在Dart中是什么意思？ [英] What does ~ mean in Dart?

问题描述

在Dart的一些代码示例中看到了波浪号。我已经看到它在C ++中用作析构函数，可以在其中调用它来删除对象的实例，它在Dart中具有相同的功能吗？ Java中是否有等效的符号？

Seen tilde in a few code examples in Dart. I've seen it used in C++ as a destructor where it can be called to delete the instance of a object Has it the same function in Dart? Is there an equivalent symbol in Java?

推荐答案

〜运算符为Dart对象上的可重载运算符，因此可以表示您想要的任何内容。在平台库中，唯一的用途是 int.operator〜进行按位求反（类似于C，Java和JavaScript中类似的整数运算符）。

The ~ operator is an overloadable operator on Dart objects, so it can mean anything you want it to. In the platform libraries, the only use is int.operator~ which does bitwise negation (like the similar integer operator in C, Java and JavaScript).

正如GüntherZöchbauer所提到的，〜也出现在可重载的〜/ 运算符中平台库用于 num.operator〜/ 的整数除法。默认情况下，〜或〜/ 运算符之间没有任何关系。

As Günther Zöchbauer mentions, the ~ also occurs in the overloadable ~/ operator which the platform libraries uses for integer division as num.operator~/. There is no relation between the ~ or ~/ operators by default.

因此，这并不意味着破坏。 Dart不允许进行明确的销毁，也不允许任何销毁-语言规范中没有说明对象死亡的时间。 （实现垃圾收集用户代码无法再看到的对象，以保留内存。）

So, it does not mean "destruction". Dart does not allow explicit destruction, or any destruction at all - the language specification doesn't say when an object dies. (Implementations garbage collect objects that the user code cannot see any more, to preserve memory).

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