How do I provide stable iteration order with std::deque in performance-sensitive code?

In performance-sensitive code, ensuring a stable iteration order when using `std::deque` is crucial. Although `std::deque` provides fast insertion and deletion at both ends, the order of iteration can be influenced by the underlying implementation. Therefore, it's essential to maintain the order of elements explicitly if your application relies on it.

One common strategy is to use a vector to encapsulate the iteration, making sure that you convert your `std::deque` to a `std::vector` before iteration, as vectors guarantee stable iteration order.


    // Example of maintaining stable iteration order with std::deque
    #include 
    #include 
    #include 
    
    int main() {
        std::deque dq = {1, 2, 3, 4, 5};
        
        // Convert to vector for stable iteration
        std::vector vec(dq.begin(), dq.end());
        
        // Iterate over the vector
        for (int value : vec) {
            std::cout << value << " ";
        }
        
        return 0;
    }

How do I provide stable iteration order with std::deque in performance-sensitive code?

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How do I provide stable iteration order with std::deque in performance-sensitive code?

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