Why operator- in std::optional result in a UB when *this is not valid?

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Peter Schneider
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Why operator- in std::optional result in a UB when *this is not valid?
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Thanks to all those great people for their contributions!

(stackoverflow.com/users/3316009/calvin)calvin
(stackoverflow.com/users/4117728/463035818-is-not-an-ai)463035818_is_not_an_ai
(stackoverflow.com/users/4706785/peter)Peter
A special thanks goes out to the (https://stackoverflow.com/questions/77644824/why-operator-in-stdoptional-result-in-a-ub-when-this-is-not-valid)Stackexchange community

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