A Universally Unique Identifier (UUID).
Creates a Urn
instance from a Uuid
.
Uuid
namespace for Domain Name System (DNS).
Uuid
namespace for ISO Object Identifiers (OIDs).
Uuid
namespace for Uniform Resource Locators (URLs).
Uuid
namespace for X.500 Distinguished Names (DNs).
The 'nil UUID'.
The nil UUID is special form of UUID that is specified to have all
128 bits set to zero, as defined in IETF RFC 4122 Section 4.1.7.
Basic usage:
use uuid::Uuid;
let uuid = Uuid::nil();
assert_eq!(
uuid.to_hyphenated().to_string(),
"00000000-0000-0000-0000-000000000000"
);
Creates a Uuid
from four field values.
This function will return an error if d4
's length is not 8 bytes.
Basic usage:
use uuid::Uuid;
let d4 = [12, 3, 9, 56, 54, 43, 8, 9];
let uuid = Uuid::from_fields(42, 12, 5, &d4);
let uuid = uuid.map(|uuid| uuid.to_hyphenated().to_string());
let expected_uuid =
Ok(String::from("0000002a-000c-0005-0c03-0938362b0809"));
assert_eq!(expected_uuid, uuid);
An invalid length:
use uuid::prelude::*;
let d4 = [12];
let uuid = uuid::Uuid::from_fields(42, 12, 5, &d4);
let expected_uuid = Err(uuid::BytesError::new(8, d4.len()));
assert_eq!(expected_uuid, uuid);
Creates a Uuid
using the supplied bytes.
This function will return an error if b
has any length other than 16.
Basic usage:
use uuid::Uuid;
let bytes = [4, 54, 67, 12, 43, 2, 98, 76, 32, 50, 87, 5, 1, 33, 43, 87];
let uuid = Uuid::from_slice(&bytes);
let uuid = uuid.map(|uuid| uuid.to_hyphenated().to_string());
let expected_uuid =
Ok(String::from("0436430c-2b02-624c-2032-570501212b57"));
assert_eq!(expected_uuid, uuid);
An incorrect number of bytes:
use uuid::prelude::*;
let bytes = [4, 54, 67, 12, 43, 2, 98, 76];
let uuid = Uuid::from_slice(&bytes);
let expected_uuid = Err(uuid::BytesError::new(16, 8));
assert_eq!(expected_uuid, uuid);
Creates a Uuid
using the supplied bytes.
Basic usage:
use uuid::Bytes;
use uuid::Uuid;
let bytes: Bytes = [
70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90, 145, 63,
62,
];
let uuid = Uuid::from_bytes(bytes);
let uuid = uuid.to_hyphenated().to_string();
let expected_uuid = String::from("46ebd0ee-0e6d-43c9-b90d-ccc35a913f3e");
assert_eq!(expected_uuid, uuid);
An incorrect number of bytes:
use uuid::Uuid;
use uuid::UuidBytes;
let bytes: UuidBytes = [4, 54, 67, 12, 43, 2, 98, 76];
compile
let uuid = Uuid::from_bytes(bytes);
Creates a v4 Uuid from random bytes (e.g. bytes supplied from Rand
crate)
Basic usage:
use uuid::Bytes;
use uuid::Uuid;
let bytes: Bytes = [
70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90, 145, 63,
62,
];
let uuid = Uuid::from_random_bytes(bytes);
let uuid = uuid.to_hyphenated().to_string();
let expected_uuid = String::from("46ebd0ee-0e6d-43c9-b90d-ccc35a913f3e");
assert_eq!(expected_uuid, uuid);
Returns the variant of the Uuid
structure.
This determines the interpretation of the structure of the UUID.
Currently only the RFC4122 variant is generated by this module.
Returns the version number of the Uuid
.
This represents the algorithm used to generate the contents.
Currently only the Random (V4) algorithm is supported by this
module. There are security and privacy implications for using
older versions - see Wikipedia: Universally Unique Identifier for
details.
Returns the version of the Uuid
.
This represents the algorithm used to generate the contents
Returns the four field values of the UUID.
These values can be passed to the from_fields()
method to get the
original Uuid
back.
- The first field value represents the first group of (eight) hex
digits, taken as a big-endian
u32
value. For V1 UUIDs, this field
represents the low 32 bits of the timestamp.
- The second field value represents the second group of (four) hex
digits, taken as a big-endian
u16
value. For V1 UUIDs, this field
represents the middle 16 bits of the timestamp.
- The third field value represents the third group of (four) hex
digits, taken as a big-endian
u16
value. The 4 most significant
bits give the UUID version, and for V1 UUIDs, the last 12 bits
represent the high 12 bits of the timestamp.
- The last field value represents the last two groups of four and
twelve hex digits, taken in order. The first 1-3 bits of this
indicate the UUID variant, and for V1 UUIDs, the next 13-15 bits
indicate the clock sequence and the last 48 bits indicate the node
ID.
use uuid::Uuid;
let uuid = Uuid::nil();
assert_eq!(uuid.as_fields(), (0, 0, 0, &[0u8; 8]));
let uuid = Uuid::parse_str("936DA01F-9ABD-4D9D-80C7-02AF85C822A8").unwrap();
assert_eq!(
uuid.as_fields(),
(
0x936DA01F,
0x9ABD,
0x4D9D,
b"\x80\xC7\x02\xAF\x85\xC8\x22\xA8"
)
);
Returns an array of 16 octets containing the UUID data.
use uuid::Uuid;
let uuid = Uuid::nil();
assert_eq!(uuid.as_bytes(), &[0; 16]);
let uuid = Uuid::parse_str("936DA01F9ABD4d9d80C702AF85C822A8").unwrap();
assert_eq!(
uuid.as_bytes(),
&[
147, 109, 160, 31, 154, 189, 77, 157, 128, 199, 2, 175, 133, 200,
34, 168
]
);
Returns an Optional Tuple of (u64, u16) representing the timestamp and
counter portion of a V1 UUID. If the supplied UUID is not V1, this
will return None
Parses a Uuid
from a string of hexadecimal digits with optional
hyphens.
Any of the formats generated by this module (simple, hyphenated, urn)
are supported by this parsing function.
Formats the value using the given formatter.
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
The associated error which can be returned from parsing.
Parses a string s
to return a value of this type. Read more
Formats the value using the given formatter. Read more
Performs copy-assignment from source
. Read more
Returns the "default value" for a type. Read more
This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the minimum of two values. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Formats the value using the given formatter.
Deserialize this value from the given Serde deserializer. Read more
Serialize this value into the given Serde serializer. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static