git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_generate_hash_value.rst

   1 ===============================
   2 Generating hash values directly
   3 ===============================
   4
   5 .. index:: object: memcached_st
   6
   7 Hash a key value
   8
   9
  10 --------
  11 SYNOPSIS
  12 --------
  13
  14
  15 #include <libmemcached/memcached.h>
  16
  17 .. c:type:: memcached_hash_t
  18
  19 .. c:function:: uint32_t memcached_generate_hash_value (const char *key, size_t key_length, memcached_hash_t hash_algorithm)
  20
  21 .. c:function:: uint32_t memcached_generate_hash (memcached_st *ptr, const char *key, size_t key_length)
  22
  23 .. c:type:: MEMCACHED_HASH_DEFAULT
  24
  25 .. c:type:: MEMCACHED_HASH_MD5
  26
  27 .. c:type:: MEMCACHED_HASH_CRC
  28
  29 .. c:type:: MEMCACHED_HASH_FNV1_64
  30
  31 .. c:type:: MEMCACHED_HASH_FNV1A_64
  32
  33 .. c:type:: MEMCACHED_HASH_FNV1_32
  34
  35 .. c:type:: MEMCACHED_HASH_FNV1A_32
  36
  37 .. c:type:: MEMCACHED_HASH_JENKINS
  38
  39 .. c:type:: MEMCACHED_HASH_MURMUR
  40
  41 .. c:type:: MEMCACHED_HASH_HSIEH
  42
  43 .. c:type:: MEMCACHED_HASH_MURMUR3
  44
  45
  46 Compile and link with -lmemcachedutil -lmemcached
  47
  48
  49 -----------
  50 DESCRIPTION
  51 -----------
  52
  53
  54 :c:func:`memcached_generate_hash_value` allows you to hash a key using one of
  55 the hash functions defined in the library. This method is provided for
  56 the convenience of higher-level language bindings and is not necessary
  57 for normal memcache operations.
  58
  59 The allowed hash algorithm constants are listed in the manpage for
  60 :c:func:`memcached_behavior_set`.
  61
  62 :c:func:`memcached_generate_hash` takes a :c:type:`memcached_st` struture
  63 and produces the hash value that would have been generated based on the
  64 defaults of :c:type:`memcached_st`.
  65
  66 As of version 0.36 all hash methods have been placed into the library
  67 libhashkit(3) which is linked with libmemcached(3). For more information please see its documentation.
  68
  69
  70 ------
  71 RETURN
  72 ------
  73
  74
  75 A 32-bit integer which is the result of hashing the given key.
  76 For 64-bit hash algorithms, only the least-significant 32 bits are
  77 returned.
  78
  79
  80 ----
  81 HOME
  82 ----
  83
  84
  85 To find out more information please check:
  86 `http://libmemcached.org/ <http://libmemcached.org/>`_
  87
  88
  89 ------
  90 AUTHOR
  91 ------
  92
  93
  94 Brian Aker, <brian@tangent.org>
  95
  96
  97 --------
  98 SEE ALSO
  99 --------
 100
 101
 102 :manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`