C++Builder中__closure关键字的用法

最近在用C++Builder时，想要将对象1的成员函数指针赋给对象2的成员变量，然后在对象2内通过该成员变量访问对象1的成员函数。貌似标准的C++不支持这样的操作，但是C++Builder提供了__closure关键字，感觉还挺好用的，测试代码如下：

// Unit1.h
//---------------------------------------------------------------------------
class Test1 {
private:
  int m_Add;

public:
  __fastcall Test1(int Add) {
    m_Add = Add;
  };
  virtual __fastcall ~Test1() {};

  int __fastcall TestFunction1(int param1);
  void __fastcall Test11();
};

//---------------------------------------------------------------------------
class Test2 {
public:
  __fastcall Test2() {};
  virtual __fastcall ~Test2() {};

  int __fastcall(__closure *TestFunction2)(int param1);
  void __fastcall Test22();
};

// Unit1.cpp
//---------------------------------------------------------------------------
int __fastcall Test1::TestFunction1(int param1) {
  return param1 + m_Add;
}

//---------------------------------------------------------------------------
void __fastcall Test1::Test11() {
  Test2 *test2 = new Test2();
  test2->TestFunction2 = &TestFunction1;
  test2->Test22();
  delete test2;
};

//---------------------------------------------------------------------------
void __fastcall Test2::Test22() {
  printf("Result: %d", TestFunction2(1));
}

// main.cpp
//---------------------------------------------------------------------------
int _tmain(int argc, _TCHAR* argv[]) {
  Test1 *test = new Test1(1);
  test->Test11();
  delete test;
  getchar();
  return 0;
}