Compilare: user.cpp: In function ‘void copy(int*, int*)’: user.cpp:61:24: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] std::memcpy(a,b,sizeof(a)); ^