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Cairo References Snapshots

Explain Cairo references, snapshots (`@`), `ref` parameters, and desnap (`*`); use when a request involves borrowing, avoiding moves, or mutating data through references in Cairo.

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Cairo References and Snapshots

Overview

Explain when to pass by value, snapshot, or mutable reference, and how to read or mutate safely.

Quick Use

  • Read references/references-snapshots.md before answering.
  • Show the correct parameter form (value, @value, or ref value).
  • Use *snapshot only for Copy types.

Response Checklist

  • Use snapshots (@T) to read without moving ownership.
  • Use ref when the callee must mutate and the caller must regain ownership.
  • Remind that ref requires a mut variable at the call site.
  • Call out that snapshots are immutable and cannot be mutated directly.

Example Requests

  • "Why does passing this array move ownership?"
  • "How do I modify a struct inside a function and keep it?"
  • "What does @ mean in a type annotation?"

Cairo by Example

teddyjfpender/skill-issues/tree/main/skills/cairo-references-snapshots commit d11af2d3d1

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Frequently asked questions

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