stackoverflow January 12, 2026 Rep: 895

C++ std::optional::emplace() rejected by clang, accepted by gcc and msvc

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January 12, 2026 Score: 5 Rep: 36,769 Quality: Low Completeness: 30%

The code is valid and so gcc and MSVC are correct.

Moreover - this seems to be a bug in clang 20.1 that was already fixed in clang 21.1.

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