星期四, 5月 03, 2007
星期三, 5月 02, 2007
C++ destructor與virtual destructor
非virtual destructor
class Base{
public: ~Base(){ cout << "base destructor" << endl; }
};class Derived: public Base{
public: ~Derived(){ cout << "derived constructor" << endl; }
};void main (int argc, _TCHAR* argv[])
{
{
Derived d;
}
cout << "=========" << endl;
Base *b = new Derived;
delete b;
}
執行結果
derived constructor
base destructor
=========
base destructor
virtual destructor
class Base{
public: virtual ~Base(){ cout << "base destructor" << endl; }
};class Derived: public Base{
public: ~Derived(){ cout << "derived constructor" << endl; }
};void main (int argc, _TCHAR* argv[])
{
{
Derived d;
}
cout << "=========" << endl;
Base *b = new Derived;
delete b;
}
執行結果
derived constructor
base destructor
=========
derived constructor
base destructor