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Showing content from https://en.cppreference.com/w/cpp/language/../utility/program/../optional/deduction_guides.html below:

deduction guides for std::optional - cppreference.com

#include <optional>
#include <type_traits>
 
int main()
{
    int a[2];
    std::optional oa{a}; // uses explicit deduction guide
    static_assert(std::is_same_v<decltype(oa), std::optional<int*>> == true);
}

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