如下列代码所示的基类（base）及其派生类（derived），则生成一个派生类的对象时，只调用派生类的构造函数。

#include <iostream>

using namespace std;

class base {

public:

base() {

cout << "base constructor" << endl;

}

~base() {

cout << "base destructor" << endl;

}

};

class derived : public base {

public:

derived() {

cout << "derived constructor" << endl;

}

~derived() {

cout << "derived destructor" << endl;

}

};