undefined C struct forward declaration

Question

I have a header file port.h, port.c, and my main.c

I get the following error: \'ports\' uses undefined struct \'port_t\'

I thought as I have declared the str

Answer 1

A common solution that I use:

/* port.h */
typedef struct port_t *port_p;

/* port.c */
#include "port.h"
struct port_t
{
    unsigned int port_id;
    char name;
};

You use the port_p in function interfaces. You will need to create special malloc (and free) wrappers in port.h as well:

port_p portAlloc(/*perhaps some initialisation args */);
portFree(port_p);