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#include <iostream>
#include <iterator>
#include <algorithm>
 
namespace std
{
struct magic { int a, b; } m = {44, 11};
inline magic & operator ++ (magic &m) { return ++m.a, ++m.b, m; }
inline double operator * (const magic &m) { return (double)m.a / m.b; }
 
template <> struct iterator_traits<magic> : iterator_traits<istream_iterator<double> > {};
 
int z = (copy_n(m, 100, ostream_iterator<double>(std::cout, "\n")), 0);
}
 
int main() {}

prog.cpp:13:66: error: 'copy_n' was not declared in this scope
 int z = (copy_n(m, 100, ostream_iterator<double>(std::cout, "\n")), 0);
                                                                  ^

Standard output is empty