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Mission Impossible / How to create datatypes which cannot contain invalid state

adrianimboden
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For details, see: https://en.cppreference.com/w/cpp/utility/optional

std::optional
#include <iostream>
#include <optional>
void print_value(std::optional<int> optional_value) {
if (optional_value) {
std::cout << optional_value.value() << "\n";
} else {
std::cout << "n/a\n";
}
}
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