- inline bool operator == (const wxPen& pen) { return m_refData == pen.m_refData; }
- inline bool operator != (const wxPen& pen) { return m_refData != pen.m_refData; }
+ inline bool operator == (const wxPen& pen) const { return m_refData == pen.m_refData; }
+ inline bool operator != (const wxPen& pen) const { return m_refData != pen.m_refData; }