this指针的补充
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1、单击此处编辑母版标题样式,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,x, y ;,,public :,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,se
2、tXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{,Poin
3、t,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,void,setXY,(,
4、double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj
5、1.y,obj2.x,obj2.y,obj3.x,obj3.y,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,
6、printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,向哪个对象,,的数据成员赋值？,,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x = a ; y = b ;
7、},,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,void,se
8、tXY,(,double,a,,double,b,,Point,* const this,) { this->x = a ; this->y = b ; },obj1 .,setXY,( 10, 15,,&obj1,) ;,成员函数隐含定义,this,,指针,,接受调用对象的地址,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<<
9、x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,obj1 .,setXY,( 10, 15,,&obj1,) ;,thi
10、s,,指针不能显式声明,,,void,setXY,(,double,a,,double,b,,Point,* const this,) { this->x = a ; this->y = b ; },,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void m
11、ain(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,obj1 .,setXY,( 10, 15,,&obj1,) ;,this,,指针不能显式声明,,可以显式使用,void,setXY,(,double,a
12、,,double b,,,Point,* const this,) { this->x = a ; this->y = b ; },,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,
13、,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},,,obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,通过调用函数的对象,,this,指针获取对象地址,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,se
14、tXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,1
15、5,obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,obj1 .,setXY,( 10, 15 )
16、;,,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,15,obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,x, y ;,,public :,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,
17、,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,obj1 .,setXY,( 10, 15 ) ;,,,obj1 .,printXY,() ;,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,15,obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,在,o
18、bj1,上操作,10 , 15,,,20 , 25,,30 , 35,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,x, y ;,,public :,,void,setXY,(,double,a,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{Point,obj1, obj2, obj3 ;,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,p
19、rintXY,() ;,,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,15,obj1.x,obj1.y,obj2.x,obj2.y,obj3.x,obj3.y,10 , 15,,,20 , 25,,30 , 35,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double,a,,double,b) { x
20、 = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{,Point,obj1, obj2, obj3 ;,,obj1 .,setXY,( 10, 15 ) ;,,obj1 .,printXY,() ;,,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,15,obj1.x,obj1.y,obj2.x,obj2.
21、y,obj3.x,obj3.y,10 , 15,,,20 , 25,,30 , 35,在,obj2,上操作,,this,指针,,#include<,iostream.h,>,,class,Point,,{,double,,x,, y ;,,public :,,,void,setXY,(,double a,,,double,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,} ;,,void main(),,{,Point,obj1, obj2, obj3 ;,,obj1 .,setX
22、Y,( 10, 15 ) ;,,obj1 .,printXY,() ;,,,obj2 .,setXY,( 20, 25 ) ;,,obj2 .,printXY,() ;,,obj3 .,setXY,( 30, 35 ) ;,,obj3 .,printXY,() ;,,},10,15,obj1.x,obj1.y,20,25,obj2.x,obj2.y,obj3.x,obj3.y,10 , 15,,,20 , 25,,30 , 35,在,obj2,上操作,,this,指针,,#include<,iostream.h,>,,class Simple,,{,int,x, y ;,,public :,
23、,void,setXY,(,int,a,,int,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,,,void,constFun,( ),,{ x ++ ; y ++ ; },} ;,,this,指针,,#include<,iostream.h,>,,class Simple,,{,int,x, y ;,,public :,,void,setXY,(,int,a,,int,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x <<
24、 "," << y <<,endl,; } ;,,,,void,constFun,( ),,{,x ++ ; y ++ ;,},} ;,正确,,this,指针,,#include<,iostream.h,>,,class Simple,,{,int,x, y ;,,public :,,void,setXY,(,int,a,,int,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,,,void,constFun,( ),,{ x ++ ; y ++ ; },} ;,const,,th
25、is,指针,,#include<,iostream.h,>,,class Simple,,{,int,x, y ;,,public :,,void,setXY,(,int,a,,int,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,,,void,constFun,( ),const,,{,x ++,;,y ++,; },} ;,,void,constFun,(,const,Simple * const this,),错误,,不能修改对象的数据成员,this,指针,,是指向常量的常指针,,this,指针,,#include<,iostream.h,>,,class Simple,,{,int,x, y ;,,public :,,void,setXY,(,int,a,,int,b) { x = a ; y = b ; },,void,printXY,() {,cout,<< x << "," << y <<,endl,; } ;,,,,void,constFun,( ),,{,x ++,;,y ++,; },} ;,,
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