Tracking Issue for VecDeque::extract_if

Feature gate: #![feature(vec_deque_extract_if)]

This is a tracking issue for https://github.com/rust-lang/libs-team/issues/673

Public API

Almost the same as vec::ExtractIf but for VecDeque:

impl<T, A: Allocator> VecDeque<T, A> {
    pub fn extract_if<F, R>(&mut self, range: R, filter: F) -> ExtractIf<'_, T, F, A>
    where
        F: FnMut(&mut T) -> bool,
        R: RangeBounds<usize>,
    {
        ExtractIf::new(self, filter, range)
    }
}

pub struct ExtractIf<'a, T, F, A: Allocator = Global> {
    vec: &'a mut VecDeque<T, A>,
    idx: usize,
    end: usize,
    del: usize,
    old_len: usize,
    pred: F,
}

Steps / History

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

• ACP: https://github.com/rust-lang/libs-team/issues/673
• Implementation: https://github.com/rust-lang/rust/pull/147780
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• None yet.

Read the public API and the linked ACP and implementation PR first; the implementation step is already checked off. The remaining work is the final comment period and stabilization PR, so verify the feature lifecycle guidance and current issue status before attempting any contribution.