Pointer assignment not working while debugging

Question

I have a struct that contains two pointers, < head, iterator > both pointers point to another struct - Node.

typedef struct Map_t {

    Node head;
    Node iterator;

} Map_t;

typedef struct Node_t* Node;

struct Node_t {
    MapDataElement Data;
    MapKeyElement Key;

    struct Node_t *next;
};

typedef struct Map_t *Map;

I want to make the iterator pointer point to the same position as head. heres Debbuging before and after runnning the line:

Before line

After line

As you can see, after running the line, the map->iterator still points to 0x0.. Why is that?

Answer 1

It appears that the pointer assignment has occurred as evidenced by your second picture, which highlights the changes to the members of map->iterator. I'd imagine the method runs to completion, returning the pointer 0x9918f0.

This leads me to believe that you're not actually experiencing a failure in pointer assignment, but merely a failure in your debugger (Eclipse) displaying an updated value. This could be due to a bug in Eclipse or it could be due to insufficient debugging information available to Eclipse. It is difficult to say with only the example given.