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std::set<int> myset; std::set<int>::iterator it; // insert some values: for (int i = 1; i<10; i++) myset.insert(i * 10); // 10 20 30 40 50 60 70 80 90 it = myset.begin(); // "it" points now to 10 auto prev = it; //"prev" points to 10 prev++; // "prev" points to 20 myset.erase(it); // "it points to myset.end()" If erase, it will point to end() no matter where it is. it = prev; // "it points to 20" it++; // "it points to 30" cout << *prev << endl; // 20 cout << *it << endl; // 30 |