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#include <stdarg.h>
struct Sample {
char tag;
double value;
int count;
};
static struct Sample shared = {'G', 0.5, 7};
void scale_sample(struct Sample *s, int k) { s->value *= k; }
struct Sample *shared_sample(void) { return &shared; }
int shared_count(void) { return shared.count; }
struct Counter {
int *target;
};
void bump(int *p) { ++*p; }
void bump_counter(struct Counter *c) { ++*c->target; }
void get_shared(struct Sample **out) { *out = &shared; }
/* Each argument after n is a struct Sample *, read back with va_arg. */
int sum_counts(int n, ...) {
va_list ap;
int total = 0;
va_start(ap, n);
for (int i = 0; i < n; ++i) total += va_arg(ap, struct Sample *)->count;
va_end(ap);
return total;
}
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