Thread: Simple struct definition error

You can't use Console * inside the structure that defines Console in the first place. You need to typedef it first.


Quzah.

like...

Code:

typedef Console* ConsoleRef;

typedef struct
{ 
  //console properties
  int Number;
  void (*Hide)(ConsoleRef);
  void (*Show)(ConsoleRef);
  short x;
  short y;
  short width;
  short height;
} Console;

How exactly did you mean?

Originally Posted by hotwheelharry

like...

Code:

typedef Console* ConsoleRef;

typedef struct
{ 
  //console properties
  int Number;
  void (*Hide)(ConsoleRef);
  void (*Show)(ConsoleRef);
  short x;
  short y;
  short width;
  short height;
} Console;

How exactly did you mean?

You're doing a typedef of struct "nothing" to console.
And the first typedef doesn't work.
An example that works:

Code:

#include <stdio.h>

struct console;
typedef struct console *console_ptr;

typedef struct console {
	int a;
	console_ptr c_p;
} console;

int main(void)
{
	console c = {.a = 0, .c_p = NULL,};
	printf("c.a = %d\n", c.a);
	return 0;
}

Also those are not references, which don't even exist in c, but pointers.

Please don't typedef pointers like this. They obfuscate the code!
Is it really that difficult to type out the * to make it a pointer type?

Originally Posted by MisterIO

IMO there's no point in doing the typedef of struct console either, unless he wants to create an opaque type(which wouldn't make it necessary, but sometimes it's used).

Gotta disagree with that if you mean that of these two:

Code:

typdef struct console;
struct console;

you prefer the later. But I do agree with Elysia about not including a * in typedef's.