2 ms·

> Sure ownership protects against more things. But some coding patterns are impossible under it. In Rust you're told that if it's impossible under ownership th

• thradams 3y ago
  It works in both ways. We can just tell the compiler to ignore some function. We can be also creative writing the code that at same time is good and makes the static analysis happy. A good sample is linked lists. #include <ownership.h> #include <stdlib.h> #include <assert.h> #include <stdio.h> #include <string.h> struct node { char * owner text; struct node* owner next; }; struct list { struct node * owner head; struct node * tail; }; void list_append(struct list* list, struct node* owner node) { if (list->head == NULL) { list->head = node; } else { assert(list->tail->next == 0); list->tail->next = node; //ZERO OVERHEAD } list->tail = node; } void list_destroy(struct list* obj_owner list) { struct node * owner p = list->head; while (p) { struct node * owner next = p->next; free(p->text); free(p); p = next; } } void list_print(const struct list* list) { const struct node * p = list->head; while (p) { printf("%s ", p->text); p = p->next; } } int main() { struct list list = {}; struct node * owner p = calloc(1, sizeof * p); if (p) { p->text = strdup("item1"); list_append(&list, p); } list_print(&list); list_destroy(&list); }