what is the return type of typeof?

Question

I want to provide the type of an element as parameter to an initialization of an array of pointers to element of an unknown types

something like

void* init(type t)
  void* array = malloc(sizeof_type(t)*10));
  return array;
}

and later call for example

   init(typeof(int))

But I was not able to figure what is the return type of typeof.

I guess the sizeof_type think can be achieved using

   malloc((type) 0);

Thanks in advance

PS: this if for a vector implementatin if someone can point me to some flexiblecode i would be very thankful as well

Answer 1

I don't usually use gnu (I think it is only in gnu C), but I don't think it's an expression in the normal sense that you can assign its value to a variable and later use it. I think it can only be used in very specific contexts as a type.

From the docs:

The syntax of using of this keyword looks like sizeof, but the construct acts semantically like a type name defined with typedef.

A typeof-construct can be used anywhere a typedef name could be used. For example, you can use it in a declaration, in a cast, or inside of sizeof or typeof.