I can globally overload unary and - operators like this:
#include <cstdint>
enum local_states_t
{
LOCAL_STATE_A = 1,
LOCAL_STATE_B,
LOCAL_STATE_LIMIT,
};
typedef uint32_t state_type_t;
state_type_t operator-(local_states_t state) { return static_cast<state_type_t>(state | (1<<31)); }
Can I do the same for prefix /--? The problem here of course is how would the compiler know that it only needs to call these functions for local_state_t - types? Prefix operators don't have a dummy value..
CodePudding user response:
(From the comments)
Yes - you can define local_states_t& operator (local_states_t &)
. Unlike classes, enums can't have members, so you need a free function.
You can also define it to return state_type_t
, which is unusual but allowed.