How do I erase elements while iterating with std::set in multithreaded code?

In C++, when working with a `std::set` in a multithreaded environment, it is crucial to ensure thread safety. Unlike other containers, `std::set` provides an ordered collection of unique elements, but directly modifying it while iterating can lead to undefined behavior. To safely erase elements from a `std::set` while iterating, you can use an iterator that allows for safe modifications.

This example demonstrates how to remove elements from a `std::set` while iterating over it, using access to mutexes to manage thread safety properly.


        // Example code for erasing elements from std::set in a multithreaded context
        #include 
        #include 
        #include 
        #include 

        std::set mySet = {1, 2, 3, 4, 5};
        std::mutex mtx;

        void eraseElements(int valueToErase) {
            std::lock_guard<:mutex> lock(mtx);
            for (auto it = mySet.begin(); it != mySet.end(); ) {
                if (*it == valueToErase) {
                    it = mySet.erase(it); // Erase and move to the next valid iterator
                } else {
                    ++it; // Move to the next element
                }
            }
        }

        int main() {
            std::thread t1(eraseElements, 3);
            std::thread t2(eraseElements, 5);

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

            for (int num : mySet) {
                std::cout << num << " ";
            }
            return 0;
        }

How do I erase elements while iterating with std::set in multithreaded code?

Popular Topics

Recent Languages

How do I erase elements while iterating with std::set in multithreaded code?

Related Questions

Popular Topics

Recent Languages