匿名班

问题描述

在Java中，通常编写以下代码（例如，用于事件处理）以利用模板方法模式：

In Java, it's common to write the following (e.g. for event handling) in order to make use of the template method pattern:

abstract class SomeAbstractClass {
    public abstract void SomeFunction ();
}

//...

SomeAbstractClass obj = new SomeAbstractClass () {
    public void SomeFunction () { /* implementation */ }
};

在C ++中，将编译以下内容：

In C++, the following compiles:

class SomeAbstractClass {
    virtual void SomeFunction () = 0;
};

// ...

SomeAbstractClass * obj = new ( class : public SomeAbstractClass {
    virtual void SomeFunction () { /* implementation */ }
});

为什么人们通常不这样做？

Why don't people do this usually?

推荐答案

我认为匿名类会出现三个问题

Three problems i think occurs with anonymous class

• 您不能将构造函数编写为类


• 初始化器列表继承是不允许的。


• 捕获值也很困难，最终变量只能访问。
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• You cannot write a constructor as class doesn't have a name.
• initializer list inheritance is not allowed.
• capturing value is also difficult, final variable are accessible only.

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