Implements<T> class Null safety

Marks a union type to implement the interface stringType or type T. In the case below City will implement AdministrativeArea<Hoouse>.

@freezed
abstract class Example with _$Example {
  const factory Example.person(String name, int age) = Person;

  @Implements<AdministrativeArea<House>>()
  const factory Example.city(String name, int population) = City;
}

If interface is generic the Implements.fromString constructor must be used otherwise freezed will generate correct codee but dart will throw a load error on the annotation declaration.

Note: You need to make sure that you comply with the interface requirements by implementing all the abstract members. If the interface has no members or just fields you can fulfil the interface contract by adding them in the constructor of the union type. Keep in mind that if the interface defines a method or a getter, that you implement in the class, you need to use the Custom getters and methods instructions.

Constructors

Implements()

Marks a union type to implement the interface T.

const

Implements.fromString(String? stringType)

Marks a union type to implement the interface stringType. This constructor must be used when implementing a generic class with a generic type parameter e.g. AdministrativeArea<T> otherwise dart will throw a load error when compiling the annotation.

const

Properties

hashCode → int

The hash code for this object.

read-only, inherited

runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

stringType → String?

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited