Question

i have helper C functions in some Objective C classes.
Just found out that the values of global, static C variables which i use in these functions are shared between instances of the class (duh), which is not what i want.

Is there a way to declare these variables local to instances of the class, so that they are visible by the helper functions without passing them explicitly?

Answer 1

Is there a way to declare these variables local to instances of the class

Sure, make them instance variables.

But:

so that they are visible by the helper functions without passing them explicitly?

You can pass the object into the function. If you have appropriate accessors, the function can get them. And if you have mutators, it can modify them, too.

But if you’re doing that, you might as well just create a method, and automatically have access to the instance variables.