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basic/prioq: add prioq_peek_item()

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2019-01-26 12:42:46 +01:00
parent c482724aa5
commit ef21b3b5bf
3 changed files with 26 additions and 5 deletions
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src/basic/prioq.c
+3 -4
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@@ -259,15 +259,14 @@ int prioq_reshuffle(Prioq *q, void *data, unsigned *idx) {
return 1;
}
void *prioq_peek(Prioq *q) {
void *prioq_peek_by_index(Prioq *q, unsigned idx) {
if (!q)
return NULL;
if (q->n_items <= 0)
if (idx >= q->n_items)
return NULL;
return q->items[0].data;
return q->items[idx].data;
}
void *prioq_pop(Prioq *q) {
src/basic/prioq.h
+7 -1
View File
@@ -19,8 +19,14 @@ int prioq_put(Prioq *q, void *data, unsigned *idx);
int prioq_remove(Prioq *q, void *data, unsigned *idx);
int prioq_reshuffle(Prioq *q, void *data, unsigned *idx);
void *prioq_peek(Prioq *q) _pure_;
void *prioq_peek_by_index(Prioq *q, unsigned idx) _pure_;
static inline void *prioq_peek(Prioq *q) {
return prioq_peek_by_index(q, 0);
}
void *prioq_pop(Prioq *q);
#define PRIOQ_FOREACH_ITEM(q, p) \
for (unsigned _i = 0; (p = prioq_peek_by_index(q, _i)); _i++)
unsigned prioq_size(Prioq *q) _pure_;
bool prioq_isempty(Prioq *q) _pure_;