411 REFERENCE · Wikibooks
C++ Language/ProgramFlow/Loops/LoopingOverCollection
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Any STL collection that provides iterators via begin() and end() (e.g., std::vector<int> veciVar = {0,11,22,33};) can be iterated by for (int iItem : veciVar) { body }.
Additional information about looping over a collection (includes interactive examples)