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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?

stijn
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vladon
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1 Answers1

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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.

EricWF
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  • This could use a clarification, that 'it' refers to the standards ban on reference types in `std::optional` – sp2danny Jun 12 '19 at 10:28