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deepmind.google·6d ago
AI Engineering
Hacker News·Aug 31·5 min read
C++26: Standard Library Hardening Experiments
TL;DR
C++26 introduces a 'hardened' standard library that transforms undefined behavior into detectable contract violations, enhancing memory safety. This feature aims to prevent common programming errors in C++ applications.
✦ Why It Matters
Enable hardened mode in your C++26 projects to catch errors early and improve safety.
Key Takeaways
- Use hardened mode to detect out-of-bounds access in containers.
- Enable _GLIBCXX_ASSERTIONS in GCC for runtime checks.
- Explore Clang's hardening modes for different safety levels.
- Understand that hardening does not replace good coding practices.
How It Works
C++26 introduces a contracts model that specifies preconditions for library functions. In a hardened implementation, violating these preconditions results in a contract violation that terminates execution, rather than allowing undefined behavior to occur.
This mechanism helps catch programming errors early.