reftable/pq.h

   1 /*
   2 Copyright 2020 Google LLC
   3
   4 Use of this source code is governed by a BSD-style
   5 license that can be found in the LICENSE file or at
   6 https://developers.google.com/open-source/licenses/bsd
   7 */
   8
   9 #ifndef PQ_H
  10 #define PQ_H
  11
  12 #include "record.h"
  13
  14 struct pq_entry {
  15         size_t index;
  16         struct reftable_record *rec;
  17 };
  18
  19 struct merged_iter_pqueue {
  20         struct pq_entry *heap;
  21         size_t len;
  22         size_t cap;
  23 };
  24
  25 struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq);
  26 int merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e);
  27 void merged_iter_pqueue_release(struct merged_iter_pqueue *pq);
  28 int pq_less(struct pq_entry *a, struct pq_entry *b);
  29
  30 static inline struct pq_entry merged_iter_pqueue_top(struct merged_iter_pqueue pq)
  31 {
  32         return pq.heap[0];
  33 }
  34
  35 static inline int merged_iter_pqueue_is_empty(struct merged_iter_pqueue pq)
  36 {
  37         return pq.len == 0;
  38 }
  39
  40 #endif