No useful and reliable way to detect integer overflow in C/C++?

Question

No, this is not a duplicate of How to detect integer overflow?. The issue is the same but the question is different.

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The gcc compiler can optimize away an

Answer 1

Ask yourself: how often do you actually need checked arithmetic? If you need it often you should write a checked_int class that overloads the common operators and encapsulate the checks into this class. Props for sharing the implementation on an Open Source website.

Better yet (arguably), use a big_integer class so that overflows can’t happen in the first place.