异常处理深度解析

Posted 2021-10-08 学习只为旅行

#include <iostream>
#include <cstdlib>
#include <exception>

using namespace std;

void my_terminate()
{
    cout << "void my_terminate()" << endl;
    exit(1);//结束当前函数
}

class Test 
{
public:
    Test() 
    {
        cout << "Test()"; 
        cout << endl;
    }
	
    ~Test() 
    {
        cout << "~Test()"; 
        cout << endl;
    }
};


int main()
{
    set_terminate(my_terminate);//设置异常处理函数
    
    static Test t;
    
    throw 1;
	
    return 0;
}

打印：
Test()
void my_terminate()
~Test()

#include <iostream>
#include <cstdlib>
#include <exception>

using namespace std;

void my_terminate()
{
    cout << "void my_terminate()" << endl;
    exit(1);
    //abort();//C++编译器默认是调用这个函数，直接强制结束程序，防止析构函数还会抛异常
    //my_terminate()被调用两次,资源被释放两次，很危险
}

class Test 
{
public:
    Test() 
    {
        cout << "Test()"; 
        cout << endl;
    }
	
    ~Test() 
    {
        cout << "~Test()"; 
        cout << endl;
        
        throw 2;
    }
};

int main()
{
    set_terminate(my_terminate);
    
    static Test t;
    
    throw 1;
	
    return 0;
}

应该将exit注释掉，使用abort函数

小结