check for self assignment in operator=

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62762 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/any.h

@@ -663,7 +663,8 @@ public:
     */
     wxAny& operator=(const wxAny &any)
     {
-        AssignAny(any);
+        if (this != &any)
+            AssignAny(any);
         return *this;
     }
 

include/wx/osx/core/cfref.h

@@ -234,9 +234,12 @@ public:
     */
     wxCFRef& operator=(const wxCFRef& otherRef)
     {
-        wxCFRetain(otherRef.m_ptr);
-        wxCFRelease(m_ptr);
-        m_ptr = otherRef.m_ptr;
+        if (this != &otherRef)
+        {
+            wxCFRetain(otherRef.m_ptr);
+            wxCFRelease(m_ptr);
+            m_ptr = otherRef.m_ptr;
+        }
         return *this;
     }
 

include/wx/private/sckaddr.h

@@ -137,10 +137,11 @@ public:
 
     wxSockAddressImpl& operator=(const wxSockAddressImpl& other)
     {
-        free(m_addr);
-
-        InitFromOther(other);
-
+        if (this != &other)
+        {
+            free(m_addr);
+            InitFromOther(other);
+        }
         return *this;
     }