EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·26d ago·8 min read
Unsizing unsized values
TL;DR
A new approach in Rust allows for dynamic type handling similar to Go's `interface{}`, enabling downcasting of unsized values like strings without unnecessary allocations. This method leverages custom vtables to manage type metadata effectively.
✦ Why It Matters
Implement this vtable approach to handle unsized types in Rust for more efficient dynamic type management.
Key Takeaways
- Utilize custom vtables for dynamic type management in Rust.
- Avoid unnecessary allocations when handling strings and other unsized types.
- Implement the `Host` struct to manage type metadata effectively.
- Explore downcasting techniques for unsized types to enhance flexibility.
How It Works
The method constructs a custom vtable that retains metadata about unsized types, allowing for efficient downcasting. By creating a fat pointer that includes both the data pointer and the vtable, the approach enables the recovery of type information, facilitating dynamic type handling similar to Go's `interface{}`.