Rust Trait Objects Are Just a Pointer and a Vtable
This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.
A trait object in Rust is a fat pointer. That statement is precise, not metaphorical. Every &dyn Trait , Box , and *const dyn Trait occupies two machine words: one word holds the address of the concrete value, and the other holds the address of a vtable. The vtable is a static structure generated b…
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- 2026-09-06 06:51 · DEV Community — AI
Rust Trait Objects Are Just a Pointer and a Vtable
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