How do I reserve capacity ahead of time with std::set in multithreaded code?

C++, std::set, reserve capacity, multithreaded code, performance optimization
Learn how to effectively manage capacity in std::set with multithreaded code, ensuring optimal performance and efficiency.
// Note: std::set does not provide a direct way to reserve capacity like vectors do, // but you can create a set of a specific size using a custom allocator. #include #include #include #include std::mutex mtx; // Mutex for thread safety void insertIntoSet(std::set& mySet, int value) { std::lock_guard<:mutex> lock(mtx); // Lock the mutex for thread safety mySet.insert(value); // Insert into the set } int main() { std::set mySet; // Launch multiple threads to insert values into the set std::thread t1(insertIntoSet, std::ref(mySet), 1); std::thread t2(insertIntoSet, std::ref(mySet), 2); std::thread t3(insertIntoSet, std::ref(mySet), 3); t1.join(); t2.join(); t3.join(); // Output the values in the set for (const auto& value : mySet) { std::cout << value << " "; } std::cout << std::endl; return 0; }

C++ std::set reserve capacity multithreaded code performance optimization

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