View Compilation Error

0_0_2947858_5601.cpp: In function `void min_rec(polygon&)':
0_0_2947858_5601.cpp:163: error: invalid initialization of non-const reference of type 'point&' from a temporary of type 'point'
0_0_2947858_5601.cpp:43: error: in passing argument 1 of `point RotateCW90(point&)'
0_0_2947858_5601.cpp:164: error: invalid initialization of non-const reference of type 'point&' from a temporary of type 'point'
0_0_2947858_5601.cpp:43: error: in passing argument 1 of `point RotateCW90(point&)'