gistfile1.c

#include <stdio.h>
#include <assert.h>
#include <inttypes.h>

struct hidden_data {
        char   * stuff;
        uint8_t  foo;
        uint16_t bar;
        uint32_t baz;
};

#define _GEN_ACCESSOR(valname)                                         \
        extern inline const typeof(((struct hidden_data *)0)->valname) \
        hidden_data_get_ ## valname(struct hidden_data * h) {          \
                assert(h != NULL);                                     \
                return h->valname;                                     \
        }

_GEN_ACCESSOR(stuff)
_GEN_ACCESSOR(foo)
_GEN_ACCESSOR(bar)
_GEN_ACCESSOR(baz)