I have a simple struct:

#[derive(Debug, Clone)]
pub struct LabeledStrings {
    label: String,
    strings: Vec<String>,
}

impl LabeledStrings {
    pub fn new(label: String, strings: Vec<String>) -> LabeledStrings {
        LabeledStrings { label, strings }
    }

    pub fn get_label(self) -> String {
	self.label
    }

    pub fn get_vals(self) -> Vec<String> {
	self.strings
    }
}

I have a Vector of these things, and I want to sort it by the labels:

   let mut  keys: Vec<LabeledStrings> =  ...
    keys.sort_by_key(|ls| ls.clone().get_label());

When I tried it without the .clone() the compiler complained that I was moving ls. I am missing something in how to use methods like map, filter, sort_by_key when the elements are structures, and thus the parameters are references to structures. to get rid of the need to clone, do I need to make the methods take &self instead of self?
Thanks,
Joel

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