0_0_6880042_27079.cpp: In function `tt fun(int)': 0_0_6880042_27079.cpp:28: error: no match for 'operator*' in 'operator*(((tt&)(&k)), ((tt&)(&k))) * kk' 0_0_6880042_27079.cpp:9: note: candidates are: tt operator*(tt&, tt&)