X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5eb16fe200346c41de14bff0fc84128faaec5496..438959cca892a7651634cc3a7aad4819ac49b23c:/include/wx/gbsizer.h

diff --git a/include/wx/gbsizer.h b/include/wx/gbsizer.h
index 9ee4d48635..d9120a607b 100644
--- a/include/wx/gbsizer.h
+++ b/include/wx/gbsizer.h
@@ -67,6 +67,14 @@ public:
 
     // default copy ctor and assignment operator are okay.
 
+    // Factor constructor creating an invalid wxGBSpan: this is mostly supposed
+    // to be used as return value for functions returning wxGBSpan in case of
+    // errors.
+    static wxGBSpan Invalid()
+    {
+        return wxGBSpan(NULL);
+    }
+
     int GetRowspan() const { return m_rowspan; }
     int GetColspan() const { return m_colspan; }
     void SetRowspan(int rowspan)
@@ -87,6 +95,13 @@ public:
     bool operator!=(const wxGBSpan& o) const { return !(*this == o); }
 
 private:
+    // This private ctor is used by Invalid() only.
+    wxGBSpan(struct InvalidCtorTag*)
+    {
+        m_rowspan =
+        m_colspan = -1;
+    }
+
     void Init()
     {
         m_rowspan =