求一个析构函数的例子;

[zhulinjia]

速度

[e_sharp]

class Base {
public:
~Base() {} //不明白lz什么意思
};

[coverallwangp]

class A
{
public:
A(){cout<<"A construction"<<endl;}
~A(){cout<<"A destruction"<<endl;}
};
class B
{
public:
B(){cout<<"B construction"<<endl;}
~B(){cout<<"B destruction"<<endl;}
A a;
};

main()
{
B b;
}
则其结果如下：A construction
B construction
B destruction
A destruction

[coverallwangp]

1. 分析一下这段程序的输出 (Autodesk)

class B

{

public:

     B()

     {

         cout<<"default constructor"<<endl;

     }



     ~B()

     {

         cout<<"destructed"<<endl;

     }



     B(int i) : data(i)     //B(int) works as a converter ( int -> instance of   B)

     {

         cout<<"constructed by parameter " << data <<endl;

     }



private:

     int data;

};



B Play( B b)

{

     return b ;

}



(1) results:

int main(int argc, char* argv[])     //constructed by parameter 5

{                                    //destructed   B(5)形参析构

     B t1 = Play(5); B t2 = Play(t1);    　 //destructed   t1形参析构

     return 0;　　　　　　　　　　　　　　 //destructed   t2　注意顺序！

}                                          //destructed   t1



(2) results:

int main(int argc, char* argv[])           //constructed by parameter 5

{                                          //destructed   B(5)形参析构

     B t1 = Play(5); B t2 = Play(10);       //constructed by parameter 10

     return 0;　　　　　　　　　　　　　　 //destructed   B(10)形参析构

}                                          //destructed   t2　注意顺序！

                                           //destructed   t1

[K行天下]

刚才看到 一贴

#include <iostream>
using namespace std;
class A
{
public:
~A(){cout <<"~A()";}
};
class B
{
public:
virtual ~B(){cout <<"~B()";}
};
class C:public A,public B
{
public:
~C(){cout <<"~C()";}
};
int main()
{
    C *c = new C;
    B *b1 = dynamic_cast <B*>(c);
    A *a2 = dynamic_cast <A*>(c);
    delete c;
    a2 = NULL;
    if (b1 == NULL)
    {
        cout <<"################" <<endl;
        return 1;
    }
    else
    {
        cout <<"@@@@@@@@@@@@@@" <<endl;
        return 0;

    }
}

[jieao111]

lz像皇帝似的

[大牛~Daniel]

不明白LZ的意思?
你是想知道析构函数怎么写么？
就是类名前加“~”
例如：
class A
{
public:
A{}//构造函数
~A{}//析构函数
}；

[richbirdandy]

[Quote=引用 5 楼 jieao111 的回复:]
lz像皇帝似的
[/Quote]
是啊 给200分再装皇帝

[Silitex]

啊~喍