added IsEmpty

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18490 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/ctrlsub.h b/include/wx/ctrlsub.h
index 0b98232f3ded847aeafd3a8f2b064f508f194af3..93ed78cfdecb4287dd54a7a9dfa59c1ff3490a52 100644 (file)
--- a/include/wx/ctrlsub.h
+++ b/include/wx/ctrlsub.h
@@ -57,6 +57,8 @@ public:
     // -----------------
 
     virtual int GetCount() const = 0;
+    bool IsEmpty() const { return GetCount() == 0; }
+
     virtual wxString GetString(int n) const = 0;
     virtual void SetString(int n, const wxString& s) = 0;
     virtual int FindString(const wxString& s) const = 0;