Compilare: user.cpp: In destructor ‘Drive::~Drive()’: user.cpp:74:13: warning: left operand of comma operator has no effect [-Wunused-value] delete (N, M, choice, x, y); ^ user.cpp:74:16: warning: right operand of comma operator has no effect [-Wunused-value] delete (N, M, choice, x, y); ^ user.cpp:74:19: warning: right operand of comma operator has no effect [-Wunused-value] delete (N, M, choice, x, y); ^~~~~~ user.cpp:74:27: warning: right operand of comma operator has no effect [-Wunused-value] delete (N, M, choice, x, y); ^