How do I handle errors with iterators in C++ std::map?

What are common errors when using iterators with std::map in C++?

Common errors include dereferencing invalid iterators, using end() iterator incorrectly, and modifying the map while iterating.

How can I safely iterate over a std::map without running into these errors?

You can use a for loop with iterators and check for the end condition before dereferencing. Avoid modifying the map during iteration.

What happens if I try to erase an element while iterating?

Erasing an element invalidates the iterator pointing to that element. Use the iterator returned by erase() to continue safely.

Can you give an example of safe iteration with std::map?

Sure! Here's a simple example:

std::map<int, std::string> myMap = {{1, "one"}, {2, "two"}, {3, "three"}};
for (auto it = myMap.begin(); it != myMap.end(); ) {
    if (it->first == 2) {
        it = myMap.erase(it); // erase returns the next iterator
    } else {
        ++it;
    }
}