I'm trying to build an array based on an input array size, so I've the below code: fn foo(x: &[&Vec<i32>], y: &[&Vec<i32>]) -> Vec<i32> { let n = x.len(); // 3 let array: [Vec<i32>; n] = Default::default(); } But I got the below error: error[E0435]: attempt to use a non-constant value i…

Attempt to use a non-constant value in a constant

kornel September 3, 2019, 10:23pm 3

Use vec![Default::default(); n] or Vec::with_capacity(n) and push to it.

Use arrays of fixed length to save space and time?

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