A manipulator that allows you to specify how many new lines you want written to the output stream at one time.

gistfile1.cpp

#include <iostream>

class endl_n_manipulator
{
public:
    endl_n_manipulator(int count) : count(count) { }

    friend std::ostream& operator<<(std::ostream& os, const endl_n_manipulator& manip)
    {
        std::ostream::sentry s(os);
        std::ios_base::iostate err = std::ios_base::goodbit;

        if (s)
        {
            try
            {
                std::ostreambuf_iterator<char> out(os);
                std::fill_n(out, manip.count, '\n');

                if (out.failed())
                    os.setstate(std::ios_base::badbit);
            } catch (...) { os.setstate(std::ios_base::badbit); }
        } else
            err |= std::ios_base::failbit;

        if (err)
            os.setstate(err);

        return os;
    }
private:
    int count;
};

endl_n_manipulator endl_n(int count)
{
    return endl_n_manipulator(count);
}

int main()
{
    std::cout << "Hello" << endl_n(3) << "World";
}