this 指针

//
//  main.cpp
//  this指针
//
//  created by mac on 2019/5/2.
//  copyright © 2019年 mac. all rights reserved.
//  默认情况下,编译器为类的每个成员函数提供了一个隐式形参，该隐式形参成为this

#include <iostream>

using namespace std;

class example{
private:
    int x;
public:
    example(int a){
        this->x=a;
    }
    void setvalue(int);
    void printaddressandvalue()const;
    
};

void example::setvalue(int a){
    this->x=a;
}

void example::printaddressandvalue()const{
    cout<<"the object at address "<<this<<" has "<<"value "<<(*this).x<<endl;
}

int main(int argc, const char * argv[]) {
    // insert code here...
    example obj1(10),obj2(20);
    cout<<"address of objects are "<<&obj1<<" and "<<&obj2<<endl;
    obj1.printaddressandvalue();
    obj2.printaddressandvalue();
    return 0;
}

运行结果

address of objects are 0x7ffeefbff578 and 0x7ffeefbff570
the object at address 0x7ffeefbff578 has value 10
the object at address 0x7ffeefbff570 has value 20
program ended with exit code: 0