How do I iterate safely under modification with std::deque for embedded targets?

Iterating over a `std::deque` in C++ while modifying it can be tricky, especially in embedded systems where stability and performance are critical. It's important to ensure that iterators remain valid throughout the modification process. Here’s how to safely iterate a `std::deque` when you're also modifying it.

One effective method is to use a traditional for-loop and adjust your index accordingly to account for the changes in the container size. This way, you can avoid invalidating iterators:


    #include <iostream>
    #include <deque>

    int main() {
        std::deque<int> myDeque = {1, 2, 3, 4, 5};

        for (size_t i = 0; i < myDeque.size(); ) {
            std::cout << myDeque[i] << std::endl;

            if (myDeque[i] % 2 == 0) {  // For example, remove even numbers
                myDeque.erase(myDeque.begin() + i);
            } else {
                ++i;  // Only increment if you do not modify the deque
            }
        }

        return 0;
    }

How do I iterate safely under modification with std::deque for embedded targets?

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How do I iterate safely under modification with std::deque for embedded targets?

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