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C++ bitwise operations can turn enum complements into unexpected values

dryperspective.github.io 16 min read Editor score 7/10

The article examines how integral promotions and undefined behavior affect bitwise operations on C++ enums, prompted by a proposal for opt-in bitmask operations. Engineers working with low-level C++ can use this context to avoid subtle type and value bugs.

What

The excerpt examines C++ bitwise operations while discussing a proposal for built-in bitmask operations on enums.

How

Integral types smaller than int are promoted for bitwise operations; converting a nonzero result to bool yields true and discards its bit pattern.

Why it matters

Understanding these conversions helps engineers avoid surprising boolean results and unintended narrowing in low-level code.

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