dart - 如何在Dart中初始化一个空的LinkedList ？

Question

我正在尝试在 Dart 中创建T类型的链接列表

var list = LinkedList<T>();

但是编辑说

'T' doesn't extend 'LinkedListEntry'. Try using a type that is or is a subclass of 'LinkedListEntry'.

Answer 1

基本用法示例:

import 'dart:collection';

void main() {
  var list = LinkedList<MyEntry>();
  list.add(MyEntry(1));
  list.add(MyEntry(2));
  list.add(MyEntry(3));
  print(list);
  print(list.last.previous);  
  list.last.previous.unlink();
  print(list);
}

class MyEntry extends LinkedListEntry<MyEntry> {
  final int id;
  MyEntry(this.id);

  @override
  String toString() {
    return '$id';
  }
}

结果:

(1,2,3)
2
(1，3)