C++中this指针用法详解及实例_this指针资源-CSDN下载

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C++中中this指针用法详解及实例指针用法详解及实例

C++中中this指针用法详解及实例指针用法详解及实例

概要：概要：

本文简单介绍this指针的基本概念，并通过一个实际例子介绍this指针用于防止变量命名冲突和用于类中层叠式调用的两个用

法。

this指针概览指针概览

C++中，每个类对应了一个对象，每个对象指向自己所在内存地址的方式即为使用this指针。在类中，this指针作为一个变量

通过编译器隐式传递给非暂存(non-static)成员函数。因为this指针不是对象本身，因此sizeof函数并不能用于确定this指针所对

应的对象大小。this指针的具体类型与具体对象的类型以及对象是否被const关键字修饰有关。例如，在类Employee的非常量

函数中，this指针类型为Employee ，若为常量函数，则this指针类型为const Employee 。由于this本身是一个指向对象的指

针，因此*this这类去指针操作则得到本类中对象的地址。关于this指针的使用，举例如下：

本文代码引用和免责声明：

/**************************************************************************

* (C) Copyright 1992-2012 by Deitel & Associates, Inc. and *

* Pearson Education, Inc. All Rights Reserved. *

* *

* DISCLAIMER: The authors and publisher of this book have used their *

* best efforts in preparing the book. These efforts include the *

* development, research, and testing of the theories and programs *

* to determine their effectiveness. The authors and publisher make *

* no warranty of any kind, expressed or implied, with regard to these *

* programs or to the documentation contained in these books. The authors *

* and publisher shall not be liable in any event for incidental or *

* consequential damages in connection with, or arising out of, the *

* furnishing, performance, or use of these programs. *

**************************************************************************/

Test.h文件：

#ifndef TEST_H

#define TEST_H

class Test

{

public:

explicit Test( int = 0 ); // default constructor

void print() const;

private:

int x;

}; // end class Test

#endif /* TEST_H */

Test.cpp文件：

#include "Test.h"

#include <iostream>

using namespace std;

// constructor

Test::Test( int value ) : x( value ){}

// print x using implicit and explicit this pointers;

// the parentheses around *this are required

void Test::print() const

{

// implicitly use the this pointer to access the member x

cout << " x = " << x;

// explicitly use the this pointer and the arrow operator

// to access the member x

cout << " this->x = " << this->x;

// explicitly use the dereferenced this pointer and

// the dot operator to access the member x

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