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> Don’t ask. If you’re not one of the 5 or so people in the world who already know what this is, you don’t want or need to know.

The attitude rings true though. I am convinced that C++ is proof that we have discovered alien technology, and it is awful.

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The thing is that there is probably a lot of existing C++ code that is UB without std::launder (similarly to aliasing rules.) The main problem is that the C++ object lifetime rules are not well understood by most people writing C++ code.

I hadn't even considered the task of going through old code and using this to make it more compliant, this is a great use case for this feature.

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