Bertwim van Beest questions

• Iterating over an enum class: it works, but is it conforming the standard?
• gcc -std=c++20 compiler flag -Wrestrict not understood. Is the warning justified?
• Why default move constructor cannot be created in this example [duplicate]
• std::vector and move constructible elements [duplicate]
• How to enforce move semantics when a vector grows?

Bertwim van Beest answers