James wrote:
> Ok, this is an easy question...but it's annoying me,
>
> How do i pass by reference? i want to pass a pointer to a struct into a
> function, have the function modify the pointer to point somewhere else, and
> pass back the new pointer:
>
> mystruct *pointer, *head;
>
> void Modify (mystruct *input)
> {
> Modify_the_pointer; /* i'm dealing with a linked list, so lets say i
> want it to point to the next
>one and return
> the address of that element */
> input = new_location_in_list;
> }
>
> void main (void)
> {
> malloc head;
>
> assign some data;
> make pointer point to head
> modify (pointer)
> /* pointer now wants to point to next one */
> }
You have to pass a pointer, e.g.
void Modify (mystruct **input)
{
Modify_the_pointer;
*input = new_location_in_list;
}
void main (void)
{
malloc head;
assign some data;
make pointer point to head
modify(&pointer);
/* pointer now wants to point to next one */
}
> i've tried doing that but get errors about passing incompatible pointer
> types and making pointers from integers without casting.
The cast errors are unrelated to issues of passing by reference.
--
Glynn Clements <[EMAIL PROTECTED]>
