Struct PropertyCollection 

pub struct PropertyCollection { /* private fields */ }

Dynamic collection of properties.

Implementations

impl PropertyCollection

pub fn new() -> Self

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

Retrieves the value of a property of a specific type from the PropertyCollection.

Type Parameters

• T: The type of the property to retrieve. It should be a type that implements the Any

Returns

• Some(&T) if the property of type T exists.
• None if the property is not found.

pub fn assign<T: Any>(&mut self, value: T)

Assigns the value to a property or adds a new property with the specified value.

This function assigns the provided value to an existing property of the specified type T if it already exists in the collection. If no property of that type exists, a new property of that type is added to the collection with the specified value.

Type Parameters

• T: The type of the property to assign. It should be a type that implements the Any

Parameters

• value: The value of type T to assign to the property.

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

Checks if a property of a specified type exists in the collection.

Returns

• true - If a property of the specified type T exists in the collection.
• false - If no property of the specified type T is found in the collection.

pub fn subscribe<T: Any>(&mut self, callback: impl FnMut(&T) + 'static)

Subscribes to changes in a property of a specific type in the PropertyCollection.

This function attempts to subscribe to changes in a property of the specified type T in the PropertyCollection. If the property exists and its type matches T, it registers the provided callback function to be called when the property’s value changes. If the property does not exist in the collection yet, an early subscription is performed by adding the callback to ab empty property of type T. This allows the callback to be called when the property is assigned a value later.

Arguments

• callback - The callback function to be called when the property’s value changes.

Example

use dynp::PropertyCollection;

// define a custom property using the Newtype pattern
#[derive(Copy, Clone, Debug)]
struct CustomProperty(i32);

fn main() {
    // create a new property collection
    let mut collection = PropertyCollection::new();
    collection.subscribe::<CustomProperty>(|value: &CustomProperty| {
        println!("Property changed: {:?}", value);
    });

    // assign a new property
    collection.assign(CustomProperty(42));
}

Trait Implementations

impl Debug for PropertyCollection

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

Formats the value using the given formatter.