Self referencing structure

[Bladactania]

I have a structure that contains a pointer to another instance of itself (like a linked list). However I'm getting an error that says I'm missing a ";" when I'm not...

typedef struct IOD {
  char Name[11];
  int  Request_Type;
  char *Transfer_Buffer;
  int  *Transfer_Counter;
  IOD  *Next_IOD;
} IOD;

I think I need some sort of prototype struct but I'm unsure how to do this.

[laserlight]

The problem is that the typedef name IOD only exists after the struct definition.

Option #1:

typedef struct IOD IOD;

struct IOD {
  char Name[11];
  int  Request_Type;
  char *Transfer_Buffer;
  int  *Transfer_Counter;
  IOD  *Next_IOD;
};

Option #2:

typedef struct IOD {
  char Name[11];
  int  Request_Type;
  char *Transfer_Buffer;
  int  *Transfer_Counter;
  struct IOD  *Next_IOD;
} IOD;

[Bladactania]

I have a function that expects a int * as a parameter. I have an int inside a structure.

typedef struct myStruct {
  int myStructInt;
} myStruct;


myStruct test_struct;


void test_fun(int * myInt) {
  // yadda yadda
}

int main() {
  test_fun(??????????);
}

How do I pass the address of the structure element? I tried &(test_struct.myStructInt).

[laserlight]

How do I pass the address of the structure element? I tried &(test_struct.myStructInt).

That should work, though it can be simplified to &test_struct.myStructInt.

[quzah]

No, that's completely wrong now. The structure doesn't contain a pointer to a structure any more. You took it out and declared a type. Go back and read laserlight's post again.


Quzah.