Regarding destruction

[mfdiqwer]

Please have a look at below sample code:

#include<iostream.h>
class Test
{
 public:
   void fun()
   {
       cout<<"In fun"<<endl;
   }
   Test()
   {
       cout<<"In const"<<endl;
   }
   ~Test()
   {
       cout<<"In dest"<<endl;
   }
};
int main()
{
    cout<<"Hello"<<endl;
    Test * t = new Test();
    t->fun();
    delete t;
    t->fun();
    return 0;
}

In above I created object "t" and destroyed using delete operator.
After destroying also I am able to call the function "fun".How it is possible
output of above code :
Hello
In const
In fun
In dest
In fun

If i am able to call the function , than what actually destruction will do ?