cairo-storage-vecs

name	cairo-storage-vecs
description	Explain Starknet storage vectors with VecTrait and MutableVecTrait, element addressing, and operations; use when a request involves Vec-based storage in Cairo contracts.

Cairo Storage Vecs

Overview

Explain how storage vectors are modeled and accessed in Cairo smart contracts.

Quick Use

• Read references/storage-vecs.md before answering.
• Use Vec<T> only inside the storage struct.
• Use len, get, at, append, and pop from the trait APIs.

Response Checklist

• Mention that the length is stored at the base slot.
• Explain element slot derivation from the base address and index.
• Note that Vec types are storage-only and cannot be instantiated as normal variables.

Example Requests

• "How do I append to a storage Vec?"
• "How is the element address computed for a storage Vec?"
• "Why can't I create Vec in a function?"