Struct NonNilUuid 

pub struct NonNilUuid(/* private fields */);

A UUID that is guaranteed not to be the nil UUID.

This is useful for representing optional UUIDs more efficiently, as Option<NonNilUuid> takes up the same space as Uuid.

Note that Uuids created by the following methods are guaranteed to be non-nil:

• [Uuid::new_v1]
• [Uuid::now_v1]
• [Uuid::new_v3]
• Uuid::new_v4
• [Uuid::new_v5]
• [Uuid::new_v6]
• [Uuid::now_v6]
• [Uuid::new_v7]
• [Uuid::now_v7]
• [Uuid::new_v8]

ABI

The NonNilUuid type does not yet have a stable ABI. Its representation or alignment may change. It is currently only guaranteed that NonNilUuid and Option<NonNilUuid> are the same size as Uuid.

Implementations

impl NonNilUuid

pub const fn new(uuid: Uuid) -> Option<Self>

Creates a non-nil UUID if the value is non-nil.

pub const unsafe fn new_unchecked(uuid: Uuid) -> Self

Creates a non-nil without checking whether the value is non-nil. This results in undefined behavior if the value is nil.

Safety

The value must not be nil.

pub const fn get(self) -> Uuid

Get the underlying Uuid value.

Trait Implementations

impl Clone for NonNilUuid

fn clone(&self) -> NonNilUuid

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NonNilUuid

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for NonNilUuid

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<NonNilUuid> for Uuid

fn from(non_nil: NonNilUuid) -> Self

Converts a NonNilUuid back into a Uuid.

Examples

let uuid = Uuid::from_u128(0x0123456789abcdef0123456789abcdef);
let non_nil = NonNilUuid::try_from(uuid).unwrap();
let uuid_again = Uuid::from(non_nil);

assert_eq!(uuid, uuid_again);

impl Hash for NonNilUuid

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<NonNilUuid> for Uuid

fn eq(&self, other: &NonNilUuid) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<Uuid> for NonNilUuid

fn eq(&self, other: &Uuid) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq for NonNilUuid

fn eq(&self, other: &NonNilUuid) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<Uuid> for NonNilUuid

fn try_from(uuid: Uuid) -> Result<Self, Self::Error>

Attempts to convert a Uuid into a NonNilUuid.

Examples

let uuid = Uuid::from_u128(0x0123456789abcdef0123456789abcdef);
let non_nil = NonNilUuid::try_from(uuid).unwrap();

type Error = Error

The type returned in the event of a conversion error.

impl Copy for NonNilUuid

impl Eq for NonNilUuid

impl StructuralPartialEq for NonNilUuid

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes