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#include <iostream>
 
struct s
{
    int i;
 
        s(int j)
                : i(j)
        { }
 
};
 
 
std::ostream& operator<<(std::ostream& outputstream, s& arr)
{
        outputstream << arr.i << "\n";
        return outputstream;
}
 
s operator+(const s& a, const s& b)
{
    return s(a.i + b.i);
}
 
int main()
{
    s m(1);
    s n(2);
 
    std::cout << (m + n);
    return 0;
}
 

prog.cpp: In function 'int main()':
prog.cpp:30:24: error: cannot bind 'std::ostream' lvalue to 'std::basic_ostream<char>&&'
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/ostream:579:5: error:   initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char, _Traits = std::char_traits<char>, _Tp = s]'

Standard output is empty