M02 Resource

What it does

The M02 Resource skill assists with managing resources, specifically focusing on choosing appropriate smart pointers in Rust code. It guides users through a decision-making process to determine the correct ownership pattern and thread safety requirements for data structures, helping prevent common errors like memory leaks or runtime panics. This skill doesn't directly manage files or links; it helps developers select the right tools (smart pointers) for managing those resources within their code.

When to use it

• When deciding between Box, Rc, Arc, and Weak smart pointers in Rust.
• To troubleshoot memory management issues like potential reference cycles or unexpected panics.
• When needing to determine if shared ownership is required, and whether multi-threading needs to be supported.
• For understanding the implications of interior mutability using Cell or RefCell.

Key capabilities

• Provides guidance on choosing smart pointers based on ownership (single vs. shared) and thread safety requirements.
• Offers a decision flowchart for selecting appropriate pointer types (Box, Rc, Arc, Weak, Cell, RefCell).
• Suggests solutions to common errors related to memory management and interior mutability.
• References other skills (m07-concurrency, m03-mutability, m12-lifecycle) for deeper dives into specific areas.

Example prompts

• "I need a single owner heap data structure – what should I use?"
• "How do I avoid memory leaks when using shared ownership?"
• "What's the difference between Rc and Arc, and when should I use each?"

Tips & gotchas

• This skill focuses on smart pointer selection in Rust, not general resource management.
• Understanding Rust’s ownership model is crucial for effectively using this skill.
• Consider the concurrency model (single-threaded vs. multi-threaded) as it significantly impacts the choice of smart pointers.