fix wxDataObjectComposite::GetFormatCount and add some comments to explain the reason...

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

diff --git a/src/common/object.cpp b/src/common/object.cpp
index 87e3dc1ed78bc0977852256aa609a791338cc180..c6e4f241a84a3015975e1e28b8bdc64a04fdb629 100644 (file)
--- a/src/common/object.cpp
+++ b/src/common/object.cpp
@@ -14,20 +14,18 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-    #include "wx/hash.h"
     #include "wx/object.h"
+    #include "wx/hash.h"
+    #include "wx/memory.h"
+    #include "wx/crt.h"
 #endif
 
 #include <string.h>
 
-#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
-#include "wx/memory.h"
-#endif
-
 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
     #if defined(__VISAGECPP__)
         #define DEBUG_PRINTF(NAME) { static int raz=0; \
@@ -55,7 +53,7 @@ const wxClassInfo* wxObject::ms_classParents[] = { NULL } ;
  wxClassInfo wxObject::ms_classInfo(ms_classParents , wxEmptyString , wxT("wxObject"),
             (int) sizeof(wxObject),                              \
             (wxObjectConstructorFn) 0   ,
-            (wxPropertyInfo*) NULL,(wxHandlerInfo*) NULL,0 , 0 ,
+            NULL,NULL,0 , 0 ,
             0 , wxVariantOfPtrToObjectConverterwxObject , wxVariantToObjectConverterwxObject , wxObjectToVariantConverterwxObject);
  template<> void wxStringReadValue(const wxString & , wxObject * & ){assert(0) ;}
  template<> void wxStringWriteValue(wxString & , wxObject* const & ){assert(0) ;}
@@ -99,9 +97,9 @@ const bool wxFalse = false;
 // 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
+bool wxObject::IsKindOf(const wxClassInfo *info) const
 {
-    wxClassInfo *thisInfo = GetClassInfo();
+    const wxClassInfo *thisInfo = GetClassInfo();
     return (thisInfo) ? thisInfo->IsKindOf(info) : false ;
 }
 
@@ -190,7 +188,7 @@ wxClassInfo::~wxClassInfo()
     Unregister();
 }
 
-wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
+wxClassInfo *wxClassInfo::FindClass(const wxString& className)
 {
     if ( sm_classTable )
     {
@@ -200,7 +198,7 @@ wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
     {
         for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
         {
-            if ( wxStrcmp(info->GetClassName(), className) == 0 )
+            if ( className == info->GetClassName() )
                 return info;
         }
 
@@ -208,22 +206,31 @@ wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
     }
 }
 
-void wxClassInfo::CleanUp()
-{
-    if ( sm_classTable )
-    {
-        delete sm_classTable;
-        sm_classTable = NULL;
-    }
-}
+// This function wasn't written to be reentrant but there is a possiblity of
+// reentrance if something it does causes a shared lib to load and register
+// classes. On Solaris this happens when the wxHashTable is newed, so the first
+// part of the function has been modified to handle it, and a wxASSERT checks
+// against reentrance in the remainder of the function.
 
 void wxClassInfo::Register()
 {
     if ( !sm_classTable )
     {
-        sm_classTable = new wxHashTable(wxKEY_STRING);
+        wxHashTable *classTable = new wxHashTable(wxKEY_STRING);
+
+        // check for reentrance
+        if ( sm_classTable )
+            delete classTable;
+        else
+            sm_classTable = classTable;
     }
 
+#ifdef __WXDEBUG__
+    // reentrance guard - see note above
+    static int entry = 0;
+    wxASSERT_MSG(++entry == 1, _T("wxClassInfo::Register() reentrance"));
+#endif
+
     // 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
@@ -238,6 +245,10 @@ void wxClassInfo::Register()
     );
 
     sm_classTable->Put(m_className, (wxObject *)this);
+
+#ifdef __WXDEBUG__
+    --entry;
+#endif
 }
 
 void wxClassInfo::Unregister()
@@ -253,7 +264,7 @@ void wxClassInfo::Unregister()
     }
 }
 
-wxObject *wxCreateDynamicObject(const wxChar *name)
+wxObject *wxCreateDynamicObject(const wxString& name)
 {
 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
     DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
@@ -278,6 +289,48 @@ wxObject *wxCreateDynamicObject(const wxChar *name)
     }
 }
 
+// iterator interface
+wxClassInfo::const_iterator::value_type
+wxClassInfo::const_iterator::operator*() const
+{
+    return (wxClassInfo*)m_node->GetData();
+}
+
+wxClassInfo::const_iterator& wxClassInfo::const_iterator::operator++()
+{
+    m_node = m_table->Next();
+    return *this;
+}
+
+const wxClassInfo::const_iterator wxClassInfo::const_iterator::operator++(int)
+{
+    wxClassInfo::const_iterator tmp = *this;
+    m_node = m_table->Next();
+    return tmp;
+}
+
+wxClassInfo::const_iterator wxClassInfo::begin_classinfo()
+{
+    sm_classTable->BeginFind();
+
+    return const_iterator(sm_classTable->Next(), sm_classTable);
+}
+
+wxClassInfo::const_iterator wxClassInfo::end_classinfo()
+{
+    return const_iterator(NULL, NULL);
+}
+
+// ----------------------------------------------------------------------------
+// wxObjectRefData
+// ----------------------------------------------------------------------------
+
+void wxObjectRefData::DecRef()
+{
+    if ( --m_count == 0 )
+        delete this;
+}
+
 
 // ----------------------------------------------------------------------------
 // wxObject
@@ -300,7 +353,7 @@ void wxObject::Ref(const wxObject& clone)
     if ( clone.m_refData )
     {
         m_refData = clone.m_refData;
-        ++(m_refData->m_count);
+        m_refData->IncRef();
     }
 }
 
@@ -310,8 +363,7 @@ void wxObject::UnRef()
     {
         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 
-        if ( --m_refData->m_count == 0 )
-            delete m_refData;
+        m_refData->DecRef();
         m_refData = NULL;
     }
 }