Oh okay, thanks for the very speedy reply.
Unfortunately that doesn't completely solve my problem. To expand on the exercise I have a function with a signature like this:
Code:
int array2d_create(Array2D *array, int columns, int rows)
This method basically uses malloc() and calloc() to allocate memory for the array object, and returns a pointer to the array through the "array" parameter. I then have functions later on for manipulating the array, such as:
Code:
int array2d_get(Array2D *array, int column, int row)
and
Code:
int array2d_set(Array2D *array, int column, int row, int value)
In each of these functions I want to test if the pointer "array" is actually pointing to an "Array2D" object, and return an error code if it isn't.
Since there is no guarantee that the user of the functions (which are being used in a basic library) will initialise the pointer to NULL when it is created, how could I test if the pointer has been initialised to point to a structure before it is used?
Thanks again