void *pool_realloc (struct pool *, void *, size_t);
void *pool_nrealloc (struct pool *, void *, size_t n, size_t s);
void *pool_2nrealloc (struct pool *, void *, size_t *pn, size_t s);
void *pool_realloc (struct pool *, void *, size_t);
void *pool_nrealloc (struct pool *, void *, size_t n, size_t s);
void *pool_2nrealloc (struct pool *, void *, size_t *pn, size_t s);