Crate dynprops

Creating and extending objects with typed dynamic properties.

Example

use dynprops::{Subject, Dynamic};

let subject = Subject::new();
let prop_a = subject.new_prop_const_init(5);
let prop_b = subject.new_prop_const_init("Foo");
let mut obj = Dynamic::new(&subject);
assert_eq!(obj[&prop_a], 5);
assert_eq!(obj[&prop_b], "Foo");

// Properties can be changed on a mutable object
obj[&prop_b] = "Foobar";
assert_eq!(obj[&prop_b], "Foobar");

// New properties can be introduced after an object is already created
let prop_c = subject.new_prop_default_init::<u32>();
assert_eq!(obj[&prop_c], 0u32);

// Properties can be initialized based on a function of other properties on the object
let prop_d = subject.new_prop_fn_init(|obj| obj[&prop_b].len());
assert_eq!(obj[&prop_d], 6);

Structs

ConstInit

An Init which initializes values by cloning a given value.

DefaultInit

An Init which initializes values using Default::default().

Extended

Extends a value of type T with properties defined in a particular Subject<T>.

FnInit

An Init which initializes values by executing a closure.

Property

Identifies a property that is present on objects of the appropriate Subject.

Subject

Identifies a category of objects and a dynamic set of Propertys that apply to those objects. New properties can be introduced into the subject at any time using Subject::new_prop and its derivatives. When accessing a property of an object, the subject of the property must match the subject of the object.

Traits

Init

Defines how a Property is initialized when first accessed.

Type Aliases

ConstInitProperty

A shortcut for a Property that is initialized by a ConstInit.

DefaultInitProperty

A shortcut for a Property that is initialized by a DefaultInit.

DynInit

An Init that uses dynamic dispatch to defer to another Init at runtime.

DynInitProperty

A shortcut for a Property that is initialized by a DynInit. Any property can be converted into a DynInitProperty using Property::into_dyn_init.

Dynamic

An object consisting entirely of dynamic properties defined in a particular Subject.

FnInitProperty

A shortcut for a Property that is initialized by a FnInit.