Search code examples
cpointersstructdereference

Issue with dereferencing of pointers

I get an error when trying to assign a value to a pointer.

I have defined 2 structs:

typedef struct {
    struct player *next; //pointers
    struct player *prev;
} player;

typedef struct {
    player onMe; //object
} field;

later in the code, I create an instance of the struct "player p" and try to use it: fields[][] is an array that holds structs of the type field.

fields[p.x][p.y].onMe = *(p.next);
(*p.prev).next = &p.next;

in these cases i get "error: dereferencing pointer to incomplete type" I also tried (&p.next) but has the same result.

fields[x][y].onMe.prev = (&p);

in this case i get "warning: assignment from incompatible pointer type [enabled by default]"

Can someone tell me what I'm doing wrong?

Solution

  • You don't declare struct player anywhere so the definition of the struct is incomplete. Try

    typedef struct player_s {
    struct player_s *prev;
    struct player_s *next;
} player;