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C++ Language/Std/Stl/Algorithms/ApplyingItemByItem/ProcessingItemByItem

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If you have a function like void DoubleEach(int& x) { x *= 2; }, then you can repeatedly apply that same callable-object, once per collection item. The algorithm to do so is std::for_each(v.begin(), v.end(), DoubleEach).

Additional information about item-by-item processing (includes interactive examples)