Modern C++ Programming Cookbook

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These iterator adapters are intended to be used with algorithms or functions that insert multiple elements into a range. They can be used, of course, to insert a single element, but that is rather an anti-pattern, since simply calling push_back(), push_front(), or insert() is much simpler and intuitive in this case. The following examples should be avoided:

    std::vector<int> v{ 1,2,3,4,5 };    *std::back_inserter(v) = 6; // v = {1,2,3,4,5,6}    std::back_insert_iterator<std::vector<int>> it(v);    *it = 7;                    // v = {1,2,3,4,5,6,7}