Tracking Issue for VecDeque::pop_front_if & VecDeque::pop_back_if

[GrigorenkoPV]

Feature gate: #![feature(vec_deque_pop_if)]

Similar to #122741, but this time with VecDeque instead of Vec.

Public API

impl<T> VecDeque<T> {
    pub fn pop_front_if(&mut self, predicate: impl FnOnce(&mut T) -> bool) -> Option<T>;
    pub fn pop_back_if(&mut self, predicate: impl FnOnce(&mut T) -> bool) -> Option<T>;
}

Steps / History

• ACP: pop_if or Entry/Peek-like API for Vec and VecDeque libs-team#208
• Implementation: Implement VecDeque::pop_front_if & VecDeque::pop_back_if #135890
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• Vec::pop_if uses an explicit generic parameter for the predicate. But that might change (Tracking Issue for Vec::pop_if #122741 (comment)). If it does not, probably change these methods instead to be consistent.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩