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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
#include "config.h"
#include <string.h>
/**
* tcon - routines for creating typesafe generic containers
*
* This code lets users create a structure with a typecanary; your API
* is then a set of macros which check the type canary before calling
* the generic routines.
*
* Example:
* #include <ccan/tcon/tcon.h>
* #include <stdio.h>
*
* // A simple container class. Can only contain one thing though!
* struct container {
* void *contents;
* };
* static inline void container_add_raw(struct container *c, void *p)
* {
* c->contents = p;
* }
* static inline void *container_get_raw(struct container *c)
* {
* return c->contents;
* }
*
* // This lets the user define their container type; includes a
* // "type canary" to check types against.
* #define DEFINE_TYPED_CONTAINER_STRUCT(name, type) \
* struct name { struct container raw; TCON(type canary); }
*
* // These macros make sure the container type and pointer match.
* #define container_add(c, p) \
* container_add_raw(&tcon_check((c), canary, (p))->raw, (p))
* #define container_get(c) \
* tcon_cast((c), canary, container_get_raw(&(c)->raw))
*
* // Now, let's define two different containers.
* DEFINE_TYPED_CONTAINER_STRUCT(int_container, int *);
* DEFINE_TYPED_CONTAINER_STRUCT(string_container, char *);
*
* int main(int argc, char *argv[])
* {
* struct int_container ic;
* struct string_container sc;
*
* // We would get a warning if we used the wrong types...
* container_add(&ic, &argc);
* container_add(&sc, argv[argc-1]);
*
* printf("Last arg is %s of %i arguments\n",
* container_get(&sc), *container_get(&ic) - 1);
* return 0;
* }
* // Given "foo" outputs "Last arg is foo of 1 arguments"
* // Given "foo bar" outputs "Last arg is bar of 2 arguments"
*
* License: Public domain
*
* Author: Rusty Russell <rusty@rustcorp.com.au>
*/
int main(int argc, char *argv[])
{
/* Expect exactly one argument */
if (argc != 2)
return 1;
if (strcmp(argv[1], "depends") == 0) {
return 0;
}
return 1;
}
|
