Question

If I have a struct such as:

typedef struct bag {
  int test;
} *bag;

Then if a function consumes bag. Let’s say:

int sample(bag *b) {
    b->test ...
}

I get the error that I made a request for member ‘b’ in something that is not a structure or union. How do I fix this? I could cast b to a (struct bag *) but that seems unreasonable.

Answer 1

You just defined the type bag to be a pointer to the type struct bag. Thus, when you make a variable of type bag *b, you are effectively creating a variable of type struct bag**. Either change your argument to be bag b, or do a double dereference for your member ((*b)->test).

Edit
As another poster mentioned, you probably meant typedef struct bag { ... } bag, then your original code will compile.