Haxe java.lang.Object 等效

Question

Haxe 允许 class 继承层次结构

class Honda extends Car {
...
}

所有对象是否有一个共同的继承层次根？我有一个可以包含任何对象的通用容器 class，我希望能够声明

var _contents:Object; //Any class instance in _contents

我该怎么做？

Answer 1

类的继承根是 Class<T>，因此以下应该有效：

var _contents:Class<T>;

但是，要存储 Enum，您必须改用 Enum<T>。

来自manual：

There is a special type in Haxe which is compatible with all classes:

Define: Class<T>

This type is compatible with all class types which means that all classes (not their instances) can be assigned to it. At compile-time, Class<T> is the common base type of all class types. However, this relation is not reflected in generated code.

This type is useful when an API requires a value to be a class, but not a specific one. This applies to several methods of the Haxe reflection API.

Answer 2

您还可以使用 {} 作为类型，它将接受 class 个实例以及匿名对象：

var _contents:{};

我们还有Dynamic，这基本上意味着"anything"（不仅是对象，还有Bool、Int等基元）。

如果您的 class 是一个通用容器，您可能希望使用类型参数键入其内容：

class Container<T> {
  var _contents:T;
  public function new(contents:T):Void {
    _contents = contents;
  }
}

然后：

var arrayContainer = new Container([]);
var stuffContainer = new Container({foo:"bar"});
var classContainer = new Container( new Stuff() );

Haxe java.lang.Object 等效

Haxe java.lang.Object Equivalent

inheritance

haxe

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