Fix wxHtmlHelpData::SetTempDir() to behave correctly without trailing slash.

[wxWidgets.git] / src / common / object.cpp

diff --git a/src/common/object.cpp b/src/common/object.cpp
index 734a4d50858720ac34a8d629353dd0d8e905251d..b1137974733b4a2ff07f00e4a6294a372337fc3b 100644 (file)
--- a/src/common/object.cpp
+++ b/src/common/object.cpp
@@ -1,366 +1,429 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        object.cpp
+// Name:        src/common/object.cpp

 // Purpose:     wxObject implementation
 // Author:      Julian Smart
 // Purpose:     wxObject implementation
 // Author:      Julian Smart

-// Modified by:
+// Modified by: Ron Lee

 // Created:     04/01/98
 // Created:     04/01/98

-// RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart and Markus Holzem
-// Licence:     wxWindows license
+// Copyright:   (c) 1998 Julian Smart
+//              (c) 2001 Ron Lee <ron@debian.org>
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "object.h"
-#endif
-

 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #ifndef WX_PRECOMP
 #endif
 
 #ifndef WX_PRECOMP

+    #include "wx/object.h"

     #include "wx/hash.h"
     #include "wx/hash.h"

-    #if wxUSE_SERIAL
-        #include "wx/objstrm.h"
-        #include "wx/serbase.h"
-
-        // for error messages
-        #include "wx/log.h"
-        #include "wx/intl.h"
-    #endif // wxUSE_SERIAL
-#endif // WX_PRECOMP
+    #include "wx/memory.h"
+    #include "wx/crt.h"
+#endif

 
 #include <string.h>
 
 #include <string.h>

-#include <assert.h>

 
 

-#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
-#include "wx/memory.h"
+#if wxUSE_DEBUG_CONTEXT
+    #if defined(__VISAGECPP__)
+        #define DEBUG_PRINTF(NAME) { static int raz=0; \
+            printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
+    #else
+        #define DEBUG_PRINTF(NAME)
+    #endif
+#endif // wxUSE_DEBUG_CONTEXT
+
+// we must disable optimizations for VC.NET because otherwise its too eager
+// linker discards wxClassInfo objects in release build thus breaking many,
+// many things
+#if defined __VISUALC__ && __VISUALC__ >= 1300
+    #pragma optimize("", off)

 #endif
 
 #endif
 

-#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
-    // for wxObject::Dump
-    #include "wx/ioswrap.h"
-#endif
+#if wxUSE_EXTENDED_RTTI
+const wxClassInfo* wxObject::ms_classParents[] = { NULL } ;
+wxObject* wxVariantOfPtrToObjectConverterwxObject ( const wxAny &data )
+{ return wxANY_AS(data, wxObject*); }
+ wxAny wxObjectToVariantConverterwxObject ( wxObject *data )
+ { return wxAny( dynamic_cast<wxObject*> (data)  ) ; }

 
 

-#if !USE_SHARED_LIBRARY
-wxClassInfo wxObject::sm_classwxObject((char *) "wxObject", (char *) NULL, (char *) NULL, (int ) sizeof(wxObject), (wxObjectConstructorFn) NULL);
-wxClassInfo* wxClassInfo::sm_first = (wxClassInfo *) NULL;
-wxHashTable* wxClassInfo::sm_classTable = (wxHashTable*) NULL;
-#endif
+ wxClassInfo wxObject::ms_classInfo(ms_classParents , wxEmptyString , wxT("wxObject"),
+            (int) sizeof(wxObject),                              \
+            (wxObjectConstructorFn) 0   ,
+            NULL,NULL,0 , 0 ,
+            0 , wxVariantOfPtrToObjectConverterwxObject , 0 , wxObjectToVariantConverterwxObject);

 
 

-/*
- * wxWindows root object.
- */
+ template<> void wxStringWriteValue(wxString & , wxObject* const & ){ wxFAIL_MSG("unreachable"); }
+ template<> void wxStringWriteValue(wxString & , wxObject const & ){ wxFAIL_MSG("unreachable"); }

 
 

-wxObject::wxObject(void)
-{
-  m_refData = (wxObjectRefData *) NULL;
-#if wxUSE_SERIAL
-  m_serialObj = (wxObject_Serialize *)NULL;
+ wxClassTypeInfo s_typeInfo(wxT_OBJECT_PTR , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject*).name() ) ;
+ wxClassTypeInfo s_typeInfowxObject(wxT_OBJECT , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject).name() ) ;
+#else
+wxClassInfo wxObject::ms_classInfo( wxT("wxObject"), 0, 0,
+                                        (int) sizeof(wxObject),
+                                        (wxObjectConstructorFn) 0 );

 #endif
 #endif

-}

 
 

-wxObject::~wxObject(void)
-{
-       UnRef();
-#if wxUSE_SERIAL
-       if (m_serialObj)
-         delete m_serialObj;
+// restore optimizations
+#if defined __VISUALC__ && __VISUALC__ >= 1300
+    #pragma optimize("", on)

 #endif
 #endif

-}

 
 

-/*
- * Is this object a kind of (a subclass of) 'info'?
- * E.g. is wxWindow a kind of wxObject?
- * Go from this class to superclass, taking into account
- * two possible base classes.
- */
- 
-bool wxObject::IsKindOf(wxClassInfo *info) const
+wxClassInfo* wxClassInfo::sm_first = NULL;
+wxHashTable* wxClassInfo::sm_classTable = NULL;
+
+// when using XTI, this method is already implemented inline inside
+// DECLARE_DYNAMIC_CLASS but otherwise we intentionally make this function
+// non-inline because this allows us to have a non-inline virtual function in
+// all wx classes and this solves linking problems for HP-UX native toolchain
+// and possibly others (we could make dtor non-inline as well but it's more
+// useful to keep it inline than this function)
+#if !wxUSE_EXTENDED_RTTI
+
+wxClassInfo *wxObject::GetClassInfo() const

 {
 {

-  wxClassInfo *thisInfo = GetClassInfo();
-  if (thisInfo)
-    return thisInfo->IsKindOf(info);
-  else
-    return FALSE;
+    return &wxObject::ms_classInfo;

 }
 
 }
 

-#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
-void wxObject::Dump(ostream& str)
+#endif // wxUSE_EXTENDED_RTTI
+
+// this variable exists only so that we can avoid 'always true/false' warnings
+const bool wxFalse = false;
+
+// Is this object a kind of (a subclass of) 'info'?
+// E.g. is wxWindow a kind of wxObject?
+// Go from this class to superclass, taking into account
+// two possible base classes.
+bool wxObject::IsKindOf(const wxClassInfo *info) const

 {
 {

-  if (GetClassInfo() && GetClassInfo()->GetClassName())
-    str << GetClassInfo()->GetClassName();
-  else
-    str << "unknown object class";
+    const wxClassInfo *thisInfo = GetClassInfo();
+    return (thisInfo) ? thisInfo->IsKindOf(info) : false ;

 }
 }

+
+#if wxUSE_MEMORY_TRACING && defined( new )
+    #undef new

 #endif
 
 #endif
 

-#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING

 
 

-#ifdef new
-#undef new
+#ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
+void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )
+{
+    return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true);
+}

 #endif
 
 #endif
 

-void * wxObject::operator new (size_t size, char * fileName, int lineNum)
+#ifdef _WX_WANT_DELETE_VOID
+void wxObject::operator delete ( void *buf )

 {
 {

-  return wxDebugAlloc(size, fileName, lineNum, TRUE);
+    wxDebugFree(buf);

 }
 }

+#endif

 
 

-void wxObject::operator delete (void * buf)
+#ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
+void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )

 {
 {

-  wxDebugFree(buf);
+    wxDebugFree(buf);

 }
 }

+#endif

 
 

-// VC++ 6.0
-#if defined(__VISUALC__) && (__VISUALC__ >= 1200)
-void wxObject::operator delete(void* pData, char* /* fileName */, int /* lineNum */)
+#ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
+void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )

 {
 {

- ::operator delete(pData);
+     wxDebugFree(buf);

 }
 #endif
 
 }
 #endif
 

-// Cause problems for VC++ - crashes
-#if !defined(__VISUALC__) && wxUSE_ARRAY_MEMORY_OPERATORS
-void * wxObject::operator new[] (size_t size, char * fileName, int lineNum)
+#ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
+void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )

 {
 {

-  return wxDebugAlloc(size, fileName, lineNum, TRUE, TRUE);
+    return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true, true);

 }
 }

+#endif

 
 

-void wxObject::operator delete[] (void * buf)
+#ifdef _WX_WANT_ARRAY_DELETE_VOID
+void wxObject::operator delete[] ( void *buf )

 {
 {

-  wxDebugFree(buf, TRUE);
+    wxDebugFree(buf, true);

 }
 #endif
 
 }
 #endif
 

+#ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
+void wxObject::operator delete[] (void * buf, const wxChar*  WXUNUSED(fileName), int WXUNUSED(lineNum) )
+{
+    wxDebugFree(buf, true);
+}

 #endif
 
 #endif
 

-/*
- * Class info: provides run-time class type information.
- */

 
 

-wxClassInfo::wxClassInfo(char *cName, char *baseName1, char *baseName2, int sz, wxObjectConstructorFn constr)
-{
-  m_className = cName;
-  m_baseClassName1 = baseName1;
-  m_baseClassName2 = baseName2;
-
-  m_objectSize = sz;
-  m_objectConstructor = constr;
-  
-  m_next = sm_first;
-  sm_first = this;
-
-  m_baseInfo1 = (wxClassInfo *) NULL;
-  m_baseInfo2 = (wxClassInfo *) NULL;
-}
+// ----------------------------------------------------------------------------
+// wxClassInfo
+// ----------------------------------------------------------------------------

 
 

-wxObject *wxClassInfo::CreateObject(void)
+wxClassInfo::~wxClassInfo()

 {
 {

-  if (m_objectConstructor)
-    return (wxObject *)(*m_objectConstructor)();
-  else
-    return (wxObject *) NULL;
+    // remove this object from the linked list of all class infos: if we don't
+    // do it, loading/unloading a DLL containing static wxClassInfo objects is
+    // not going to work
+    if ( this == sm_first )
+    {
+        sm_first = m_next;
+    }
+    else
+    {
+        wxClassInfo *info = sm_first;
+        while (info)
+        {
+            if ( info->m_next == this )
+            {
+                info->m_next = m_next;
+                break;
+            }
+
+            info = info->m_next;
+        }
+    }
+    Unregister();

 }
 
 }
 

-wxClassInfo *wxClassInfo::FindClass(char *c)
+wxClassInfo *wxClassInfo::FindClass(const wxString& className)

 {
 {

-  wxClassInfo *p = sm_first;
-  while (p)
-  {
-    if (p && p->GetClassName() && strcmp(p->GetClassName(), c) == 0)
-      return p;
-    p = p->m_next;
-  }
-  return (wxClassInfo *) NULL;
+    if ( sm_classTable )
+    {
+        return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
+    }
+    else
+    {
+        for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
+        {
+            if ( className == info->GetClassName() )
+                return info;
+        }
+
+        return NULL;
+    }

 }
 
 }
 

-// Climb upwards through inheritance hierarchy.
-// Dual inheritance is catered for.
-bool wxClassInfo::IsKindOf(wxClassInfo *info) const
+// Reentrance can occur on some platforms (Solaris for one), as the use of hash
+// and string objects can cause other modules to load and register classes
+// before the original call returns. This is handled by keeping the hash table
+// local when it is first created and only assigning it to the global variable
+// when the function is ready to return.
+//
+// That does make the assumption that after the function has completed the
+// first time the problem will no longer happen; all the modules it depends on
+// will have been loaded. The assumption is checked using the 'entry' variable
+// as a reentrance guard, it checks that once the hash table is global it is
+// not accessed multiple times simulateously.
+
+void wxClassInfo::Register()

 {
 {

-  if (info == NULL)
-    return FALSE;
-
-  // For some reason, when making/using a DLL, static data has to be included
-  // in both the DLL and the application. This can lead to duplicate
-  // wxClassInfo objects, so we have to test the name instead of the pointers.
-  // PROBABLY NO LONGER TRUE now I've done DLL creation right.
-/*
-#if WXMAKINGDLL
-  if (GetClassName() && info->GetClassName() && (strcmp(GetClassName(), info->GetClassName()) == 0))
-    return TRUE;
-#else
-*/
-  if (this == info)
-    return TRUE;
+#if wxDEBUG_LEVEL
+    // reentrance guard - see note above
+    static int entry = 0;
+#endif // wxDEBUG_LEVEL
+
+    wxHashTable *classTable;

 
 

-  if (m_baseInfo1)
-    if (m_baseInfo1->IsKindOf(info))
-      return TRUE;
+    if ( !sm_classTable )
+    {
+        // keep the hash local initially, reentrance is possible
+        classTable = new wxHashTable(wxKEY_STRING);
+    }
+    else
+    {
+        // guard againt reentrance once the global has been created
+        wxASSERT_MSG(++entry == 1, wxT("wxClassInfo::Register() reentrance"));
+        classTable = sm_classTable;
+    }

 
 

-  if (m_baseInfo2)
-    return m_baseInfo2->IsKindOf(info);
+    // Using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
+    // link any object module twice mistakenly, or link twice against wx shared
+    // library) will break this function because it will enter an infinite loop
+    // and eventually die with "out of memory" - as this is quite hard to
+    // detect if you're unaware of this, try to do some checks here.
+    wxASSERT_MSG( classTable->Get(m_className) == NULL,
+        wxString::Format
+        (
+            wxT("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"),
+            m_className
+        )
+    );
+
+    classTable->Put(m_className, (wxObject *)this);
+
+    // if we're using a local hash we need to try to make it global
+    if ( sm_classTable != classTable )
+    {
+        if ( !sm_classTable )
+        {
+            // make the hash global
+            sm_classTable = classTable;
+        }
+        else
+        {
+            // the gobal hash has already been created by a reentrant call,
+            // so delete the local hash and try again
+            delete classTable;
+            Register();
+        }
+    }

 
 

-  return FALSE;
+#if wxDEBUG_LEVEL
+    entry = 0;
+#endif // wxDEBUG_LEVEL

 }
 
 }
 

-// Set pointers to base class(es) to speed up IsKindOf
-void wxClassInfo::InitializeClasses(void)
+void wxClassInfo::Unregister()

 {
 {

-  wxClassInfo::sm_classTable = new wxHashTable(wxKEY_STRING);
-
-  // Index all class infos by their class name
-  wxClassInfo *info = sm_first;
-  while (info)
-  {
-    if (info->m_className)
-      sm_classTable->Put(info->m_className, (wxObject *)info);
-    info = info->m_next;
-  }
-
-  // Set base pointers for each wxClassInfo
-  info = sm_first;
-  while (info)
-  {
-    if (info->GetBaseClassName1())
-      info->m_baseInfo1 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName1());
-    if (info->GetBaseClassName2())
-      info->m_baseInfo2 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName2());
-    info = info->m_next;
-  }
+    if ( sm_classTable )
+    {
+        sm_classTable->Delete(m_className);
+        if ( sm_classTable->GetCount() == 0 )
+        {
+            wxDELETE(sm_classTable);
+        }
+    }

 }
 
 }
 

-void wxClassInfo::CleanUpClasses(void)
+wxObject *wxCreateDynamicObject(const wxString& name)

 {
 {

-    delete wxClassInfo::sm_classTable;
-    wxClassInfo::sm_classTable = NULL;
-}
+#if wxUSE_DEBUG_CONTEXT
+    DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
+#endif

 
 

-wxObject *wxCreateDynamicObject(const char *name)
-{
-    if (wxClassInfo::sm_classTable)
+    if ( wxClassInfo::sm_classTable )

     {
         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
     {
         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);

-        if (!info)
-            return (wxObject *)NULL;
-
-        return info->CreateObject();
+        return info ? info->CreateObject() : NULL;

     }
     }

-    else
+    else // no sm_classTable yet

     {
     {

-        wxClassInfo *info = wxClassInfo::sm_first;
-        while (info)
+        for ( wxClassInfo *info = wxClassInfo::sm_first;
+              info;
+              info = info->m_next )

         {
         {

-            if (info->m_className && strcmp(info->m_className, name) == 0)
+            if (info->m_className && wxStrcmp(info->m_className, name) == 0)

                 return info->CreateObject();
                 return info->CreateObject();

-            info = info->m_next;

         }
         }

-        return (wxObject*) NULL;
+
+        return NULL;

     }
     }

-    return (wxObject*) NULL;

 }
 
 }
 

-#if wxUSE_SERIAL
+// iterator interface
+wxClassInfo::const_iterator::value_type
+wxClassInfo::const_iterator::operator*() const
+{
+    return (wxClassInfo*)m_node->GetData();
+}

 
 

-#include "wx/serbase.h"
-#include "wx/dynlib.h"
-#include "wx/msgdlg.h"
+wxClassInfo::const_iterator& wxClassInfo::const_iterator::operator++()
+{
+    m_node = m_table->Next();
+    return *this;
+}

 
 

-wxObject* wxCreateStoredObject( wxInputStream &stream )
+const wxClassInfo::const_iterator wxClassInfo::const_iterator::operator++(int)

 {
 {

-  wxObjectInputStream obj_s(stream);
-  return obj_s.LoadObject();
-};
+    wxClassInfo::const_iterator tmp = *this;
+    m_node = m_table->Next();
+    return tmp;
+}

 
 

-void wxObject::StoreObject( wxObjectOutputStream& stream )
+wxClassInfo::const_iterator wxClassInfo::begin_classinfo()

 {
 {

-  wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
-  wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
-
-  if (!lib) {
-    wxLogError(_("Can't load wxSerial dynamic library."));
-    return;
-  }
-  if (!m_serialObj) {
-    m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
-
-    if (!m_serialObj) {
-      wxLogError(_("Can't find the serialization object '%s' "
-                   "for the object '%s'."),
-                 obj_name.c_str(),
-                 GetClassInfo()->GetClassName());
-      return;
-    }
-    m_serialObj->SetObject(this);
-  }
+    sm_classTable->BeginFind();

 
 

-  m_serialObj->StoreObject(stream);
+    return const_iterator(sm_classTable->Next(), sm_classTable);

 }
 
 }
 

-void wxObject::LoadObject( wxObjectInputStream& stream )
+wxClassInfo::const_iterator wxClassInfo::end_classinfo()

 {
 {

-  wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
-  wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
-
-  if (!m_serialObj) {
-    m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
-
-    if (!m_serialObj) {
-      wxLogError(_("Can't find the serialization object '%s' "
-                   "for the object '%s'."),
-                 obj_name.c_str(),
-                 GetClassInfo()->GetClassName());
-      return;
-    }
-    m_serialObj->SetObject(this);
-  }
+    return const_iterator(NULL, NULL);
+}
+
+// ----------------------------------------------------------------------------
+// wxObjectRefData
+// ----------------------------------------------------------------------------
+
+void wxRefCounter::DecRef()
+{
+    wxASSERT_MSG( m_count > 0, "invalid ref data count" );

 
 

-  m_serialObj->LoadObject(stream);
+    if ( --m_count == 0 )
+        delete this;

 }
 
 }
 

-#endif // wxUSE_SERIAL

 
 

-/*
- * wxObject: cloning of objects
- */
+// ----------------------------------------------------------------------------
+// wxObject
+// ----------------------------------------------------------------------------

 
 void wxObject::Ref(const wxObject& clone)
 {
 
 void wxObject::Ref(const wxObject& clone)
 {

+#if wxUSE_DEBUG_CONTEXT
+    DEBUG_PRINTF(wxObject::Ref)
+#endif
+
+    // nothing to be done
+    if (m_refData == clone.m_refData)
+        return;
+

     // delete reference to old data
     UnRef();
     // delete reference to old data
     UnRef();

+

     // reference new data
     // reference new data

-    if (clone.m_refData) {
+    if ( clone.m_refData )
+    {

         m_refData = clone.m_refData;
         m_refData = clone.m_refData;

-        ++(m_refData->m_count);
+        m_refData->IncRef();

     }
 }
 
     }
 }
 

-void wxObject::UnRef(void)
+void wxObject::UnRef()

 {
 {

-    if (m_refData) {
-        assert(m_refData->m_count > 0);
-        --(m_refData->m_count);
-        if (m_refData->m_count == 0)
-            delete m_refData;
+    if ( m_refData )
+    {
+        m_refData->DecRef();
+        m_refData = NULL;

     }
     }

-    m_refData = (wxObjectRefData *) NULL;

 }
 
 }
 

-/*
- * wxObjectData
- */
-
-wxObjectRefData::wxObjectRefData(void) : m_count(1)
+void wxObject::AllocExclusive()

 {
 {

+    if ( !m_refData )
+    {
+        m_refData = CreateRefData();
+    }
+    else if ( m_refData->GetRefCount() > 1 )
+    {
+        // note that ref is not going to be destroyed in this case
+        const wxObjectRefData* ref = m_refData;
+        UnRef();
+
+        // ... so we can still access it
+        m_refData = CloneRefData(ref);
+    }
+    //else: ref count is 1, we are exclusive owners of m_refData anyhow
+
+    wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
+                  wxT("wxObject::AllocExclusive() failed.") );

 }
 
 }
 

-wxObjectRefData::~wxObjectRefData(void)
+wxObjectRefData *wxObject::CreateRefData() const

 {
 {

+    // if you use AllocExclusive() you must override this method
+    wxFAIL_MSG( wxT("CreateRefData() must be overridden if called!") );
+
+    return NULL;

 }
 
 }
 

-// These are here so we can avoid 'always true/false' warnings
-// by referring to these instead of TRUE/FALSE
-const bool wxTrue = TRUE;
-const bool wxFalse = FALSE;
+wxObjectRefData *
+wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
+{
+    // if you use AllocExclusive() you must override this method
+    wxFAIL_MSG( wxT("CloneRefData() must be overridden if called!") );
+
+    return NULL;
+}