Struct Singleton 

pub struct Singleton {
    pub name: Identifier,
    pub generics: Vec<GenericParam>,
    pub parents: Vec<Parent>,
    pub items: Vec<Item>,
    pub annotations: Vec<Attribute>,
    pub span: Span,
}

A singleton declaration.

Singletons are classes that have exactly one instance globally. They are useful for managing global state, configuration, or resources.

Example

singleton GlobalConfig {
    host: String = "localhost"
    port: i32 = 8080

    micro get_url(self) -> String {
        f"{self.host}:{self.port}"
    }
}

Semantics

• A singleton has exactly one global instance
• The instance is lazily initialized on first access
• Singleton members are accessed through the singleton name directly
• Singletons cannot be instantiated with constructors

Fields

name: Identifier

The singleton name.

generics: Vec<GenericParam>

Generic parameters for the singleton.

parents: Vec<Parent>

Parent traits this singleton implements.

items: Vec<Item>

Items (fields, methods) declared within the singleton.

annotations: Vec<Attribute>

Annotations applied to the singleton.

span: Span

The source code span.

Trait Implementations

impl Clone for Singleton

fn clone(&self) -> Singleton

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Singleton

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

Formats the value using the given formatter.

impl Default for Singleton

fn default() -> Singleton

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Singleton

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Singleton

impl Hash for Singleton

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 for Singleton

fn eq(&self, other: &Singleton) -> 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 Serialize for Singleton

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Singleton