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iddqd, or the hardest kind of unsafe Rust

The article discusses iddqd, a Rust library developed at Oxide Computer Company for creating maps where keys are borrowed from values, which is extensively used in their Omicron control plane. It delves into the challenges of using unsafe Rust code to implement this functionality safely and efficiently, while ensuring correctness in critical infrastructure. The author explains the motivation behind the library and how it improves upon standard Rust collections by maintaining key-value relationships more effectively.

Background

Rust is a systems programming language known for its memory safety guarantees, but sometimes developers need to use 'unsafe' code for low-level operations. Oxide Computer Company develops data center infrastructure software where performance and reliability are critical.

Source
Lobsters
Published
Jun 3, 2026 at 12:20 AM
Score
7.0 / 10