C取消引用指向不完整类型的指针

Question

I read many answers about this questions, and I can't see the problem here.

In dish.h I have:

typedef struct Dish_t* Dish;

and in dish.c:

struct Dish_t {
 DishKind kind;
 Taste taste;
};

but when I write in dish.c:

Dish newDish = malloc(sizeof(*newDish));

I get the dereferencing error. When I change Dish_t to Dish , it works! Why?

Answer 1

You say:

When I change Dish_t to Dish, it works! Why?

But your code actually uses Dish . It won't work with plain Dish_t , since that's not a valid type name. It must be either struct Dish_t or Dish .

I would recommend against including the asterisk in the typedef since it adds even more chances of confusion.

Answer 2

You have to do

struct Dish_t newDish=malloc(sizeof(struct Dish_t));
Dish = &newDish;