Struct edn::Uuid
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pub struct Uuid { /* fields omitted */ }
A Universally Unique Identifier (UUID).
Methods
impl Uuid
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pub fn nil() -> Uuid
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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.
Examples
Basic usage:
use uuid::Uuid; let uuid = Uuid::nil(); assert_eq!(uuid.hyphenated().to_string(), "00000000-0000-0000-0000-000000000000");
pub fn new(v: UuidVersion) -> Option<Uuid>
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Creates a new Uuid
.
Note that not all versions can be generated currently and None
will be
returned if the specified version cannot be generated.
To generate a random UUID (UuidVersion::Random
), then the v4
feature must be enabled for this crate.
pub fn new_v4() -> Uuid
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Creates a random Uuid
.
This uses the rand
crate's default task RNG as the source of random numbers.
If you'd like to use a custom generator, don't use this method: use the
rand::Rand trait
's rand()
method instead.
Note that usage of this method requires the v4
feature of this crate
to be enabled.
Examples
Basic usage:
use uuid::Uuid; let uuid = Uuid::new_v4();
pub fn from_fields(
d1: u32,
d2: u16,
d3: u16,
d4: &[u8]
) -> Result<Uuid, ParseError>
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d1: u32,
d2: u16,
d3: u16,
d4: &[u8]
) -> Result<Uuid, ParseError>
Creates a Uuid
from four field values.
Errors
This function will return an error if d4
's length is not 8 bytes.
Examples
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.hyphenated().to_string()); let expected_uuid = Ok(String::from("0000002a-000c-0005-0c03-0938362b0809")); assert_eq!(expected_uuid, uuid);
An invalid length:
use uuid::Uuid; use uuid::ParseError; let d4 = [12]; let uuid = Uuid::from_fields(42, 12, 5, &d4); let expected_uuid = Err(ParseError::InvalidLength(1)); assert_eq!(expected_uuid, uuid);
pub fn from_bytes(b: &[u8]) -> Result<Uuid, ParseError>
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Creates a Uuid
using the supplied bytes.
Errors
This function will return an error if b
has any length other than 16.
Examples
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_bytes(&bytes); let uuid = uuid.map(|uuid| uuid.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::Uuid; use uuid::ParseError; let bytes = [4, 54, 67, 12, 43, 2, 98, 76]; let uuid = Uuid::from_bytes(&bytes); let expected_uuid = Err(ParseError::InvalidLength(8)); assert_eq!(expected_uuid, uuid);
pub fn get_variant(&self) -> Option<UuidVariant>
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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.
pub fn get_version_num(&self) -> usize
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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.
pub fn get_version(&self) -> Option<UuidVersion>
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Returns the version of the Uuid
.
This represents the algorithm used to generate the contents
pub fn as_bytes(&self) -> &[u8; 16]
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Return an array of 16 octets containing the UUID data
Examples
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]);
pub fn simple(&self) -> Simple
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Returns a wrapper which when formatted via fmt::Display
will format a
string of 32 hexadecimal digits.
Examples
use uuid::Uuid; let uuid = Uuid::nil(); assert_eq!(uuid.simple().to_string(), "00000000000000000000000000000000");
pub fn hyphenated(&self) -> Hyphenated
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Returns a wrapper which when formatted via fmt::Display
will format a
string of hexadecimal digits separated into groups with a hyphen.
Examples
use uuid::Uuid; let uuid = Uuid::nil(); assert_eq!(uuid.hyphenated().to_string(), "00000000-0000-0000-0000-000000000000");
pub fn urn(&self) -> Urn
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Returns a wrapper which when formatted via fmt::Display
will format a
string of the UUID as a full URN string.
Examples
use uuid::Uuid; let uuid = Uuid::nil(); assert_eq!(uuid.urn().to_string(), "urn:uuid:00000000-0000-0000-0000-000000000000");
pub fn to_timestamp(&self) -> Option<(u64, u16)>
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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
pub fn parse_str(input: &str) -> Result<Uuid, ParseError>
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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.
pub fn is_nil(&self) -> bool
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Tests if the UUID is nil
Trait Implementations
impl Ord for Uuid
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fn cmp(&self, __arg_0: &Uuid) -> Ordering
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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
impl Serialize for Uuid
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fn serialize<S>(
&self,
serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
S: Serializer,
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&self,
serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
S: Serializer,
Serialize this value into the given Serde serializer. Read more
impl Copy for Uuid
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impl Clone for Uuid
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fn clone(&self) -> Uuid
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl Debug for Uuid
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
impl PartialOrd<Uuid> for Uuid
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fn partial_cmp(&self, __arg_0: &Uuid) -> Option<Ordering>
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This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, __arg_0: &Uuid) -> bool
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This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, __arg_0: &Uuid) -> bool
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This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, __arg_0: &Uuid) -> bool
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This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, __arg_0: &Uuid) -> bool
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This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl Rand for Uuid
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Generates a random Uuid
(V4 conformant).
fn rand<R>(rng: &mut R) -> Uuid where
R: Rng,
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R: Rng,
Generates a random instance of this type using the specified source of randomness. Read more
impl<'de> Deserialize<'de> for Uuid
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fn deserialize<D>(
deserializer: D
) -> Result<Uuid, <D as Deserializer<'de>>::Error> where
D: Deserializer<'de>,
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deserializer: D
) -> Result<Uuid, <D as Deserializer<'de>>::Error> where
D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
impl Hash for Uuid
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fn hash<S>(&self, state: &mut S) where
S: Hasher,
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S: Hasher,
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl FromStr for Uuid
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type Err = ParseError
The associated error which can be returned from parsing.
fn from_str(us: &str) -> Result<Uuid, ParseError>
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Parse a hex string and interpret as a Uuid
.
Accepted formats are a sequence of 32 hexadecimal characters, with or without hyphens (grouped as 8, 4, 4, 4, 12).
impl Default for Uuid
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impl PartialEq<Uuid> for Uuid
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fn eq(&self, __arg_0: &Uuid) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Uuid) -> bool
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This method tests for !=
.