如何创建类型别名

Question

如何为现有类型指定新名称？

假设我想给出一个List<String>名字Directives然后能够说出来directives = new Directives().

Answer 1

您无法定义别名.对于您的情况,您可以使用来自quiver的DelegatingList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);
}