Question

如何为现有类型指定新名称？

假设我想给List<String>名称Directives，然后能够说directives = new Directives()。

Answer 1

您无法定义别名。对于您的情况，您可以使用DelegatingList from quiver来定义Directives：

import 'package:quiver/collection.dart';

class Directives extends DelegatingList<String> {
  final List<String> delegate = [];
}

Answer 2

现在可以通过一个空的mixin

mixin ToAlias{}

class Stuff<T> {
  T value;
  Stuff(this.value);
}

class StuffInt = Stuff<int> with ToAlias;

main() {
  var stuffInt = StuffInt(3);
}

如何创建类型别名

2 个答案: