Build HashSet from a vector in Rust

Question

I want to build a HashSet from a Vec. I\'d like to do this

1. in one line of code,
2. copying the data only once,<

Answer 1

The following should work nicely; it fulfills your requirements:

use std::collections::HashSet;
use std::iter::FromIterator;

fn vec_to_set(vec: Vec) -> HashSet {
    HashSet::from_iter(vec)
}

from_iter() works on types implementing IntoIterator, so a Vec argument is sufficient.

Additional remarks:

• you don't need to explicitly return function results; you only need to omit the semi-colon in the last expression in its body

• I'm not sure which version of Rust you are using, but on current stable (1.12) to_iter() doesn't exist