View Compilation Error

0_0_17663012_32030.cpp:13:35: error: 'Mat operator*(Mat, Mat, int)' must take either one or two arguments
 Mat operator* (Mat a, Mat b, int t){
                                   ^
0_0_17663012_32030.cpp: In function 'Mat operator^(Mat, int)':
0_0_17663012_32030.cpp:33:25: error: no match for 'operator*' (operand types are 'Mat' and 'Mat')
         if(m & 1) c = c * a;
                         ^
0_0_17663012_32030.cpp:34:15: error: no match for 'operator*' (operand types are 'Mat' and 'Mat')
         a = a * a;
               ^