Is there any workaround for making a structure member somehow 'private' in C?

Question

I am developing a simple library in C, for my own + some friends personal use.

I am currently having a C structure with some members that should be somehow hidden fr

Answer 1

I agree with Marcelo Cantos, but also suggest simply adding a pointer inside the "public" structure, which points to the "private" contents, i.e:

/* foo.h */
typedef struct Bar Bar;
typedef struct Foo 
{
   int public;
   Bar* private;
} Foo;

Foo *foo_create(...);

void foo_bark(Foo* foo, double loudness);

/* foo.c */
struct Bar 
{
  int private_var;
};

This approach is kind of like the "pimpl" ideom. The simplest approach by far is to do what Marcelo Cantos suggested.