In depth analysis: do C++ templates make code bloated
- 2020-04-01 21:40:44
- OfStack
Today, I told my colleague that C++ templates would make the code swell up, but my colleague didn't think so.
Here's my colleague's argument: why use templates so much in ATL and WTL if they bloat your code? Similarly, the executables compiled by ATL and WTL are much smaller than those compiled by MFC.
For a moment, I wondered if it was true, as my colleague had said, that the idea that templates inflate code was wrong.
Because MFC itself is there in terms of code volume and complexity, it's fair to say that it generates large exes. We will focus here on why ATL/WTL USES templates but does not make the generated exe larger.
We know that with templates, multiple pieces of code are generated after different template real classes are generated from the same template, such as vector< Int> Vector< Char> Vector< Double> , a total of three different vectors will be generated, which is what we usually call code bloat.
So why doesn't ATL/WTL have a code bloat problem?
I here to ATL window code as an example to analyze this problem, because I am familiar with WinDbg, next I will use WinDbg as a tool to analyze my previous written that tetris program.
First let's take a look at the ATL window code:
template <class T, class TBase , class TWinTraits >
class ATL_NO_VTABLE CWindowImpl : public CWindowImplBaseT< TBase, TWinTraits >
{
public:
DECLARE_WND_CLASS(NULL)
static LPCTSTR GetWndCaption()
{
return NULL;
}
HWND Create(HWND hWndParent, _U_RECT rect = NULL, LPCTSTR szWindowName = NULL,
DWORD dwStyle = 0, DWORD dwExStyle = 0,
_U_MENUorID MenuOrID = 0U, LPVOID lpCreateParam = NULL)
{
if (T::GetWndClassInfo().m_lpszOrigName == NULL)
T::GetWndClassInfo().m_lpszOrigName = GetWndClassName();
ATOM atom = T::GetWndClassInfo().Register(&m_pfnSuperWindowProc);
dwStyle = T::GetWndStyle(dwStyle);
dwExStyle = T::GetWndExStyle(dwExStyle);
// set caption
if (szWindowName == NULL)
szWindowName = T::GetWndCaption();
return CWindowImplBaseT< TBase, TWinTraits >::Create(hWndParent, rect, szWindowName,
dwStyle, dwExStyle, MenuOrID, atom, lpCreateParam);
}
};
Above is a template class, it should generate multiple template instance code: we can use WinDbg symbol search command to do validation:
Input x HYTeris! ATL: : CWindowImpl< *, search all to HYTeris! ATL: : CWindowImpl< Opening symbol
0:000> x HYTeris!ATL::CWindowImpl<*
004592f0 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004343a0 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00437c90 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00430440 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> > (void)
0041c990 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
0044cf50 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
004539a0 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00435800 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00434640 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
00437440 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::GetWndCaption (void)
00436020 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00453f70 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00424e30 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
004338a0 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0041c4f0 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00441b50 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
004365f0 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00455120 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
0040ea20 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00453fa0 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
0041abc0 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00459c20 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0045f640 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004608a0 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndClassInfo (void)
0045fed0 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00433a70 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00437c60 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
0044fb70 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0041acf0 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00459510 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00437a90 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00430490 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::~CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> > (void)
00424de0 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00433ac0 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00433850 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00433b60 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00452050 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0044f8e0 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0044cec0 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
004340e0 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00433ef0 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
004348c0 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::~CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > (void)
004535b0 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
00454170 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00459c70 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00451ed0 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00451f20 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0045c4b0 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00436320 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004536a0 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004604a0 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::GetWndCaption (void)
0040eca0 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
0045ff90 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
00437cc0 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
004366e0 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
0045e620 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004608d0 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndCaption (void)
004520a0 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
0045d210 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > (void)
004d84a8 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d84b8 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d7970 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d7960 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d914c HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8dd0 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8b04 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d8b14 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8ae8 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e31b8 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004e2980 HYTeris!ATL::CWindowImpl<CTsMainDisplayPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d88c4 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8330 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d88f0 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d88e0 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d8a40 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e30f0 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d8a5c HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d8a6c HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004e21d0 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d8c70 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e2e78 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004e1f00 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> > `RTTI Type Descriptor' = <no type information>
004d9208 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d9218 HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004e1ad8 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d834c HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d835c HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8c9c HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8c8c HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d856c HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d855c HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e2bb8 HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d7fa0 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d7fb0 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d91ec HYTeris!ATL::CWindowImpl<CTsSingleControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e2048 HYTeris!ATL::CWindowImpl<CTsMainButtonPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d8174 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d8184 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Base Class Array' = <no type information>
004d8dfc HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8dec HYTeris!ATL::CWindowImpl<CTsMutiScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e2728 HYTeris!ATL::CWindowImpl<CTsKeyEdit,WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004e28c8 HYTeris!ATL::CWindowImpl<CTsNextElementContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d8fac HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8f9c HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d848c HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8f80 HYTeris!ATL::CWindowImpl<CTsButton,WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8158 HYTeris!ATL::CWindowImpl<CTsGameMainWnd,ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8540 HYTeris!ATL::CWindowImpl<CTsMainStatusPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d7944 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d7f84 HYTeris!ATL::CWindowImpl<CTsDisplayContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e2aa0 HYTeris!ATL::CWindowImpl<CTsSingleScoreContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d9168 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d9178 HYTeris!ATL::CWindowImpl<CTsSubControlContainer,ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004e1628 HYTeris!ATL::CWindowImpl<CTsAgentWindow,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004e2148 HYTeris!ATL::CWindowImpl<CTsMainControlPane,ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d95c4 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Base Class Array' = <no type information>
004d95b4 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e3400 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > `RTTI Type Descriptor' = <no type information>
004d9598 HYTeris!ATL::CWindowImpl<CTsUserListCtrl,WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
The above symbol can verify our conjecture of multiple instances.
As you can see, CWindowImpl is related to our window inheritance classes (T), window base classes (TBase), and window styles (TWinTraits), so there are a lot of them. So why is it that so many symbols, so much function code, the exe size is not stretched?
Because the CWindowImpl class function itself was small, we could see it from the amount of code in the function.
In the same way, we can continue to analyze CWindowImplBaseT
template <class TBase = CWindow, class TWinTraits = CControlWinTraits>
class ATL_NO_VTABLE CWindowImplBaseT : public CWindowImplRoot< TBase >
{
public:
WNDPROC m_pfnSuperWindowProc;
CWindowImplBaseT() : m_pfnSuperWindowProc(::DefWindowProc)
{}
static DWORD GetWndStyle(DWORD dwStyle)
{
return TWinTraits::GetWndStyle(dwStyle);
}
static DWORD GetWndExStyle(DWORD dwExStyle)
{
return TWinTraits::GetWndExStyle(dwExStyle);
}
virtual WNDPROC GetWindowProc()
{
return WindowProc;
}
static LRESULT CALLBACK StartWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
HWND Create(HWND hWndParent, _U_RECT rect, LPCTSTR szWindowName,
DWORD dwStyle, DWORD dwExStyle, _U_MENUorID MenuOrID, ATOM atom, LPVOID lpCreateParam = NULL);
BOOL DestroyWindow()
{
ATLASSERT(::IsWindow(m_hWnd));
return ::DestroyWindow(m_hWnd);
}
BOOL SubclassWindow(HWND hWnd);
HWND UnsubclassWindow(BOOL bForce = FALSE);
LRESULT DefWindowProc()
{
const _ATL_MSG* pMsg = m_pCurrentMsg;
LRESULT lRes = 0;
if (pMsg != NULL)
lRes = DefWindowProc(pMsg->message, pMsg->wParam, pMsg->lParam);
return lRes;
}
LRESULT DefWindowProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
#ifdef STRICT
return ::CallWindowProc(m_pfnSuperWindowProc, m_hWnd, uMsg, wParam, lParam);
#else
return ::CallWindowProc((FARPROC)m_pfnSuperWindowProc, m_hWnd, uMsg, wParam, lParam);
#endif
}
virtual void OnFinalMessage(HWND )
{
// override to do something, if needed
}
};
0:000> x HYTeris!ATL::CWindowImplBaseT<*
0040f170 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, unsigned short, void *)
0040ec20 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndStyle (unsigned long)
00435970 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::OnFinalMessage (struct HWND__ *)
004604d0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::GetWndStyle (unsigned long)
00434a10 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::~CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
0040ec60 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWndExStyle (unsigned long)
00461740 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::WindowProc (struct HWND__ *, unsigned int, unsigned int, long)
0044c040 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::WindowProc (struct HWND__ *, unsigned int, unsigned int, long)
004346e0 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::~CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
0041c440 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00435940 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::GetWindowProc (void)
00459580 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::GetWndExStyle (unsigned long)
00461950 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, unsigned short, void *)
004395b0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::StartWindowProc (struct HWND__ *, unsigned int, unsigned int, long)
00439ea0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::DefWindowProcW (unsigned int, unsigned int, long)
00461620 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::StartWindowProc (struct HWND__ *, unsigned int, unsigned int, long)
004596e0 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, unsigned short, void *)
0041ced0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::WindowProc (struct HWND__ *, unsigned int, unsigned int, long)
0044c370 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::UnsubclassWindow (int)
00460510 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::GetWndExStyle (unsigned long)
00457f70 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::WindowProc (struct HWND__ *, unsigned int, unsigned int, long)
0045f830 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::GetWindowProc (void)
00457820 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
004374b0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::GetWndExStyle (unsigned long)
00434ad0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::~CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > (void)
004595c0 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::StartWindowProc (struct HWND__ *, unsigned int, unsigned int, long)
004358f0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> > (void)
00445920 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::OnFinalMessage (struct HWND__ *)
00461ad0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::DefWindowProcW (unsigned int, unsigned int, long)
0041c4c0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::OnFinalMessage (struct HWND__ *)
00437470 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::GetWndStyle (unsigned long)
004398e0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::Create (struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, unsigned short, void *)
0040ed50 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::StartWindowProc (struct HWND__ *, unsigned int, unsigned int, long)
004458a0 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > (void)
0045f7e0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > (void)
0041ad30 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::~CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> > (void)
00430550 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::~CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> > (void)
0045f860 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::OnFinalMessage (struct HWND__ *)
004582a0 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::UnsubclassWindow (int)
0041c490 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::GetWindowProc (void)
0044cb50 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::DefWindowProcW (unsigned int, unsigned int, long)
0044c250 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::SubclassWindow (struct HWND__ *)
004458f0 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::GetWindowProc (void)
00459540 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::GetWndStyle (unsigned long)
00458180 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::SubclassWindow (struct HWND__ *)
00457870 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::GetWindowProc (void)
00457910 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::OnFinalMessage (struct HWND__ *)
0040e990 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::DestroyWindow (void)
004396d0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::WindowProc (struct HWND__ *, unsigned int, unsigned int, long)
0041d1c0 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::DefWindowProcW (unsigned int, unsigned int, long)
004578a0 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::DefWindowProcW (unsigned int, unsigned int, long)
004d8fc8 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8ff4 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8fe4 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d79b4 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d79a4 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e2798 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d819c HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d8938 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Array' = <no type information>
004d8928 HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d960c HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Base Class Array' = <no type information>
004d95fc HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e2ee8 HYTeris!ATL::CWindowImplBaseT<WTL::CButtonT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d81c8 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Base Class Array' = <no type information>
004d81b8 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004e34a0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > > `RTTI Type Descriptor' = <no type information>
004d95e0 HYTeris!ATL::CWindowImplBaseT<WTL::CListViewCtrlT<ATL::CWindow>,ATL::CWinTraitsOR<32777,0,ATL::CWinTraits<1442840576,0> > >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e1f68 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<114229248,262400> > `RTTI Type Descriptor' = <no type information>
004e1688 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> > `RTTI Type Descriptor' = <no type information>
004d7988 HYTeris!ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d890c HYTeris!ATL::CWindowImplBaseT<WTL::CEditT<ATL::CWindow>,ATL::CWinTraits<1442840576,0> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
You can see that CWindowImplBaseT is only related to the window base class and window style, the number has been reduced a lot, the CWindowImplBaseT template class itself function number is not much, the size of the function code is not much.
Then let's look at CWindowImplRoot,
template <class TBase >
class ATL_NO_VTABLE CWindowImplRoot : public TBase, public CMessageMap
{
public:
CWndProcThunk m_thunk;
const _ATL_MSG* m_pCurrentMsg;
DWORD m_dwState;
enum { WINSTATE_DESTROYED = 0x00000001 };
// Constructor/destructor
CWindowImplRoot() : m_pCurrentMsg(NULL), m_dwState(0)
{ }
virtual ~CWindowImplRoot()
{
#ifdef _DEBUG
if(m_hWnd != NULL) // should be cleared in WindowProc
{
ATLTRACE(atlTraceWindowing, 0, _T("ERROR - Object deleted before window was destroyedn"));
ATLASSERT(FALSE);
}
#endif //_DEBUG
}
// Current message
const _ATL_MSG* GetCurrentMessage() const
{
return m_pCurrentMsg;
}
// "handled" management for cracked handlers
BOOL IsMsgHandled() const
{
const _ATL_MSG* pMsg = GetCurrentMessage();
ATLASSERT(pMsg != NULL);
ATLASSERT(pMsg->cbSize >= sizeof(_ATL_MSG));
return pMsg->bHandled;
}
void SetMsgHandled(BOOL bHandled)
{
_ATL_MSG* pMsg = (_ATL_MSG*)GetCurrentMessage(); // override const
ATLASSERT(pMsg != NULL);
ATLASSERT(pMsg->cbSize >= sizeof(_ATL_MSG));
pMsg->bHandled = bHandled;
}
// Message forwarding and reflection support
LRESULT ForwardNotifications(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
LRESULT ReflectNotifications(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
static BOOL DefaultReflectionHandler(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult);
};
0:000> x HYTeris!ATL::CWindowImplRoot*
004364d0 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> >::~CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> > (void)
004367d0 HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> >::~CWindowImplRoot<WTL::CEditT<ATL::CWindow> > (void)
00457c30 HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> >::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> > (void)
00460550 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> >::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> > (void)
004479d0 HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> >::CWindowImplRoot<WTL::CEditT<ATL::CWindow> > (void)
0041c360 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::~CWindowImplRoot<ATL::CWindow> (void)
00435f40 HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> >::~CWindowImplRoot<WTL::CButtonT<ATL::CWindow> > (void)
004613f0 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::ForwardNotifications (unsigned int, unsigned int, long, int *)
00438f50 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::ReflectNotifications (unsigned int, unsigned int, long, int *)
0041c8e0 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::CWindowImplRoot<ATL::CWindow> (void)
004e2800 HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> > `RTTI Type Descriptor' = <no type information>
004d897c HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> >::`RTTI Base Class Array' = <no type information>
004d896c HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d9640 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d9650 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> >::`RTTI Base Class Array' = <no type information>
004d8950 HYTeris!ATL::CWindowImplRoot<WTL::CEditT<ATL::CWindow> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d9028 HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> >::`RTTI Class Hierarchy Descriptor' = <no type information>
004d9038 HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> >::`RTTI Base Class Array' = <no type information>
004e16dc HYTeris!ATL::CWindowImplRoot<ATL::CWindow> `RTTI Type Descriptor' = <no type information>
004e3530 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> > `RTTI Type Descriptor' = <no type information>
004d9624 HYTeris!ATL::CWindowImplRoot<WTL::CListViewCtrlT<ATL::CWindow> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d79c8 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004e2f58 HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> > `RTTI Type Descriptor' = <no type information>
004d79f4 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::`RTTI Base Class Array' = <no type information>
004d79e4 HYTeris!ATL::CWindowImplRoot<ATL::CWindow>::`RTTI Class Hierarchy Descriptor' = <no type information>
004d900c HYTeris!ATL::CWindowImplRoot<WTL::CButtonT<ATL::CWindow> >::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
You can see that CWindowImplRoot is only related to the window base class (CWindow), so there are even fewer symbols associated.
Finally, let's look at CWindow:
0:000> x HYTeris!ATL::CWindow::*
004e1000 HYTeris!ATL::CWindow::rcDefault = struct tagRECT
00442a20 HYTeris!ATL::CWindow::DestroyWindow (void)
00425730 HYTeris!ATL::CWindow::InvalidateRect (struct tagRECT *, int)
00442340 HYTeris!ATL::CWindow::CenterWindow (struct HWND__ *)
00425850 HYTeris!ATL::CWindow::UpdateWindow (void)
0041c950 HYTeris!ATL::CWindow::CWindow (struct HWND__ *)
004391e0 HYTeris!ATL::CWindow::GetDlgItem (int)
004568a0 HYTeris!ATL::CWindow::SetWindowRgn (struct HRGN__ *, int)
00441d20 HYTeris!ATL::CWindow::GetWindowLongW (int)
00444350 HYTeris!ATL::CWindow::Create (wchar_t *, struct HWND__ *, class ATL::_U_RECT, wchar_t *, unsigned long, unsigned long, class ATL::_U_MENUorID, void *)
004391b0 HYTeris!ATL::CWindow::operator HWND__ * (void)
00459080 HYTeris!ATL::CWindow::EnableWindow (int)
00425140 HYTeris!ATL::CWindow::GetClientRect (struct tagRECT *)
00430c70 HYTeris!ATL::CWindow::SetWindowTextW (wchar_t *)
0040eb30 HYTeris!ATL::CWindow::GetWndClassName (void)
00456770 HYTeris!ATL::CWindow::MoveWindow (int, int, int, int, int)
00442ac0 HYTeris!ATL::CWindow::KillTimer (unsigned int)
00455fc0 HYTeris!ATL::CWindow::GetWindowTextW (wchar_t *, int)
0040ba20 HYTeris!ATL::CWindow::IsWindow (void)
00441db0 HYTeris!ATL::CWindow::GetParent (void)
004315b0 HYTeris!ATL::CWindow::SetWindowPos (struct HWND__ *, int, int, int, int, unsigned int)
00456810 HYTeris!ATL::CWindow::GetWindowRect (struct tagRECT *)
00431860 HYTeris!ATL::CWindow::GetStyle (void)
00455250 HYTeris!ATL::CWindow::Invalidate (int)
004318f0 HYTeris!ATL::CWindow::SetCapture (void)
00442cf0 HYTeris!ATL::CWindow::SetTimer (unsigned int, unsigned int, <function> *)
00431980 HYTeris!ATL::CWindow::ModifyStyle (unsigned long, unsigned long, unsigned int)
00443d10 HYTeris!ATL::CWindow::GetDlgItemTextW (int, wchar_t *, int)
0040b980 HYTeris!ATL::CWindow::SendMessageW (unsigned int, unsigned int, long)
00434be0 HYTeris!ATL::CWindow::ShowWindow (int)
004d7a38 HYTeris!ATL::CWindow::`RTTI Base Class Descriptor at (0,-1,0,64)' = <no type information>
004d7a04 HYTeris!ATL::CWindow::`RTTI Base Class Descriptor at (4,-1,0,64)' = <no type information>
004d7a20 HYTeris!ATL::CWindow::`RTTI Class Hierarchy Descriptor' = <no type information>
004d7a30 HYTeris!ATL::CWindow::`RTTI Base Class Array' = <no type information>
We see that there is only one copy of CWindow, and the number of functions is much less than atlwin.h, because ATL is provided in source code, and all unused functions will not be compiled into our final executable.
Through the above analysis, we believe that we know why ATL/WTL heavily USES templates, but the generated exe is still so small:
It's not that templates don't cause code bloat, but ATL/WTL was designed with this in mind. It avoids writing a lot of code in a template class that might generate a lot of template instances.
In summary, if you want to use a template but don't want your final executable to be too big,
There are two ways:
(1) your template class won't generate many template instances. Does it make sense to write a template class like this?
(2) the amount of code or the number of functions of your template class is very small, you can imitate the way of ATL template irrelevant things in the way of inheritance layer by layer, to ensure that the template class code is related to template parameters.