返回“这个"在 C++ 中?

问题描述

在 Java 中，您可以简单地 return this 来获取当前对象.你如何在 C++ 中做到这一点?

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，你不能从 void-returning 函数返回任何东西.

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

有三种方法可以返回提供对当前对象的访问的东西:通过指针、通过引用和通过值.

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; }
};

如前所述，这三种方式中的每一种都以略有不同的形式返回当前对象.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.

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