's chapter on Ownership.

Upvotes: 2

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