use exception for GetMessage error

hw3d/WinMain.cpp

@@ -42,7 +42,7 @@ int CALLBACK WinMain(
 		// check if GetMessage call itself borked
 		if( gResult == -1 )
 		{
-			return -1;
+			throw CHWND_LAST_EXCEPT();
 		}
 
 		// wParam here is the value passed to PostQuitMessage

hw3d/Window.cpp

@@ -109,11 +109,11 @@ LRESULT CALLBACK Window::HandleMsgSetup( HWND hWnd,UINT msg,WPARAM wParam,LPARAM
 		// extract ptr to window class from creation data
 		const CREATESTRUCTW* const pCreate = reinterpret_cast<CREATESTRUCTW*>(lParam);
 		Window* const pWnd = static_cast<Window*>(pCreate->lpCreateParams);
-		// set WinAPI-managed user data to store ptr to window class
+		// set WinAPI-managed user data to store ptr to window instance
 		SetWindowLongPtr( hWnd,GWLP_USERDATA,reinterpret_cast<LONG_PTR>(pWnd) );
 		// set message proc to normal (non-setup) handler now that setup is finished
 		SetWindowLongPtr( hWnd,GWLP_WNDPROC,reinterpret_cast<LONG_PTR>(&Window::HandleMsgThunk) );
-		// forward message to window class handler
+		// forward message to window instance handler
 		return pWnd->HandleMsg( hWnd,msg,wParam,lParam );
 	}
 	// if we get a message before the WM_NCCREATE message, handle with default handler
@@ -122,9 +122,9 @@ LRESULT CALLBACK Window::HandleMsgSetup( HWND hWnd,UINT msg,WPARAM wParam,LPARAM
 
 LRESULT CALLBACK Window::HandleMsgThunk( HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam ) noexcept
 {
-	// retrieve ptr to window class
+	// retrieve ptr to window instance
 	Window* const pWnd = reinterpret_cast<Window*>(GetWindowLongPtr( hWnd,GWLP_USERDATA ));
-	// forward message to window class handler
+	// forward message to window instance handler
 	return pWnd->HandleMsg( hWnd,msg,wParam,lParam );
 }