How do I provide stable iteration order with std::unordered_map in multithreaded code?

Managing stable iteration order in a `std::unordered_map` while dealing with multithreaded code can be challenging due to the inherent characteristics of unordered maps. However, by employing additional synchronization mechanisms or utilizing an alternative data structure, you can achieve stability in your iteration order across multiple threads.

C++, std::unordered_map, multithreaded, stable iteration, synchronization, data structure


        // Example of using a mutex to ensure stable iteration order with std::unordered_map
        #include 
        #include 
        #include 
        #include 
        #include 

        std::unordered_map myMap;
        std::mutex mapMutex;

        void addToMap(int key, const std::string& value) {
            std::lock_guard<:mutex> guard(mapMutex);
            myMap[key] = value;
        }

        void iterateMap() {
            std::lock_guard<:mutex> guard(mapMutex);
            for (const auto& pair : myMap) {
                std::cout << pair.first << ": " << pair.second << std::endl;
            }
        }

        int main() {
            std::vector<:thread> threads;

            // Create threads to add to the map
            for (int i = 0; i < 10; ++i) {
                threads.push_back(std::thread(addToMap, i, "value" + std::to_string(i)));
            }

            // Join threads
            for (auto& thread : threads) {
                thread.join();
            }

            // Iterating over the map
            iterateMap();

            return 0;
        }

How do I provide stable iteration order with std::unordered_map in multithreaded code?

Popular Topics

Recent Languages

How do I provide stable iteration order with std::unordered_map in multithreaded code?

Related Questions

Popular Topics

Recent Languages