How do I serialize and deserialize contents with std::set for large datasets?

In C++, serializing and deserializing `std::set` can be a crucial requirement when handling large datasets. This process allows for the easy storage and retrieval of data in a format that can be sent over a network or saved to a file. Here, we provide an example demonstrating how to achieve this using the C++ standard library.

#include <iostream>
#include <set>
#include <fstream>

// Function to serialize a set to a file
void serializeSet(const std::set<int>& s, const std::string& filename) {
    std::ofstream ofs(filename);
    for (const auto& item : s) {
        ofs << item << std::endl;
    }
}

// Function to deserialize a set from a file
std::set<int> deserializeSet(const std::string& filename) {
    std::set<int> s;
    std::ifstream ifs(filename);
    int item;
    while (ifs >> item) {
        s.insert(item);
    }
    return s;
}

int main() {
    std::set<int> originalSet = {1, 2, 3, 4, 5};
    std::string filename = "set_data.txt";

    // Serialize the set
    serializeSet(originalSet, filename);

    // Deserialize the set
    std::set<int> newSet = deserializeSet(filename);

    // Output the contents of the new set
    for (const auto& item : newSet) {
        std::cout << item << " ";
    }

    return 0;
}