/*向上類型轉(zhuǎn)換和拷貝構造函數(shù)拷貝構造函數(shù)拷貝構造函數(shù)
如果允許便以其為派生類生成拷貝構造函數(shù)，
它將首先自動調(diào)用基類的拷貝構造函數(shù)，
然后再是各成員對象的拷貝構造函數(shù)
*/
#include <iostream>
using namespace std;

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class Parent{
int i;
public:
Parent(int ii):i(ii){
cout << "Parent(int ii)\n";
}
Parent(const Parent& b):i(b.i){
cout << "Parent(const Parent&)\n";
}
Parent():i(0){cout << "Parent()\n";}
friend ostream& operator<<(ostream& os,const Parent& b){
return os << "Parent: " << b.i << endl;
}
};

class Member{
int i;
public:
Member(int ii):i(ii){
cout << "Member(int ii)\n";
}
Member(const Member& m):i(m.i){
cout << "Member(const Member&)\n";
}
friend ostream& operator<<(ostream& os,const Member& m){
return os << "Member: " << m.i << endl;
}
};
class Child:public Parent{
int i;
Member m;
public:
Child(int ii):Parent(ii),i(ii),m(ii){
cout << "Child(int ii)\n";
}
Child(const Child& c):Parent(c),i(c.i),m(c.m){//無論何時我們在創(chuàng)建自己的拷貝構造函數(shù)時，都要正確地調(diào)用基類拷貝構造函數(shù)
cout << "Child(Child&)\n";
}
friend ostream& operator<<(ostream& os,const Child& c){
return os << (Parent&)c << c.m
<< "Child: " << c.i << endl;
}
};

int main(){
Child c(2);
cout << "calling copy-constructor: " << endl;
Child c2 = c;
cout << "Values in c2:\n" << c2;
return 0;
}

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轉(zhuǎn)載于:https://www.cnblogs.com/phoenixzq/archive/2010/11/17/1880128.html

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