mirror of
https://github.com/git/git
synced 2024-10-31 01:43:41 +00:00
afab0fe052
Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
52 lines
1.4 KiB
Text
52 lines
1.4 KiB
Text
hash API
|
|
========
|
|
|
|
The hash API is a collection of simple hash table functions. Users are expected
|
|
to implement their own hashing.
|
|
|
|
Data Structures
|
|
---------------
|
|
|
|
`struct hash_table`::
|
|
|
|
The hash table structure. The `array` member points to the hash table
|
|
entries. The `size` member counts the total number of valid and invalid
|
|
entries in the table. The `nr` member keeps track of the number of
|
|
valid entries.
|
|
|
|
`struct hash_table_entry`::
|
|
|
|
An opaque structure representing an entry in the hash table. The `hash`
|
|
member is the entry's hash key and the `ptr` member is the entry's
|
|
value.
|
|
|
|
Functions
|
|
---------
|
|
|
|
`init_hash`::
|
|
|
|
Initialize the hash table.
|
|
|
|
`free_hash`::
|
|
|
|
Release memory associated with the hash table.
|
|
|
|
`insert_hash`::
|
|
|
|
Insert a pointer into the hash table. If an entry with that hash
|
|
already exists, a pointer to the existing entry's value is returned.
|
|
Otherwise NULL is returned. This allows callers to implement
|
|
chaining, etc.
|
|
|
|
`lookup_hash`::
|
|
|
|
Lookup an entry in the hash table. If an entry with that hash exists
|
|
the entry's value is returned. Otherwise NULL is returned.
|
|
|
|
`for_each_hash`::
|
|
|
|
Call a function for each entry in the hash table. The function is
|
|
expected to take the entry's value as its only argument and return an
|
|
int. If the function returns a negative int the loop is aborted
|
|
immediately. Otherwise, the return value is accumulated and the sum
|
|
returned upon completion of the loop.
|