《C++ 構造析構調用》派生類的構造函數和析構函數的調用順序

#include<iostream>
using namespace std;

class Base1
{
public:
	Base1(int x):m_x(x)
	{
		cout<<"create base1!"<<endl;
	}
	~Base1()
	{
		cout<<"Free Base1"<<endl;
	}
private:
	int m_x;
};
class Base2
{
public:
	Base2(int y):m_y(y)
	{
		cout<<"create base2!"<<endl;
	}
	~Base2()
	{
		cout<<"Free Base2"<<endl;
	}
private:
	int m_y;
};
class Base3
{
public:
	Base3(int z):m_z(z)
	{
		cout<<"create base3!"<<endl;
	}
	~Base3()
	{
		cout<<"Free Base3"<<endl;
	}
private:
	int m_z;
};

class D:public Base2,public Base1,public Base3//父類構造順序由這塊的聲明順序決定
{
	/*構造順序只和聲明順序有關*/
public:
	D(int data):Base1(data),Base2(data),Base3(data),b1(data),b2(data),b3(data)//在這塊的初始化順序和構造順序無關
	{
		cout<<"create D!"<<endl;
	}
	~D()
	{
		cout<<"Free D"<<endl;
	}
private:
	Base1 b1;
	Base2 b2;
	Base3 b3;
};

void main()
{
	D d(10);
}

/*
派生類構造函數各部分的執行次序爲：
1-調用基類構造函數，按它們在派生類定義的先後順序，順序調用
2-調用成員對象的構造函數，按它們在類定義中聲明的先後順序，順序調用
3-派生類的構造函數體中的操作
*/

/*

class Base
{
public:
	Base()
	{
		cout<<"create base!"<<endl;
	}
	~Base()
	{
		cout<<"Free Base"<<endl;
	}
private:
	int x;
};

class D:public Base
{
public:
	D()
	{
		cout<<"create D!"<<endl;
	}
	~D()
	{
		cout<<"Free D"<<endl;
	}
private:
	int y;
};

void main()
{
	D d;
	
}

*/