View Compilation Error

0_0_18622435_12011.cpp:77:30: error: 'Mat' does not name a type
     Matrix operator - (const Mat
                              ^
0_0_18622435_12011.cpp:77:30: error: expected ',' or '...' at end of input
0_0_18622435_12011.cpp:77:30: error: expected ')' at end of input
0_0_18622435_12011.cpp:77:30: error: expected ';' at end of member declaration
0_0_18622435_12011.cpp:77:30: error: expected '}' at end of input
0_0_18622435_12011.cpp:76:5: error: expected unqualified-id at end of input
     }
     ^