Feature gate: #![feature(vec_from_fn)]

This is a tracking issue for the Vec::from_fn method.

Public API

impl<T> Vec<T> {
    pub fn from_fn<F>(length: usize, f: F) -> Self
    where
        F: FnMut(usize) -> T,
    {
        (0..length).map(f).collect()
    }
}

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• ACP: Support vec![const { ... }; n] syntax for creating a Vec of non-Clone values libs-team#484 (comment)
• Implementation: Implement Vec::from_fn #149699
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.