C / C++ / MFC

Stefan63 wrote:

1 Why do you not want to use extern?
2 Why do you want to create an instance of class TEST in A.cpp?
3 Do you know what a class is?
4 Why do you not provide a header for Sample.cpp?
5 How do you even call the functions in Sample.cpp when you don't have a header?
6 Have you actually successfully compiled the code you've written so far, or any part of it?
7 Did you actually create a project?

yogeshs wrote:

1. By using <layer>Extern makes the performance of my aplication low.

yogeshs wrote:

my project doesnt allow me to do other things

//In A.h
...
TEST *GetTestInstance();
...

//In A.cpp
...
TEST *GetTestInstance()
{
  return _pObj;
}

//In A.h
class TEST
{
  int  num;
  void fun();
public:
  static TEST *GetInstance();
};

//in A.cpp
...
TEST *TEST::GetInstance()
{
  return _pObj;
}