C / C++ / MFC

mydll.h
#ifdef MY_DLL_NAME
  #define DLL_EXPORTS __declspec(dllexport)
#else
  #define DLL_EXPORTS __declspec(dllimport)
#endif

template<typename T>
class DLL_EXPORTS MyDllClass
{
 public:
  MyDllClass(){}
 public:
  ~MyDllClass(){}
};

myexe.h

#include "mydll.h" // Ensure linker can access mydll.lib and mydll.h

class MyExeClass
{
 public:
  MyExeClass(){}

 public:
  ~MyExeClass(){}

 public:
  VOID MyExeFunc()
  {
    MyDllClass<Someclass> var;  //  Remove DLL_EXPORTS to resolve LNK2019. 
  }
};

Is this behaviour expected? Is it documented?

CWnd * tempWnd = new CWnd(); //Create a new CWnd object
tempWnd->Attach(p_adsw_hwndAcad); //handle to the main window
CFPLvlLyrWnd *mWnd = (CFPLvlLyrWnd*)(RUNTIME_CLASS(CFPLvlLyrWnd))->CreateObject(); //CFPLvleLyrWnd is derived from CFrameWnd
RECT sizze = CFrameWnd::rectDefault;
DWORD dwStyle = WS_OVERLAPPEDWINDOW;
    //set up Window size
if (mWnd->Create(NULL, "Levels/Layers", dwStyle, sizze, tempWnd, MAKEINTRESOURCE(0) ))
{
        mWnd->m_parentWHandle = p_adsw_hwndAcad;
            tempWnd->BeginModalState();
    mWnd->ShowWindow(SW_SHOW);
}
else
{
    AfxMessageBox("LoadFrame failed!");
}
HWND tempHandle = tempWnd->Detach();

delete(tempWnd);