How do I erase elements while iterating with std::map for embedded targets?

When working with `std::map` in C++, you may find yourself needing to erase elements while iterating through the map. This is a common requirement, especially in embedded systems where memory management is crucial. However, iterating directly with an iterator while modifying the map can lead to undefined behavior. To safely erase elements, it's essential to use the iterator returned by the `erase` method or to store the next iterator before erasing the current element.

The following example demonstrates how to safely erase elements from a `std::map`:


        #include 
        #include 

        int main() {
            std::map myMap;

            // Inserting elements into the map
            myMap[1] = "One";
            myMap[2] = "Two";
            myMap[3] = "Three";

            // Iterating and erasing elements
            for (auto it = myMap.begin(); it != myMap.end(); ) {
                if (it->first % 2 == 0) { // Let's say we want to erase even keys
                    it = myMap.erase(it); // Erase returns the next iterator
                } else {
                    ++it; // Increment only if no erase occurred
                }
            }

            // Output remaining elements
            for (const auto& pair : myMap) {
                std::cout << pair.first << ": " << pair.second << std::endl;
            }

            return 0;
        }

C++ std::map erase iterating embedded systems memory management C++ example

How do I erase elements while iterating with std::map for embedded targets?

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How do I erase elements while iterating with std::map for embedded targets?

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