How do I sort and stable_sort elements with std::unordered_set?

In C++, you cannot directly sort or perform a stable sort on the elements of a std::unordered_set> because it is an unordered container by design. However, you can transfer the elements to an ordered container like std::vector, sort that, and then, if necessary, move the elements back to an unordered set.

Here is an example illustrating how to sort elements that you would retrieve from a std::unordered_set:


        #include <iostream>
        #include <unordered_set>
        #include <vector>
        #include <algorithm>

        int main() {
            std::unordered_set<int> mySet = {4, 1, 3, 2};

            // Transfer elements to a vector
            std::vector<int> myVector(mySet.begin(), mySet.end());

            // Sort the vector
            std::sort(myVector.begin(), myVector.end());

            // Display sorted elements
            std::cout << "Sorted elements: ";
            for (int num : myVector) {
                std::cout << num << " ";
            }
            std::cout << std::endl;

            return 0;
        }

C++ unordered_set sort stable_sort standard library container

How do I sort and stable_sort elements with std::unordered_set?

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How do I sort and stable_sort elements with std::unordered_set?

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