Struct Metadata 

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

A type-erased container for metadata that can be associated with computation results.

Metadata allows attaching arbitrary typed information to computation results and passing it through the computation pipeline.

Implementations

impl Metadata

pub fn new() -> Self

Creates a new, empty metadata container.

pub fn get<T: 'static + Clone>(&self) -> T

Gets a value of type T from the metadata.

Panics

Panics if no value of type T is present in the metadata.

pub fn try_get<T: 'static + Clone>(&self) -> Option<T>

Attempts to get a value of type T from the metadata.

Returns None if no value of the requested type is present.

pub fn with<T: 'static + Clone>(self, value: T) -> Self

Adds a value to the metadata and returns the updated metadata.

This method is chainable for fluent API usage.

pub fn is_empty(&self) -> bool

Checks if the metadata container is empty.

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metadata

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

Formats the value using the given formatter.

impl Default for Metadata

fn default() -> Metadata

Returns the “default value” for a type.