Re: compteur ?

Petite implémentation sans compteur, pour le fun:

#include <stdio.h>
#include <stdint.h>
#include <assert.h>
typedef uint64_t fifo_t;
#define FIFO_CAPACITY (sizeof(fifo_t))
static inline void fifo_init(fifo_t *f) {
 *f = 0;
}
static inline int fifo_is_empty(fifo_t *f) {
 return ((*f) == 0);
}
static inline void fifo_push(fifo_t *f, char val) {
 *f <<= 8;
 *f |= (0x80 | val);
}
static inline char fifo_read(fifo_t *f) {
 char res;
 while ((*f & (0x80UL << (8 * (FIFO_CAPACITY - 1)))) == 0)
 *f <<= 8;
 res = (*f & (0x7fUL << (8 * (FIFO_CAPACITY - 1)))) >> (8 * (FIFO_CAPACITY - 1));
 *f <<= 8;
 return res;
}
int main(int ac, char **av) {
 const char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
 fifo_t fifo;
 int i;
 fifo_init(&fifo);
 assert(fifo_is_empty(&fifo));
 for (i = 0; i < FIFO_CAPACITY; i++)
 fifo_push(&fifo, alphabet[i]);
 while (!fifo_is_empty(&fifo))
 printf("Read: %c\n", fifo_read(&fifo));
 assert(fifo_is_empty(&fifo));
 fifo_push(&fifo, 'z');
 assert(fifo_read(&fifo) == 'z');
 return 0;
}