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deepmind.google·6d ago
AI Engineering
Lobsters·26d ago·5 min read
C++26: Trivial infinite loops are no longer undefined behaviour
TL;DR
C++26 has redefined the treatment of trivial infinite loops, now classifying them as well-defined behavior. This change prevents compilers from optimizing away such loops, ensuring consistent program execution.
✦ Why It Matters
Update your C++ code to utilize infinite loops safely under C++26 standards.
Key Takeaways
- Review existing code for infinite loops and their behavior.
- Test your code with Clang to ensure expected outputs.
- Adopt C++26 standards for new projects to avoid UB.
- Educate your team on the implications of this change.
Full Summary
Previously, a simple infinite loop in C++, like 'while (true);', was considered undefined behavior (UB), allowing compilers to make aggressive optimizations. For instance, Clang could eliminate the loop entirely, leading to unexpected outputs, such as printing 'Hello world!'
when the loop was removed. With the introduction of C++26, these trivial infinite loops are now classified as well-defined behavior, meaning compilers must treat them as valid code that does not terminate.
This change aims to enhance code predictability and reliability, allowing developers to use infinite loops without fear of unintended consequences. The implications are significant for software development, as it encourages clearer coding practices and reduces the risk of subtle bugs caused by compiler optimizations.