Thread: Implementing opaque abstract data types?

Hello,
How do I express the following instructions
into "C" code? Pls give example.

The instructions:
Use structure pointers
additionally hidden behind typedefs;which point
to structure types, that are not publicly defined.

Thank you,

Adock.

Code:

struct datastruct
{
    int data;
};

typedef struct datastruct datastruct_s;
typedef struct datastruct *pdatastruct_s;

/* A pointer to the struct */
pdatastruct datastruct_ptr;

/* Allocate memory */
datastruct_ptr = malloc (sizeof (datastruct_s));

/* For safety check if operation was succesfull */
if (datastruct_ptr == NULL)
    return ERROR;

/* Using the member of the struct */
datastruct_ptr->data = 2;

/* Free memory when done */
free (datastruct_ptr);

This is very good. Thank you "The Homeworker".

You're a scholar, and a gentleperson.

Adock.