EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Jul 23·5 min read
The PImpl idiom and the C++26 std::indirect type
TL;DR
The PImpl idiom in C++ allows for the separation of a class's interface from its implementation, reducing compile-time dependencies. C++26 introduces the std::indirect type, simplifying the implementation of this pattern.
✦ Why It Matters
Consider adopting the PImpl idiom in your C++ projects to improve code maintainability.
Key Takeaways
- Implement PImpl using std::indirect for better memory management.
- Ensure constness is propagated correctly in your classes.
- Utilize valueless_after_move() to check object state after moves.
- Avoid manual resource management by leveraging std::indirect.
How It Works
std::indirect manages a dynamically allocated object while behaving like a member variable, allowing for deep copies and const propagation. This means that when a class using std::indirect is copied, the owned object is also copied, and const access is enforced through const std::indirect objects.