Struct TypedMetadata 

pub struct TypedMetadata { /* private fields */ }

Typed metadata bag — stores arbitrary Send + Sync + 'static values keyed by their concrete type.

At most one value per concrete type. To store multiple values of the same underlying type, use distinct newtype wrappers.

Example

use nv_core::TypedMetadata;

#[derive(Clone, Debug, PartialEq)]
struct DetectorScore(f32);

#[derive(Clone, Debug, PartialEq)]
struct TrackerScore(f32);

let mut meta = TypedMetadata::new();
meta.insert(DetectorScore(0.95));
meta.insert(TrackerScore(0.8));

assert_eq!(meta.get::<DetectorScore>(), Some(&DetectorScore(0.95)));
assert_eq!(meta.get::<TrackerScore>(), Some(&TrackerScore(0.8)));
assert_eq!(meta.len(), 2);

Implementations

impl TypedMetadata

pub fn new() -> TypedMetadata

Create an empty metadata bag.

pub fn insert<T>(&mut self, val: T) -> Option<T>

where T: Clone + Send + Sync + 'static,

Insert a value. If a value of this type already exists, it is replaced and the old value is returned.

pub fn get<T>(&self) -> Option<&T>

where T: 'static,

Get a reference to the stored value of type T, if present.

pub fn get_mut<T>(&mut self) -> Option<&mut T>

where T: 'static,

Get a mutable reference to the stored value of type T, if present.

pub fn remove<T>(&mut self) -> Option<T>

where T: 'static,

Remove and return the stored value of type T, if present.

pub fn contains<T>(&self) -> bool

where T: 'static,

Returns true if a value of type T is stored.

pub fn len(&self) -> usize

Number of entries.

pub fn is_empty(&self) -> bool

Returns true if the metadata bag is empty.

pub fn merge(&mut self, other: TypedMetadata)

Merge another TypedMetadata into this one.

Keys present in other overwrite keys in self (last-writer-wins).

Trait Implementations

impl Clone for TypedMetadata

fn clone(&self) -> TypedMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TypedMetadata

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

Formats the value using the given formatter.

impl Default for TypedMetadata

fn default() -> TypedMetadata

Returns the “default value” for a type.