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tlist
typesafe double linked list routines
Rusty Russell <rusty@rustcorp.com.au>
The list header contains routines for manipulating double linked lists; this extends it so you can create list head types which only accomodate a specific entry type.
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <ccan/tlist/tlist.h>
// We could use TLIST_TYPE(children, struct child) to define this.
struct tlist_children {
struct list_head raw;
TCON(struct child *canary);
};
struct parent {
const char *name;
struct tlist_children children;
unsigned int num_children;
};
struct child {
const char *name;
struct list_node list;
};
int main(int argc, char *argv[])
{
struct parent p;
struct child *c;
unsigned int i;
if (argc < 2)
errx(1, "Usage: %s parent children...", argv[0]);
p.name = argv[1];
tlist_init(&p.children);
for (i = 2; i < argc; i++) {
c = malloc(sizeof(*c));
c->name = argv[i];
tlist_add(&p.children, c, list);
p.num_children++;
}
printf("%s has %u children:", p.name, p.num_children);
tlist_for_each(&p.children, c, list)
printf("%s ", c->name);
printf("\n");
return 0;
}
LGPL