Dart：如何定义嵌套泛型？

Question

我有以下类（见下文）。如何将一个泛型类型放入另一个泛型类型？

class MySet<T> extends MyCollection<T>{}

class MyList<T> extends MyCollection<T>{}

class MyCollection<T> {}

// It works but MyCollection has no type
class MyProvider<C extends MyCollection> {}

// It does not work. What is the correct way here?
class MyProvider<C extends MyCollection<T>> {}

Answer 1

你必须先定义第二个泛型，然后在嵌套泛型中使用它class:

    //Define T as second generic type
    class MyProvider<T,C extends MyCollection<T>> {}

Dart：如何定义嵌套泛型？

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dart

flutter