Struct zng_app_context::AppId

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

Identifies an app instance.

Memory

The internal number is a NonZeroU32, that means that Option<AppId> and AppId are the same size as u32.

As Hash

The generated internal number has good statistical distribution and can be used as its own hash, although it is not cryptographically safe, as it is simply a sequential counter scrambled using a modified splitmix64.

Static

The unique ID cannot be generated at compile time, but you can use the static_id! macro to declare a lazy static that instantiates the ID.

Implementations

impl AppId

pub fn new_unique() -> Self

Generates a new unique ID.

pub fn get(self) -> u32

Retrieve the underlying value.

pub fn sequential(self) -> u32

Un-scramble the underlying value to get the original sequential count number.

If two IDs, id0 and id1 where generated by the same thread then id0.sequential() < id1.sequential().

pub fn from_raw(raw: u32) -> Self

Creates an ID from a raw value.

The value must not be zero, panics if it is, the value must have been provided by get otherwise the ID will not be unique.

pub fn from_sequential(num: u32) -> Self

Creates an ID from a sequential number.

Safety

The value must not be zero, panics if it is, the value must have been provided by sequential otherwise the ID will not be unique.

impl AppId

pub fn named(name: impl Into<Txt>) -> Self

Get or generate an ID with associated name.

If the name is already associated with an ID, returns it. If the name is new, generates a new ID and associated it with the name. If name is an empty string just returns a new ID.

pub fn debug_named(name: impl Into<Txt>) -> Self

Calls named in a debug build and new_unique in a release build.

pub fn named_new(name: impl Into<Txt>) -> Result<Self, IdNameError<Self>>

Generate a new ID with associated name.

If the name is already associated with an ID, returns the NameUsed error. If the name is an empty string just returns a new ID.

pub fn name(self) -> Txt

Returns the name associated with the ID or "".

pub fn set_name(self, name: impl Into<Txt>) -> Result<(), IdNameError<Self>>

Associate a name with the ID, if it is not named.

If the name is already associated with a different ID, returns the NameUsed error. If the ID is already named, with a name different from name, returns the AlreadyNamed error. If the name is an empty string or already is the name of the ID, does nothing.

Trait Implementations

impl Clone for AppId

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AppId

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AppId

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for AppId

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

Formats the value using the given formatter.

impl Hash for AppId

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

where H: Hasher,

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 for AppId

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for AppId

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl UniqueId for AppId

fn new_unique() -> Self

New unique ID.

impl Copy for AppId

impl Eq for AppId

impl NoUninit for AppId

impl PodInOption for AppId

impl ZeroableInOption for AppId