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Associated Types

Associated Types

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I want to calculate how far my car will travel in 3 hours if it’s going at a certain speed. I live in a country that uses the metric system, so I’m going to define two helper structs, Kmh (kilometers per hour) and Km (kilometers).

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#[derive(Debug, Clone, Copy)]
struct Kmh {
    value: u32
}
#[derive(Debug, Clone, Copy)]
struct Km {
    value: u32
}

Defining a struct with a single field like this is a great way to protect against programmer error. Now it’s impossible to accidentally compare Kmh (a unit of speed) against Km (a unit of distance). In any event, I can now write a method on Kmh to tell me how far my car has ...

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