派生类构造函数调用基类构造函数

[gxj714]

#include "StdAfx.h"
#include<iostream>
using namespace std;



class rootClass {
public: int rpub_data;
//rootClass():rpub_data(0),rpri_data(0),rpro_data(0){}
rootClass(int aa=2,int bb=2,int cc=2){
rpub_data=aa;
rpri_data=bb;
rpro_data=cc;
}
void show_r_data(){
cout<<"public data: "<<rpub_data<<endl;
cout<<"private data: "<<rpri_data<<endl;
cout<<"protected data: "<<rpro_data<<endl;
}
void set_r_data(int aa,int bb,int cc){
rpub_data=aa;
rpri_data=bb;
rpro_data=cc;
}
private:
int rpri_data;
protected:
int rpro_data;
};

//define the children class

class childrenClass:public rootClass{
public:
childrenClass(){}
childrenClass(int para1,int para2,int para3){
rootClass( para1, para2, para3);
}
void show_children_data(){
show_r_data();
}
void set_children_data(int aa,int bb,int cc){
set_r_data(aa,bb,cc);
}
};


void main()
{
childrenClass init;
cout<<"init's public data: "<<init.rpub_data<<endl;
cout<<"use rootclass's method to show all the data: ";
init.show_r_data();
cout<<"use init's own method to show all the data: ";
init.show_children_data();
childrenClass afterinit(1,2,3);
//afterinit.set_children_data(1,2,3);
afterinit.show_children_data();
}

为什么afterinit的输出还是2,2,2，而不是1,2,3？

[pengzhixi]

childrenClass(int para1,int para2,int para3){
rootClass( para1, para2, para3);
}
你这里构造的是一个临时对象，而不是初始化基类部分。google"初始化列表"

[hen_hao_ji]

class childrenClass:public rootClass
{
public:
	childrenClass(){}
	// 这样才是初始化基类
	childrenClass(int para1,int para2,int para3):rootClass( para1, para2, para3)
	{

	}
	void show_children_data(){
		show_r_data();
	}
	void set_children_data(int aa,int bb,int cc){
		set_r_data(aa,bb,cc);
	}
};

[cbzjzsb123]

[Quote=引用 2 楼 的回复:]
C/C++ code


class childrenClass:public rootClass
{
public:
childrenClass(){}
// 这样才是初始化基类
childrenClass(int para1,int para2,int para3):rootClass( para1, para2, para3)
{

……
[/Quote]+

[gxj714]

[Quote=引用 1 楼 的回复:]

childrenClass(int para1,int para2,int para3){
rootClass( para1, para2, para3);
}
你这里构造的是一个临时对象，而不是初始化基类部分。google"初始化列表"
[/Quote]
谢谢！

#include "StdAfx.h"
#include<iostream>
using namespace std;



class rootClass {
public: int rpub_data;
		//rootClass():rpub_data(0),rpri_data(0),rpro_data(0){}
		rootClass(int aa,int bb,int cc){
			rpub_data=aa;
			rpri_data=bb;
			rpro_data=cc;
		}
		void show_r_data(){
			cout<<"public data: "<<rpub_data<<endl;
			cout<<"private data: "<<rpri_data<<endl;
			cout<<"protected data: "<<rpro_data<<endl;
		}
		void set_r_data(int aa,int bb,int cc){
			rpub_data=aa;
			rpri_data=bb;
			rpro_data=cc;
		}
private:
	int rpri_data;
protected:
	int rpro_data;
};

//define the children class

class childrenClass:public rootClass{
public:
	
	childrenClass(int para1,int para2,int para3){
		rootClass( para1, para2, para3);
	}
	void show_children_data(){
		show_r_data();
	}
	void set_children_data(int aa,int bb,int cc){
		set_r_data(aa,bb,cc);
	}
};


void main()
{
	childrenClass init(1,2,3);
	cout<<"init's public data: "<<init.rpub_data<<endl;
	cout<<"use rootclass's method to show all the data: ";
	init.show_r_data();
	cout<<"use init's own method to show all the data: ";
	init.show_children_data();
	
}

一开始我是这样的代码，结果编译提示rootclass没有合适的构造函数，这是为什么呢？
在网上看到一个文章说派生类构造函数调用的顺序问题，他这么说：http://blog.163.com/chen_dawn/blog/static/112506320116741519305
我想我这个代码的错误是不是验证了他的话？

[gxj714]

[Quote=引用 2 楼 的回复:]

C/C++ code

class childrenClass:public rootClass
{
public:
childrenClass(){}
// 这样才是初始化基类
childrenClass(int para1,int para2,int para3):rootClass( para1, para2, para3)
{

}
vo……
[/Quote]
呵呵，谢谢！麻烦看看我的回复，继续请教。

[siceblue]

[Quote=引用 2 楼 的回复:]

C/C++ code

class childrenClass:public rootClass
{
public:
childrenClass(){}
// 这样才是初始化基类
childrenClass(int para1,int para2,int para3):rootClass( para1, para2, para3)
{

}
vo……
[/Quote]

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