git.ozlabs.org Git - ccan/blob - ccan/order/order.h

   1 /* CC0 license (public domain) - see LICENSE file for details */
   2 #ifndef CCAN_ORDER_H
   3 #define CCAN_ORDER_H
   4
   5 #include <stdint.h>
   6 #include <assert.h>
   7
   8 #include <ccan/typesafe_cb/typesafe_cb.h>
   9
  10 typedef int (*_total_order_cb)(const void *, const void *, void *);
  11 typedef int (*total_order_noctx_cb)(const void *, const void *);
  12
  13 #define total_order_cb(_name, _item, _ctx)              \
  14         int (*_name)(const __typeof__(_item) *,         \
  15                      const __typeof__(_item) *,         \
  16                      __typeof__(_ctx))
  17
  18 #define total_order_cast(cmp, item, ctx)                                \
  19         typesafe_cb_cast(_total_order_cb, total_order_cb(, item, ctx),  \
  20                          (cmp))
  21
  22 struct _total_order {
  23         _total_order_cb cb;
  24         void *ctx;
  25 };
  26
  27 #define total_order(_name, _item, _ctx)                 \
  28         struct {                                        \
  29                 total_order_cb(cb, _item, _ctx);        \
  30                 _ctx ctx;                               \
  31         } _name
  32
  33 #endif /* CCAN_ORDER_H */