C++中虚继承的构造(construct)和析构(destruct)顺序

虚继承(virtual inheritance)的构造(construct)和析构(destruct)顺序

在多重继承的时候, 构造顺序是 虚继承按顺序优先, 再次是其他按顺序, 由基类至派生类; 析构顺序正好相反;

代码如下:

/*
 * cppprimer.cpp
 *
 *  Created on: 2014.1.10
 *      Author: Spike
 */

/*eclipse cdt, gcc 4.8.1*/

#include <iostream>
#include <string>  

class ZooAnimal {
public:
    ZooAnimal () {
        std::cout << "ZooAnimal Constructor!" << std::endl;
    }
    void zooprint (void) { std::cout << "Zoo Animal!" << std::endl; }
};  

class Bear : public virtual  ZooAnimal {
public:
    Bear (){
        std::cout << "Bear Constructor!" << std::endl;
    }
    void bearprint (void) { std::cout << "Bear!" << std::endl; }
};  

class Character {
public:
    Character () {
        std::cout << "Character Constructor!" << std::endl;
    }
};  

class BookCharacter : public Character {
public:
    BookCharacter () {
        std::cout << "BookCharacter Constructor!" << std::endl;
    }
};  

class ToyAnimal {
public:
    ToyAnimal () {
        std::cout << "ToyAnimal Constructor!" << std::endl;
    }
};  

class TeddyBear : public BookCharacter, public Bear,
                                public virtual ToyAnimal
{
public:
    TeddyBear () {
        std::cout << "TeddyBear Constructor!" << std::endl;
    }
};  

int main (void)
{
    TeddyBear TB;
}

输出:

ZooAnimal Constructor!
ToyAnimal Constructor!
Character Constructor!
BookCharacter Constructor!
Bear Constructor!
TeddyBear Constructor!

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