pass by reference, not value

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29436 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -101,7 +101,7 @@ WXDLLIMPEXP_BASE wxString wxGetDataDir();
 // Get the state of a key (true if pressed, false if not)
 // This is generally most useful getting the state of
 // the modifier or toggle keys.
-WXDLLEXPORT bool wxGetKeyState(wxKeyCode key);
+WXDLLEXPORT bool wxGetKeyState(const wxKeyCode& key);
 
 
 // Don't synthesize KeyUp events holding down a key and producing