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Cairo Deref Coercion

Explain Cairo deref coercion with Deref/DerefMut traits and Target associated type; use when a request involves wrapper types, field access through wrappers, or deref behavior in Cairo.

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Cairo Deref Coercion

Overview

Guide how deref coercion works via Deref and DerefMut, and when it applies.

Quick Use

  • Read references/deref-coercion.md before answering.
  • Show the Deref trait and a wrapper example.
  • Note that DerefMut only applies to mutable variables.

Response Checklist

  • Implement Deref<T> with type Target and fn deref(self: T) -> Target.
  • Use deref coercion to access fields on the wrapped type.
  • Use DerefMut when you need mutable-only coercion; it does not make the target mutable by itself.

Example Requests

  • "Why can I access fields on a wrapper type?"
  • "How do I implement Deref for a custom type?"
  • "Why does DerefMut require a mut variable?"

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