Add check for self assignment to the = operator

git-svn-id: http://svn.osgeo.org/qgis/trunk@5100 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: gsherman

src/core/qgsgeometryvertexindex.cpp

@@ -30,7 +30,10 @@ QgsGeometryVertexIndex::QgsGeometryVertexIndex( QgsGeometryVertexIndex const & r
 
 QgsGeometryVertexIndex & QgsGeometryVertexIndex::operator=( QgsGeometryVertexIndex const & rhs )
 {
-  mIndex = rhs.mIndex;
+  if(&rhs != this)
+  {
+    mIndex = rhs.mIndex;
+  }
   return *this;
 }