在范围结束之前调用析构函数

时间:2013-04-24 17:04:45

标签: c++ destructor

由于某种原因,在main func。中创建一个对象后,析构函数会立即被调用,它是否应该仅在main完成时被调用?感谢

代码:

#include <iostream>
#include <cstring>
#include <vector>
using namespace std; 


class check{                                                   //create class check
public:
    string m_bank_name;
    int m_check_number;
    int m_branch_number;
    char* m_check_sum;



    check ( string bank_name, int check_number, int branch_number, char* check_sum){
        int a_size = (strlen(check_sum)+1);
        m_check_sum = new char[a_size]();
        for (int i=0;i<a_size;i++)
        {
            m_check_sum[i]=check_sum[i];
        }
        m_bank_name= bank_name;
        m_check_number = check_number;
        m_branch_number = branch_number;
    }

    ~check (){
        delete [] m_check_sum;
        cout<<"deleted!"<<endl;     
        }
};

void main(){

    check ob1= check("poalim",809877,12,"4578");
    cout<<ob1.m_check_sum<<endl;
    getchar();
}

1 个答案:

答案 0 :(得分:4)

此表达式

check("poalim",809877,12,"4578")

创建一个临时对象,在完整表达式(;)

之后立即被销毁

在被销毁之前,它被复制到ob1,它在主函数结束时被销毁。

也许你打算写

int main(){ //note the correct return type of main
  check ob1("poalim",809877,12,"4578"); //direct constructor call
  cout<<ob1.m_check_sum<<endl;
  getchar(); 
}

我真的建议您阅读good book on C++基础知识。