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87571c3f71
Inspired by list_for_each_entry in the Linux kernel. Once again, these are somewhat compromised usability-wise by compilers lacking __typeof__ support. Signed-off-by: Eric Wong <e@80x24.org> Reviewed-by: Derrick Stolee <stolee@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#ifndef OIDMAP_H
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#define OIDMAP_H
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#include "cache.h"
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#include "hashmap.h"
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/*
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* struct oidmap_entry is a structure representing an entry in the hash table,
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* which must be used as first member of user data structures.
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*
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* Users should set the oid field. oidmap_put() will populate the
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* internal_entry field.
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*/
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struct oidmap_entry {
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/* For internal use only */
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struct hashmap_entry internal_entry;
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struct object_id oid;
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};
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struct oidmap {
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struct hashmap map;
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};
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#define OIDMAP_INIT { { NULL } }
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/*
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* Initializes an oidmap structure.
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*
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* `map` is the oidmap to initialize.
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*
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* If the total number of entries is known in advance, the `initial_size`
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* parameter may be used to preallocate a sufficiently large table and thus
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* prevent expensive resizing. If 0, the table is dynamically resized.
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*/
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void oidmap_init(struct oidmap *map, size_t initial_size);
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/*
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* Frees an oidmap structure and allocated memory.
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*
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* If `free_entries` is true, each oidmap_entry in the map is freed as well
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* using stdlibs free().
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*/
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void oidmap_free(struct oidmap *map, int free_entries);
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/*
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* Returns the oidmap entry for the specified oid, or NULL if not found.
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*/
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void *oidmap_get(const struct oidmap *map,
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const struct object_id *key);
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/*
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* Adds or replaces an oidmap entry.
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*
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* ((struct oidmap_entry *) entry)->internal_entry will be populated by this
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* function.
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*
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* Returns the replaced entry, or NULL if not found (i.e. the entry was added).
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*/
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void *oidmap_put(struct oidmap *map, void *entry);
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/*
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* Removes an oidmap entry matching the specified oid.
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*
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* Returns the removed entry, or NULL if not found.
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*/
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void *oidmap_remove(struct oidmap *map, const struct object_id *key);
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struct oidmap_iter {
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struct hashmap_iter h_iter;
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};
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static inline void oidmap_iter_init(struct oidmap *map, struct oidmap_iter *iter)
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{
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hashmap_iter_init(&map->map, &iter->h_iter);
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}
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static inline void *oidmap_iter_next(struct oidmap_iter *iter)
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{
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/* TODO: this API could be reworked to do compile-time type checks */
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return (void *)hashmap_iter_next(&iter->h_iter);
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}
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static inline void *oidmap_iter_first(struct oidmap *map,
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struct oidmap_iter *iter)
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{
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oidmap_iter_init(map, iter);
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/* TODO: this API could be reworked to do compile-time type checks */
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return (void *)oidmap_iter_next(iter);
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}
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#endif
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