Check for self-assignment in operator=

src/qt/bitmap.cpp

@@ -477,10 +477,13 @@ wxMask::wxMask(const wxMask &mask)
 }
 
 wxMask& wxMask::operator=(const wxMask &mask)
+{
+    if (this != &mask)
     {
         delete m_qtBitmap;
         QBitmap *mask_bmp = mask.GetHandle();
         m_qtBitmap = mask_bmp ? new QBitmap(*mask_bmp) : NULL;
+    }
     return *this;
 }
 

src/qt/region.cpp

@@ -350,11 +350,13 @@ wxRegionIterator::~wxRegionIterator()
 }
 
 wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
+{
+    if (this != &ri)
     {
         delete m_qtRects;
-
         m_qtRects = new QVector< QRect >( *ri.m_qtRects );
         m_pos = ri.m_pos;
+    }
     return *this;
 }