84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
#ifndef OIDSET_H
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#define OIDSET_H
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#include "oidmap.h"
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/**
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* This API is similar to sha1-array, in that it maintains a set of object ids
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* in a memory-efficient way. The major differences are:
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*
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* 1. It uses a hash, so we can do online duplicate removal, rather than
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* sort-and-uniq at the end. This can reduce memory footprint if you have
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* a large list of oids with many duplicates.
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*
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* 2. The per-unique-oid memory footprint is slightly higher due to hash
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* table overhead.
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*/
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/**
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* A single oidset; should be zero-initialized (or use OIDSET_INIT).
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*/
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struct oidset {
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struct oidmap map;
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};
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#define OIDSET_INIT { OIDMAP_INIT }
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static inline void oidset_init(struct oidset *set, size_t initial_size)
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{
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oidmap_init(&set->map, initial_size);
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}
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/**
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* Returns true iff `set` contains `oid`.
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*/
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int oidset_contains(const struct oidset *set, const struct object_id *oid);
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/**
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* Insert the oid into the set; a copy is made, so "oid" does not need
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* to persist after this function is called.
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*
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* Returns 1 if the oid was already in the set, 0 otherwise. This can be used
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* to perform an efficient check-and-add.
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*/
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int oidset_insert(struct oidset *set, const struct object_id *oid);
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/**
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* Remove the oid from the set.
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*
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* Returns 1 if the oid was present in the set, 0 otherwise.
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*/
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int oidset_remove(struct oidset *set, const struct object_id *oid);
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/**
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* Remove all entries from the oidset, freeing any resources associated with
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* it.
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*/
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void oidset_clear(struct oidset *set);
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struct oidset_iter {
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struct oidmap_iter m_iter;
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};
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static inline void oidset_iter_init(struct oidset *set,
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struct oidset_iter *iter)
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{
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oidmap_iter_init(&set->map, &iter->m_iter);
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}
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static inline struct object_id *oidset_iter_next(struct oidset_iter *iter)
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{
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struct oidmap_entry *e = oidmap_iter_next(&iter->m_iter);
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return e ? &e->oid : NULL;
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}
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static inline struct object_id *oidset_iter_first(struct oidset *set,
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struct oidset_iter *iter)
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{
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oidset_iter_init(set, iter);
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return oidset_iter_next(iter);
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}
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#endif /* OIDSET_H */
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