返回“这个”在C ++？ [英] return "this" in C++?

问题描述

在Java中，您可以简单地返回此以获取当前对象。在C ++中如何做？

In Java you can simply return this to get the current object. How do you do this in C++?

Java：

class MyClass {

    MyClass example() {
        return this;
    }
}

推荐答案

，首先，您不能从 void - 返回函数中返回任何内容。

Well, first off, you can't return anything from a void-returning function.

有三种方法返回一些提供对当前对象的访问：通过指针，通过引用和值。

There are three ways to return something which provides access to the current object: by pointer, by reference, and by value.

class myclass {
public:
   // Return by pointer needs const and non-const versions
         myclass* ReturnPointerToCurrentObject()       { return this; }
   const myclass* ReturnPointerToCurrentObject() const { return this; }

   // Return by reference needs const and non-const versions
         myclass& ReturnReferenceToCurrentObject()       { return *this; }
   const myclass& ReturnReferenceToCurrentObject() const { return *this; }

   // Return by value only needs one version.
   myclass ReturnCopyOfCurrentObject() const { return *this; }
};

如上所述，三种方法中的每一种都以略微不同的形式返回当前对象。您使用哪一种取决于您需要哪种形式。

As indicated, each of the three ways returns the current object in slightly different form. Which one you use depends upon which form you need.

这篇关于返回“这个”在C ++？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！