How to set the type of a generic enum in Dart-CodePudding

Given the enum below:

enum Animal<T> {
  cow,
  goat;
}

How do I set the type?

If I do this:

void main() {
  final animal = Animal.cow;
}

Dart infers the type of animal to be Animal<dynamic>. However, I'm not able to set the type with any of the following ways:

// The static member 'cow' can't be accessed on a class instantiation.
final animal = Animal<int>.cow;

// `animal` is inferred to be `dynamic`, not `Animal<int>`.
final animal = Animal.cow<int>;

Of course, I'm not using the type anywhere, but this is the simplest example I can think of to demonstrate my question. How would I set the type to int?

CodePudding user response：

Enum values must be constant so the generic needs to be specified as part of initializing the enum values inside the enum definition.

So something like this:

enum Animal<T> {
  cow<String>(),
  goat<int>();
}

void main() {
  print(Animal.cow.runtimeType); // Animal<String>
  print(Animal.goat.runtimeType); // Animal<int>
}