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How to initialize a struct containing an array in Rust?


Rust does not implement Default for all arrays because it does not have non-type polymorphism, as such Default is only implementable for a handful of sizes.

You can, however, implement a default for your type:

impl Default for Histogram {
    fn default() -> Histogram {
        Histogram {
            sum: 0,
            bins: [0u32, ..256],
        }
    }
}

Note: I would contend that implement Default for u32 is fishy to start with, why 0 and not 1? or 42? There is no good answer, so no obvious default really.


Categories : Arrays

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