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

Iterating through a std::map while it's under modification can lead to unexpected behavior or crashes. To safely iterate and modify a std::map, particularly in embedded targets where resources are limited, you can utilize various strategies: creating a copy of the keys, using an iterator to track changes, or locking mechanisms if multithreading is involved.

Here's an example of safely iterating through a std::map by creating a copy of its keys:

std::map myMap = {{1, "one"}, {2, "two"}, {3, "three"}}; std::vector keys; // Collect keys for (const auto& pair : myMap) { keys.push_back(pair.first); } // Iterate through the map using the copied keys for (int key : keys) { std::cout << key << ": " << myMap[key] << std::endl; // Safely modify the map if (key == 2) { myMap[key] = "modified two"; } }

Safe Iteration std::map C++ embedded targets modification iterate safely

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