用子类对象初始化的多态基类对象数组

Sorry for the complicated title. I have something like this:

class Base
{
public:
  int SomeMember;
  Base() : SomeMember(42) {}
  virtual int Get() { return SomeMember; }
};

class ChildA : public Base
{
public:
  virtual int Get() { return SomeMember*2; }
};

class ChildB : public Base
{
public:
  virtual int Get() { return SomeMember/2; }
};

class ChildC : public Base
{
public:
  virtual int Get() { return SomeMember+2; }
};

Base ar[] = { ChildA(), ChildB(), ChildC() };

for (int i=0; i<sizeof(ar)/sizeof(Base); i++)
{
  Base* ptr = &ar[i];
  printf("El %i: %i
", i, ptr->Get());
}

哪些输出:

El 0: 42
El 1: 42
El 2: 42

这是正确的行为吗(在 VC++ 2005 中)?老实说，我希望这段代码不会编译，但它确实编译了，但是它没有给我我需要的结果.这有可能吗?

Base ar[] = { ChildA(), ChildB(), ChildC() };