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std::optional cppreference.com
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std::optional

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std::optional
 
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template<class T> optional(T) -> optional<T>;
 ( C++17)

std::optional , , , . 

#include <optional>
#include <type_traits>

int main()
{
    int a[2];
    std::optional oa{a}; //    
    static_assert(std::is_same_v<decltype(oa), std::optional<int*>> == true);
}
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