How do I avoid iterator invalidation with std::span?

When working with C++ Standard Library containers, iterator invalidation can be a significant concern. However, using `std::span` can help you manage a lightweight view over a contiguous sequence without the risk of iterator invalidation that you would face with some collections. This is particularly useful when you need to provide a view over an array or a vector without modifying the underlying storage.

Here's how you can avoid iterator invalidation using `std::span`:


        #include 
        #include 
        #include 

        void processSpan(std::span spans) {
            for (int element : spans) {
                std::cout << element << " ";
            }
            std::cout << std::endl;
        }

        int main() {
            std::vector vec = {1, 2, 3, 4, 5};
            std::span spn(vec.data(), vec.size()); // Create a span

            processSpan(spn); // Pass the span to a function

            // Even if we modify the original vector later, the span itself remains valid
            vec.push_back(6);
            // Note: We'd need to create a new span if we want to include the new element
            std::span newSpn(vec.data(), vec.size()); 
            processSpan(newSpn);

            return 0;
        }

How do I avoid iterator invalidation with std::span?

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How do I avoid iterator invalidation with std::span?

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