ds_stack_size(id);
| Argument | Description | 
|---|---|
| id | The id of the data structure to check. | 
Returns: Real
This function will return the "size" of the stack, ie: the number of items that have been pushed onto it.
if !ds_stack_empty(control_stack)
   {
   num = ds_stack_size(control_stack);
   }
The above code checks a ds_stack to see if it is empty or not, and if it is not, it gets the number of items that it contains and stores the value in a variable.