How do I merge two containers efficiently with std::unordered_map in multithreaded code?

Merging two containers in C++ using std::unordered_map can be efficiently accomplished in a multithreaded environment. This example demonstrates how to safely merge two unordered maps from different threads while ensuring thread safety.

std::unordered_map, multithreading, C++, container merging, thread-safe operations

This example shows an efficient way to merge two std::unordered_map containers in C++ using multithreading. It highlights the importance of using proper synchronization mechanisms to avoid data races.


        #include 
        #include 
        #include 
        #include 
        #include 

        std::unordered_map map1;
        std::unordered_map map2;
        std::unordered_map mergedMap;
        std::shared_mutex mergeMutex;

        void fillMap1() {
            for (int i = 0; i < 10; ++i) {
                map1[i] = "Value " + std::to_string(i);
            }
        }

        void fillMap2() {
            for (int i = 5; i < 15; ++i) {
                map2[i] = "Value " + std::to_string(i);
            }
        }

        void mergeMaps() {
            std::unique_lock<:shared_mutex> lock(mergeMutex);
            mergedMap.insert(map1.begin(), map1.end());
            mergedMap.insert(map2.begin(), map2.end());
        }

        int main() {
            std::thread t1(fillMap1);
            std::thread t2(fillMap2);

            t1.join();
            t2.join();

            mergeMaps();

            for (const auto& pair : mergedMap) {
                std::cout << pair.first << ": " << pair.second << std::endl;
            }

            return 0;
        }

How do I merge two containers efficiently with std::unordered_map in multithreaded code?

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How do I merge two containers efficiently with std::unordered_map in multithreaded code?

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