Rust Callback APIs for Host Languages: Function Pointers, User Data, and Lifetime Rules

A practical two-hour session on Rust Callback APIs for Host Languages, focused on Function Pointers, User Data, and Lifetime Rules. The session treats Rust as a native component exposed through C-compatible boundaries, with attention to packaging, ownership, host-runtime tests, and failure handling.

Audience: entry-level and intermediate developers who want a practical engineering session, not a language tour.

Outcomes:

• Explain the practical boundaries of Rust Callback APIs for Host Languages
• Apply Function Pointers in a small working example
• Apply User Data in a small working example
• Apply and Lifetime Rules in a small working example

Format: two hours with a short framing walkthrough, a concrete example, discussion of tradeoffs, and a closing checklist for practice.