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

@@ -663,6 +663,7 @@ public:
     */
     wxAny& operator=(const wxAny &any)
     {
+        if (this != &any)
             AssignAny(any);
         return *this;
     }

include/wx/osx/core/cfref.h

@@ -233,10 +233,13 @@ public:
                     is made to point to the new pointer.
     */
     wxCFRef& operator=(const wxCFRef& otherRef)
+    {
+        if (this != &otherRef)
         {
             wxCFRetain(otherRef.m_ptr);
             wxCFRelease(m_ptr);
             m_ptr = otherRef.m_ptr;
+        }
         return *this;
     }
 

include/wx/private/sckaddr.h

@@ -136,11 +136,12 @@ public:
     }
 
     wxSockAddressImpl& operator=(const wxSockAddressImpl& other)
+    {
+        if (this != &other)
         {
             free(m_addr);
-
             InitFromOther(other);
-
+        }
         return *this;
     }