Question

I get this message when trying to insert an object to a table (struct) that holds an array of a struct type ObjectLink. The structs:

typedef struct ObjectLink {
    void *key;
    struct Object *next;
} ObjectLink;

typedef struct Object {
    void *key;
    ObjectLink *top;
} Object;

typedef struct Table{
    ObjectLink *linkedObjects;
    int size, originalSize;
    HashFcn hfun;
    PrintFcn pfun;
    ComparisonFcn fcomp;
} Table;

The code that is failing (on all assignments & if statement):

Boolean InsertObject(TableP table, ObjectP object)
{

    int i = table->hfun(object, table->size);
    if (table->linkedObjects[i]->key == NULL)
    {
        table->linkedObjects[i]->key = object;
    } else
    {
        table->linkedObjects[i]->next->key = object;
    }

    return TRUE;
}

I’ve searched in previous questions but that didn’t help. What is wrong here?

Answer 1

Since linkedObjects is a pointer, linkedObjects[i] is the object itself. The -> operator works only on pointers; when you have a struct, you need to use the regular dot operator . for field access:

table->linkedObjects[i].key = object;
//                     ^--- Here