How can I convert a reference to any type to a reference to an array of length 1?

Question

I have an instance of type &T. How do I cast it to &[T; 1]? Something like std::slice::from_ref, except that it should return an array, instead of a slice.

Answer 1

Use array::from_ref or array::from_mut.

fn example(a: &String) -> &[String; 1] {
    std::array::from_ref(a)
}

See also:

• How to create a slice from a single element without copying that element?