clap_derive: support fixed arrays as shortcut for number_of_values = N

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Issue by CreepySkeleton
Sunday Feb 09, 2020 at 15:03 GMT
Originally opened as clap-rs/clap#1682

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Transferred from: TeXitoi/structopt#349

It would be even better if fixed sized arrays or tuples with different value types would be supported directly:

#[derive(Clap)]
struct Args {
    #[clap(long)]
    range: [u32; N], // implies `required = true` and `number_of_values = N` 

    #[clap(long)]
    range: Option<[u32; N]>, // `number_of_values = N` 
}

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Comment by pksunkara
Monday Mar 02, 2020 at 17:22 GMT

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Could you create a separate issue for the tuples?

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Comment by cecton
Thursday Mar 26, 2020 at 15:29 GMT

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Yeah actually having something automatic for tuples would solve my issue as I won't have to fight with Vec. (But I still believe the current impl of Vec is wrong but I didn't read your answer yet.)

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Comment by CreepySkeleton
Saturday Apr 18, 2020 at 13:30 GMT

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This change would be breaking if implemented after 3.0 is out, so triaging for 3.0