--- /dev/null
+#ifndef _FANCY_CMP_H
+#define _FANCY_CMP_H
+
+struct cmp_info {
+ unsigned xcode;
+ int offset;
+};
+
+struct item {
+ unsigned value;
+ char *str;
+};
+
+static inline int fancy_cmp(const struct item *a, const struct item *b,
+ struct cmp_info *ctx)
+{
+ unsigned vala = a->value ^ ctx->xcode;
+ unsigned valb = b->value ^ ctx->xcode;
+ const char *stra, *strb;
+
+ if (vala < valb)
+ return -1;
+ else if (valb < vala)
+ return 1;
+
+ stra = a->str + ctx->offset;
+ strb = b->str + ctx->offset;
+
+ return strcmp(stra, strb);
+}
+
+static inline int fancy_cmp_noctx(const void *av, const void *bv)
+{
+ const struct item *a = (const struct item *)av;
+ const struct item *b = (const struct item *)bv;
+ struct cmp_info ctx_default = {
+ .xcode = 0x1234,
+ .offset = 3,
+ };
+ total_order(default_order, struct item, struct cmp_info *) = {
+ fancy_cmp, &ctx_default,
+ };
+
+ return default_order.cb(a, b, default_order.ctx);
+}
+
+#endif /* _FANCY_CMP_H */