1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#define NONSTD_IMPLEMENTATION
#include "../nonstd.h"
#include <stdio.h>
typedef struct {
int id;
char *name;
} User;
int main(void) {
// Initialize the arena
Arena a = arena_make();
// Allocate some structs
User *u1 = arena_alloc(&a, sizeof(User));
u1->id = 1;
// Use string builder for name, but we can't easily alloc string builder
// internal buffer on arena yet unless we make a custom allocator for it.
// For now, let's just use arena_alloc for a string.
char *name1 = arena_alloc(&a, 10);
strcpy(name1, "Alice");
u1->name = name1;
User *u2 = arena_alloc(&a, sizeof(User));
u2->id = 2;
char *name2 = arena_alloc(&a, 10);
strcpy(name2, "Bob");
u2->name = name2;
printf("User 1: %d, %s\n", u1->id, u1->name);
printf("User 2: %d, %s\n", u2->id, u2->name);
// Creating a linked list using arena
struct Node {
int val;
struct Node *next;
};
struct Node *head = NULL;
for (int i = 0; i < 5; i++) {
struct Node *node = arena_alloc(&a, sizeof(struct Node));
node->val = i;
node->next = head;
head = node;
}
printf("List: ");
for (struct Node *n = head; n; n = n->next) {
printf("%d ", n->val);
}
printf("\n");
// Free everything at once
arena_free(&a);
printf("Arena freed.\n");
return 0;
}
|
