rustlings/exercises/move_semantics/move_semantics3.rs

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2018-02-22 13:09:53 +07:00
// move_semantics3.rs
// Make me compile without adding new lines-- just changing existing lines!
// (no lines with multiple semicolons necessary!)
// Scroll down for hints :)
2018-11-10 02:31:14 +07:00
fn main() {
let vec0 = Vec::new();
let mut vec1 = fill_vec(vec0);
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
vec1.push(88);
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
}
fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
vec.push(22);
vec.push(44);
vec.push(66);
vec
}
// The difference between this one and the previous ones is that the first line
// of `fn fill_vec` that had `let mut vec = vec;` is no longer there. You can,
// instead of adding that line back, add `mut` in one place that will change
// an existing binding to be a mutable binding instead of an immutable one :)