Zig: Pointer Stability for ArrayLists
The Zig programming language is introducing a new 'Pointer Stability' feature to its ArrayList containers to prevent memory safety bugs. This update allows developers to lock and unlock pointers to ensure data integrity when underlying memory buffers are resized.
Why it matters
Memory safety is a critical concern in systems programming; this update provides a specific mechanism to prevent common segmentation faults in high-performance code.
Download Learn News Source Join a Community Zig Software Foundation Devlog Download Learn News Zig Software Foundation Devlog Source Join a Community Devlog This page contains a curated list of recent changes to main branch Zig.
This page contains entries for the year 2026 . Other years are available in the Devlog archive page .
Pointer Stability Locks were added to std ’s Hash Map containers in 2024 . A pull request initially opened by Leo Emar-Kar in 2025 now brings this technique for ensuring memory safety to std.ArrayList .
To make use of this in your code, add a call to lockPointers() when you first store a pointer to an element or a slice of elements backed by the ArrayList , and call unlockPointers() when those pointers are no longer needed.
Get smarter about the news
Sign up free for a feed built around what you actually care about, Dive Deeper research on any story, and the full text of every article.
Create free accountAlready have an account? Sign in