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The ::value_type of the std::map/std::multimap/std::unordered_map containers is std::pair<const Key, T>. Dropping the const results in an unnecessary copy, for example in C++11 range-based loops. For this I started with a more general scripted diff, then narrowed it down based on the inspection showing that all actual map/multimap/unordered_map variables used in loops start with m or have map in the name. -BEGIN VERIFY SCRIPT- sed -i -E 's/for \(([^<]*)std::pair<([^c])(.+) : m/for (\1std::pair<const \2\3 : m/' src/*.cpp src/**/*.cpp sed -i -E 's/for \(([^<]*)std::pair<([^c])(.+) : (.*)map/for (\1std::pair<const \2\3 : \4map/' src/*.cpp src/**/*.cpp -END VERIFY SCRIPT-