14-25.txt

《C/C++完美演绎》源代码

/* 范例：14-25 */
#include <iostream.h>
class B
{
  public:
    int a;
    int b;
    B():a(10),b(20){}
};
class A
{
  public:
    int c;
    B *d;
    A():c(30),d(new B){}
    A(int x){}
    ~A(){delete d;}
};
void main()
{
  A *ptr;
  ptr = new A;
  A obj2(33);
  obj2 = *ptr;
  cout<<"delete前\n";
  cout<<"obj2.c="<<obj2.c<<"\tobj2.d->a="<<obj2.d->a \
    	<<"\tobj2.d->b="<<obj2.d->b<<endl;
  delete ptr;
  cout<<"delete后\n";
  cout<<"obj2.c="<<obj2.c<<"\tobj2.d->a="<<obj2.d->a \
    	<<"\tobj2.d->b="<<obj2.d->b<<endl;
  getchar();
}

程序执行结果：
delete前
obj2.c=30       obj2.d->a=10            obj2.d->b=20
delete后
obj2.c=30       obj2.d->a=6815944       obj2.d->b=6815944