1BSON_OID_T(3)                       libbson                      BSON_OID_T(3)
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NAME

6       bson_oid_t - bson_oid_t
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8       BSON ObjectID Abstraction
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SYNOPSIS

11          #include <bson/bson.h>
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13          typedef struct {
14             uint8_t bytes[12];
15          } bson_oid_t;
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DESCRIPTION

18       The bson_oid_t structure contains the 12-byte ObjectId notation defined
19       by the BSON ObjectID specification.
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21       ObjectId is a 12-byte BSON type, constructed using:
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23       • a 4-byte value representing the seconds since the Unix epoch (in  Big
24         Endian).
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26       • a 5-byte random value.
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28       • a 3-byte counter (Big Endian), starting with a random value.
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STRING CONVERSION

31       You can convert an Object ID to a string using bson_oid_to_string() and
32       back with bson_oid_init_from_string().
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HASHING

35       A  bson_oid_t  can  be  used   in   hashtables   using   the   function
36       bson_oid_hash() and bson_oid_equal().
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COMPARING

39       A  bson_oid_t  can  be compared to another using bson_oid_compare() for
40       qsort() style comparing and bson_oid_equal() for direct equality.
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VALIDATING

43       You can validate that a string containing  a  hex-encoded  ObjectID  is
44       valid using the function bson_oid_is_valid().
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EXAMPLE

47          #include <bson/bson.h>
48          #include <stdio.h>
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50          int
51          main (int argc, char *argv[])
52          {
53             bson_oid_t oid;
54             char str[25];
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56             bson_oid_init (&oid, NULL);
57             bson_oid_to_string (&oid, str);
58             printf ("%s\n", str);
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60             if (bson_oid_is_valid (str, sizeof str)) {
61                bson_oid_init_from_string (&oid, str);
62             }
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64             printf ("The UNIX time was: %u\n", (unsigned) bson_oid_get_time_t (&oid));
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66             return 0;
67          }
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AUTHOR

70       MongoDB, Inc
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73       2017-present, MongoDB, Inc
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781.17.6                           Jun 03, 2021                    BSON_OID_T(3)
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