- bool operator == (const wxBitmap& bitmap) { return m_refData == bitmap.m_refData; }
- bool operator != (const wxBitmap& bitmap) { return m_refData != bitmap.m_refData; }
+ bool operator == (const wxBitmap& bitmap) const { return m_refData == bitmap.m_refData; }
+ bool operator != (const wxBitmap& bitmap) const { return m_refData != bitmap.m_refData; }