How do I iterate safely under modification with std::vector for large datasets?

When dealing with large datasets in C++, especially when using `std::vector`, it is crucial to iterate safely while modifying the collection. One common approach is to use iterators or indices carefully to ensure that the modifications do not invalidate the state of the iteration.

Here’s an example demonstrating how to safely iterate over a `std::vector` while modifying it:


        // Example C++ code
        #include 
        #include 
        
        void modifyVector(std::vector& vec) {
            for (size_t i = 0; i < vec.size(); ) {
                if (vec[i] % 2 == 0) { // If the element is even, remove it
                    vec.erase(vec.begin() + i); // Removes element
                } else {
                    ++i; // Move to the next element only if we didn't erase
                }
            }
        }
        
        int main() {
            std::vector numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
            modifyVector(numbers);
            
            for (const auto& num : numbers) {
                std::cout << num << " ";
            }
            return 0;
        }

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How do I iterate safely under modification with std::vector for large datasets?

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How do I iterate safely under modification with std::vector for large datasets?

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