You are looking for std::nullopt instead of nullptr.
std::vector<std::pair<int, std::optional<bool> > > vec1 =
{ {1, true}, {2,false}, {3,std::nullopt} };
You are looking for std::nullopt instead of nullptr.
std::vector<std::pair<int, std::optional<bool> > > vec1 =
{ {1, true}, {2,false}, {3,std::nullopt} };
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