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!