Is
std::optional<std::reference_wrapper<some_type>>
is conforming to the Standard (or draft) of C++17?
The Standard explicitly says, that std::optional for a reference type is ill-formed. But does it include reference_wrapper?
std::optional<std::reference_wrapper<T>> - is it OK?
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Yes. That is OK. It does not include reference_wrapper because reference_wapper isn't a reference type. Only actual reference types are disallowed.