* is then a set of macros which check the type canary before calling
* the generic routines.
*
- * License: Public domain
+ * 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: CC0 (Public domain)
*
* Author: Rusty Russell <rusty@rustcorp.com.au>
*/