Is it possible to access struct fields from within a trait?

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This sounds like you’re misunderstanding how traits work. Traits can’t have fields. If you want to provide access to a field from a trait, you need to define a method in that trait (like, say, get_blah).

If you’re asking whether you can access fields of a struct from within that struct’s implementation of a trait, then yes. The struct knows it’s own type, so there’s no problem.

trait Pet {
    fn is_smelly(&self) -> bool;
}

struct Dog {
    washed_recently: bool,
}

impl Pet for Dog {
    fn is_smelly(&self) -> bool {
        !self.washed_recently
    }
}

If you’re writing a default implementation of a trait (i.e. defining a method body within the trait), then no, you can’t access fields. A default implementation can only use methods that are defined on the trait or in a super trait.

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