How do I merge two containers efficiently with std::deque for embedded targets?

Merging two containers effectively is a common task in C++. When working with embedded targets where performance and memory management are crucial, using `std::deque` can be a good choice. Below is an example of how to merge two `std::deque` containers efficiently.


        #include 
        #include 

        int main() {
            // Initialize two deques
            std::deque deque1 = {1, 2, 3};
            std::deque deque2 = {4, 5, 6};

            // Merge deque2 into deque1
            deque1.insert(deque1.end(), deque2.begin(), deque2.end());

            // Display the merged deque
            for (const auto& elem : deque1) {
                std::cout << elem << " ";
            }
            return 0;
        }