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wxWidgets/include/wx/object.h
Robert Roebling e39d30c05b Correct wxObjectDataPtr<> assignment from *T to not increase the ref count 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51076 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2008-01-07 15:12:46 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: wx/object.h
// Purpose: wxObject class, plus run-time type information macros
// Author: Julian Smart
// Modified by: Ron Lee
// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c) 1997 Julian Smart
// (c) 2001 Ron Lee <ron@debian.org>
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_OBJECTH__
#define _WX_OBJECTH__
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#include "wx/memory.h"
class WXDLLIMPEXP_FWD_BASE wxObject;
class WXDLLIMPEXP_FWD_BASE wxString;
#ifndef wxUSE_EXTENDED_RTTI
#define wxUSE_EXTENDED_RTTI 0
#endif
#define DECLARE_CLASS_INFO_ITERATORS() \
class WXDLLIMPEXP_BASE const_iterator \
{ \
typedef wxHashTable_Node Node; \
public: \
typedef const wxClassInfo* value_type; \
typedef const value_type& const_reference; \
typedef const_iterator itor; \
typedef value_type* ptr_type; \
\
Node* m_node; \
wxHashTable* m_table; \
public: \
typedef const_reference reference_type; \
typedef ptr_type pointer_type; \
\
const_iterator(Node* node, wxHashTable* table) \
: m_node(node), m_table(table) { } \
const_iterator() : m_node(NULL), m_table(NULL) { } \
value_type operator*() const; \
itor& operator++(); \
const itor operator++(int); \
bool operator!=(const itor& it) const \
{ return it.m_node != m_node; } \
bool operator==(const itor& it) const \
{ return it.m_node == m_node; } \
}; \
\
static const_iterator begin_classinfo(); \
static const_iterator end_classinfo();
#if wxUSE_EXTENDED_RTTI
#include "wx/xti.h"
#else
// ----------------------------------------------------------------------------
// conditional compilation
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_FWD_BASE wxClassInfo;
class WXDLLIMPEXP_FWD_BASE wxHashTable;
class WXDLLIMPEXP_FWD_BASE wxObject;
class WXDLLIMPEXP_FWD_BASE wxPluginLibrary;
class WXDLLIMPEXP_FWD_BASE wxObjectRefData;
class WXDLLIMPEXP_FWD_BASE wxHashTable_Node;
// ----------------------------------------------------------------------------
// wxClassInfo
// ----------------------------------------------------------------------------
typedef wxObject *(*wxObjectConstructorFn)(void);
class WXDLLIMPEXP_BASE wxClassInfo
{
friend class WXDLLIMPEXP_FWD_BASE wxObject;
friend WXDLLIMPEXP_BASE wxObject *wxCreateDynamicObject(const wxString& name);
public:
wxClassInfo( const wxChar *className,
const wxClassInfo *baseInfo1,
const wxClassInfo *baseInfo2,
int size,
wxObjectConstructorFn ctor )
: m_className(className)
, m_objectSize(size)
, m_objectConstructor(ctor)
, m_baseInfo1(baseInfo1)
, m_baseInfo2(baseInfo2)
, m_next(sm_first)
{
sm_first = this;
Register();
}
~wxClassInfo();
wxObject *CreateObject() const
{ return m_objectConstructor ? (*m_objectConstructor)() : 0; }
bool IsDynamic() const { return (NULL != m_objectConstructor); }
const wxChar *GetClassName() const { return m_className; }
const wxChar *GetBaseClassName1() const
{ return m_baseInfo1 ? m_baseInfo1->GetClassName() : NULL; }
const wxChar *GetBaseClassName2() const
{ return m_baseInfo2 ? m_baseInfo2->GetClassName() : NULL; }
const wxClassInfo *GetBaseClass1() const { return m_baseInfo1; }
const wxClassInfo *GetBaseClass2() const { return m_baseInfo2; }
int GetSize() const { return m_objectSize; }
wxObjectConstructorFn GetConstructor() const
{ return m_objectConstructor; }
static const wxClassInfo *GetFirst() { return sm_first; }
const wxClassInfo *GetNext() const { return m_next; }
static wxClassInfo *FindClass(const wxString& className);
// Climb upwards through inheritance hierarchy.
// Dual inheritance is catered for.
bool IsKindOf(const wxClassInfo *info) const
{
return info != 0 &&
( info == this ||
( m_baseInfo1 && m_baseInfo1->IsKindOf(info) ) ||
( m_baseInfo2 && m_baseInfo2->IsKindOf(info) ) );
}
DECLARE_CLASS_INFO_ITERATORS()
private:
const wxChar *m_className;
int m_objectSize;
wxObjectConstructorFn m_objectConstructor;
// Pointers to base wxClassInfos
const wxClassInfo *m_baseInfo1;
const wxClassInfo *m_baseInfo2;
// class info object live in a linked list:
// pointers to its head and the next element in it
static wxClassInfo *sm_first;
wxClassInfo *m_next;
static wxHashTable *sm_classTable;
protected:
// registers the class
void Register();
void Unregister();
DECLARE_NO_COPY_CLASS(wxClassInfo)
};
WXDLLIMPEXP_BASE wxObject *wxCreateDynamicObject(const wxString& name);
// ----------------------------------------------------------------------------
// Dynamic class macros
// ----------------------------------------------------------------------------
#define DECLARE_ABSTRACT_CLASS(name) \
public: \
static wxClassInfo ms_classInfo; \
virtual wxClassInfo *GetClassInfo() const;
#define DECLARE_DYNAMIC_CLASS_NO_ASSIGN(name) \
DECLARE_NO_ASSIGN_CLASS(name) \
DECLARE_DYNAMIC_CLASS(name)
#define DECLARE_DYNAMIC_CLASS_NO_COPY(name) \
DECLARE_NO_COPY_CLASS(name) \
DECLARE_DYNAMIC_CLASS(name)
#define DECLARE_DYNAMIC_CLASS(name) \
DECLARE_ABSTRACT_CLASS(name) \
static wxObject* wxCreateObject();
#define DECLARE_CLASS(name) DECLARE_DYNAMIC_CLASS(name)
// common part of the macros below
#define wxIMPLEMENT_CLASS_COMMON(name, basename, baseclsinfo2, func) \
wxClassInfo name::ms_classInfo(wxT(#name), \
&basename::ms_classInfo, \
baseclsinfo2, \
(int) sizeof(name), \
(wxObjectConstructorFn) func); \
\
wxClassInfo *name::GetClassInfo() const \
{ return &name::ms_classInfo; }
#define wxIMPLEMENT_CLASS_COMMON1(name, basename, func) \
wxIMPLEMENT_CLASS_COMMON(name, basename, NULL, func)
#define wxIMPLEMENT_CLASS_COMMON2(name, basename1, basename2, func) \
wxIMPLEMENT_CLASS_COMMON(name, basename1, &basename2::ms_classInfo, func)
// -----------------------------------
// for concrete classes
// -----------------------------------
// Single inheritance with one base class
#define IMPLEMENT_DYNAMIC_CLASS(name, basename) \
wxIMPLEMENT_CLASS_COMMON1(name, basename, name::wxCreateObject) \
wxObject* name::wxCreateObject() \
{ return new name; }
// Multiple inheritance with two base classes
#define IMPLEMENT_DYNAMIC_CLASS2(name, basename1, basename2) \
wxIMPLEMENT_CLASS_COMMON2(name, basename1, basename2, \
name::wxCreateObject) \
wxObject* name::wxCreateObject() \
{ return new name; }
// -----------------------------------
// for abstract classes
// -----------------------------------
// Single inheritance with one base class
#define IMPLEMENT_ABSTRACT_CLASS(name, basename) \
wxIMPLEMENT_CLASS_COMMON1(name, basename, NULL)
// Multiple inheritance with two base classes
#define IMPLEMENT_ABSTRACT_CLASS2(name, basename1, basename2) \
wxIMPLEMENT_CLASS_COMMON2(name, basename1, basename2, NULL)
#define IMPLEMENT_CLASS IMPLEMENT_ABSTRACT_CLASS
#define IMPLEMENT_CLASS2 IMPLEMENT_ABSTRACT_CLASS2
#endif // !wxUSE_EXTENDED_RTTI
// -----------------------------------
// for pluggable classes
// -----------------------------------
// NOTE: this should probably be the very first statement
// in the class declaration so wxPluginSentinel is
// the first member initialised and the last destroyed.
// _DECLARE_DL_SENTINEL(name) wxPluginSentinel m_pluginsentinel;
#if wxUSE_NESTED_CLASSES
#define _DECLARE_DL_SENTINEL(name, exportdecl) \
class exportdecl name##PluginSentinel { \
private: \
static const wxString sm_className; \
public: \
name##PluginSentinel(); \
~name##PluginSentinel(); \
}; \
name##PluginSentinel m_pluginsentinel;
#define _IMPLEMENT_DL_SENTINEL(name) \
const wxString name::name##PluginSentinel::sm_className(#name); \
name::name##PluginSentinel::name##PluginSentinel() { \
wxPluginLibrary *e = (wxPluginLibrary*) wxPluginLibrary::ms_classes.Get(#name); \
if( e != 0 ) { e->RefObj(); } \
} \
name::name##PluginSentinel::~name##PluginSentinel() { \
wxPluginLibrary *e = (wxPluginLibrary*) wxPluginLibrary::ms_classes.Get(#name); \
if( e != 0 ) { e->UnrefObj(); } \
}
#else
#define _DECLARE_DL_SENTINEL(name)
#define _IMPLEMENT_DL_SENTINEL(name)
#endif // wxUSE_NESTED_CLASSES
#define DECLARE_PLUGGABLE_CLASS(name) \
DECLARE_DYNAMIC_CLASS(name) _DECLARE_DL_SENTINEL(name, WXDLLEXPORT)
#define DECLARE_ABSTRACT_PLUGGABLE_CLASS(name) \
DECLARE_ABSTRACT_CLASS(name) _DECLARE_DL_SENTINEL(name, WXDLLEXPORT)
#define DECLARE_USER_EXPORTED_PLUGGABLE_CLASS(name, usergoo) \
DECLARE_DYNAMIC_CLASS(name) _DECLARE_DL_SENTINEL(name, usergoo)
#define DECLARE_USER_EXPORTED_ABSTRACT_PLUGGABLE_CLASS(name, usergoo) \
DECLARE_ABSTRACT_CLASS(name) _DECLARE_DL_SENTINEL(name, usergoo)
#define IMPLEMENT_PLUGGABLE_CLASS(name, basename) \
IMPLEMENT_DYNAMIC_CLASS(name, basename) _IMPLEMENT_DL_SENTINEL(name)
#define IMPLEMENT_PLUGGABLE_CLASS2(name, basename1, basename2) \
IMPLEMENT_DYNAMIC_CLASS2(name, basename1, basename2) _IMPLEMENT_DL_SENTINEL(name)
#define IMPLEMENT_ABSTRACT_PLUGGABLE_CLASS(name, basename) \
IMPLEMENT_ABSTRACT_CLASS(name, basename) _IMPLEMENT_DL_SENTINEL(name)
#define IMPLEMENT_ABSTRACT_PLUGGABLE_CLASS2(name, basename1, basename2) \
IMPLEMENT_ABSTRACT_CLASS2(name, basename1, basename2) _IMPLEMENT_DL_SENTINEL(name)
#define IMPLEMENT_USER_EXPORTED_PLUGGABLE_CLASS(name, basename) \
IMPLEMENT_PLUGGABLE_CLASS(name, basename)
#define IMPLEMENT_USER_EXPORTED_PLUGGABLE_CLASS2(name, basename1, basename2) \
IMPLEMENT_PLUGGABLE_CLASS2(name, basename1, basename2)
#define IMPLEMENT_USER_EXPORTED_ABSTRACT_PLUGGABLE_CLASS(name, basename) \
IMPLEMENT_ABSTRACT_PLUGGABLE_CLASS(name, basename)
#define IMPLEMENT_USER_EXPORTED_ABSTRACT_PLUGGABLE_CLASS2(name, basename1, basename2) \
IMPLEMENT_ABSTRACT_PLUGGABLE_CLASS2(name, basename1, basename2)
#define CLASSINFO(name) (&name::ms_classInfo)
#define wxIS_KIND_OF(obj, className) obj->IsKindOf(&className::ms_classInfo)
// Just seems a bit nicer-looking (pretend it's not a macro)
#define wxIsKindOf(obj, className) obj->IsKindOf(&className::ms_classInfo)
// this cast does some more checks at compile time as it uses static_cast
// internally
//
// note that it still has different semantics from dynamic_cast<> and so can't
// be replaced by it as long as there are any compilers not supporting it
#define wxDynamicCast(obj, className) \
((className *) wxCheckDynamicCast( \
wx_const_cast(wxObject *, wx_static_cast(const wxObject *, \
wx_const_cast(className *, wx_static_cast(const className *, obj)))), \
&className::ms_classInfo))
// The 'this' pointer is always true, so use this version
// to cast the this pointer and avoid compiler warnings.
#define wxDynamicCastThis(className) \
(IsKindOf(&className::ms_classInfo) ? (className *)(this) : (className *)0)
#ifdef __WXDEBUG__
inline void* wxCheckCast(void *ptr)
{
wxASSERT_MSG( ptr, _T("wxStaticCast() used incorrectly") );
return ptr;
}
#define wxStaticCast(obj, className) \
((className *)wxCheckCast(wxDynamicCast(obj, className)))
#else // !__WXDEBUG__
#define wxStaticCast(obj, className) \
wx_const_cast(className *, wx_static_cast(const className *, obj))
#endif // __WXDEBUG__
// ----------------------------------------------------------------------------
// set up memory debugging macros
// ----------------------------------------------------------------------------
/*
Which new/delete operator variants do we want?
_WX_WANT_NEW_SIZET_WXCHAR_INT = void *operator new (size_t size, wxChar *fileName = 0, int lineNum = 0)
_WX_WANT_DELETE_VOID = void operator delete (void * buf)
_WX_WANT_DELETE_VOID_CONSTCHAR_SIZET = void operator delete (void *buf, const char *_fname, size_t _line)
_WX_WANT_DELETE_VOID_WXCHAR_INT = void operator delete(void *buf, wxChar*, int)
_WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT = void *operator new[] (size_t size, wxChar *fileName , int lineNum = 0)
_WX_WANT_ARRAY_DELETE_VOID = void operator delete[] (void *buf)
_WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT = void operator delete[] (void* buf, wxChar*, int )
*/
#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING
// All compilers get this one
#define _WX_WANT_NEW_SIZET_WXCHAR_INT
// Everyone except Visage gets the next one
#ifndef __VISAGECPP__
#define _WX_WANT_DELETE_VOID
#endif
// Only visage gets this one under the correct circumstances
#if defined(__VISAGECPP__) && __DEBUG_ALLOC__
#define _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
#endif
// Only VC++ 6 and CodeWarrior get overloaded delete that matches new
#if (defined(__VISUALC__) && (__VISUALC__ >= 1200)) || \
(defined(__MWERKS__) && (__MWERKS__ >= 0x2400))
#define _WX_WANT_DELETE_VOID_WXCHAR_INT
#endif
// Now see who (if anyone) gets the array memory operators
#if wxUSE_ARRAY_MEMORY_OPERATORS
// Everyone except Visual C++ (cause problems for VC++ - crashes)
#if !defined(__VISUALC__)
#define _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
#endif
// Everyone except Visual C++ (cause problems for VC++ - crashes)
#if !defined(__VISUALC__)
#define _WX_WANT_ARRAY_DELETE_VOID
#endif
// Only CodeWarrior 6 or higher
#if defined(__MWERKS__) && (__MWERKS__ >= 0x2400)
#define _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
#endif
#endif // wxUSE_ARRAY_MEMORY_OPERATORS
#endif // __WXDEBUG__ && wxUSE_MEMORY_TRACING
// ----------------------------------------------------------------------------
// wxObjectRefData: ref counted data meant to be stored in wxObject
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxObjectRefData
{
friend class WXDLLIMPEXP_FWD_BASE wxObject;
public:
wxObjectRefData() : m_count(1) { }
int GetRefCount() const { return m_count; }
void IncRef() { m_count++; }
void DecRef();
protected:
// this object should never be destroyed directly but only as a
// result of a DecRef() call:
virtual ~wxObjectRefData() { }
private:
// our refcount:
int m_count;
};
// ----------------------------------------------------------------------------
// wxObjectDataPtr: helper class to avoid memleaks because of missing calls
// to wxObjectRefData::DecRef
// ----------------------------------------------------------------------------
template <class T>
class wxObjectDataPtr
{
public:
typedef T element_type;
wxEXPLICIT wxObjectDataPtr(T *ptr = NULL) : m_ptr(ptr) {}
// copy ctor
wxObjectDataPtr(const wxObjectDataPtr<T> &tocopy)
: m_ptr(tocopy.m_ptr)
{
if (m_ptr)
m_ptr->IncRef();
}
~wxObjectDataPtr()
{
if (m_ptr)
m_ptr->DecRef();
}
T *get() const { return m_ptr; }
T *operator->() const
{
wxASSERT(m_ptr != NULL);
return get();
}
void reset(T *ptr)
{
if (m_ptr)
m_ptr->DecRef();
m_ptr = ptr;
}
wxObjectDataPtr& operator=(const wxObjectDataPtr &tocopy)
{
if (m_ptr)
m_ptr->DecRef();
m_ptr = tocopy.m_ptr;
if (m_ptr)
m_ptr->IncRef();
return *this;
}
wxObjectDataPtr& operator=(T *ptr)
{
if (m_ptr)
m_ptr->DecRef();
m_ptr = ptr;
return *this;
}
private:
T *m_ptr;
};
// ----------------------------------------------------------------------------
// wxObject: the root class of wxWidgets object hierarchy
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxObject
{
DECLARE_ABSTRACT_CLASS(wxObject)
public:
wxObject() { m_refData = NULL; }
virtual ~wxObject() { UnRef(); }
wxObject(const wxObject& other)
{
m_refData = other.m_refData;
if (m_refData)
m_refData->m_count++;
}
wxObject& operator=(const wxObject& other)
{
if ( this != &other )
{
Ref(other);
}
return *this;
}
bool IsKindOf(wxClassInfo *info) const;
// Turn on the correct set of new and delete operators
#ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
void *operator new ( size_t size, const wxChar *fileName = NULL, int lineNum = 0 );
#endif
#ifdef _WX_WANT_DELETE_VOID
void operator delete ( void * buf );
#endif
#ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
void operator delete ( void *buf, const char *_fname, size_t _line );
#endif
#ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
void operator delete ( void *buf, const wxChar*, int );
#endif
#ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
void *operator new[] ( size_t size, const wxChar *fileName = NULL, int lineNum = 0 );
#endif
#ifdef _WX_WANT_ARRAY_DELETE_VOID
void operator delete[] ( void *buf );
#endif
#ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
void operator delete[] (void* buf, const wxChar*, int );
#endif
// ref counted data handling methods
// get/set
wxObjectRefData *GetRefData() const { return m_refData; }
void SetRefData(wxObjectRefData *data) { m_refData = data; }
// make a 'clone' of the object
void Ref(const wxObject& clone);
// destroy a reference
void UnRef();
// Make sure this object has only one reference
void UnShare() { AllocExclusive(); }
// check if this object references the same data as the other one
bool IsSameAs(const wxObject& o) const { return m_refData == o.m_refData; }
protected:
// ensure that our data is not shared with anybody else: if we have no
// data, it is created using CreateRefData() below, if we have shared data
// it is copied using CloneRefData(), otherwise nothing is done
void AllocExclusive();
// both methods must be implemented if AllocExclusive() is used, not pure
// virtual only because of the backwards compatibility reasons
// create a new m_refData
virtual wxObjectRefData *CreateRefData() const;
// create a new m_refData initialized with the given one
virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
wxObjectRefData *m_refData;
};
inline wxObject *wxCheckDynamicCast(wxObject *obj, wxClassInfo *classInfo)
{
return obj && obj->GetClassInfo()->IsKindOf(classInfo) ? obj : NULL;
}
#if wxUSE_EXTENDED_RTTI
class WXDLLIMPEXP_BASE wxDynamicObject : public wxObject
{
friend class WXDLLIMPEXP_FWD_BASE wxDynamicClassInfo ;
public:
// instantiates this object with an instance of its superclass
wxDynamicObject(wxObject* superClassInstance, const wxDynamicClassInfo *info) ;
virtual ~wxDynamicObject();
void SetProperty (const wxChar *propertyName, const wxxVariant &value);
wxxVariant GetProperty (const wxChar *propertyName) const ;
// get the runtime identity of this object
wxClassInfo *GetClassInfo() const
{
#ifdef _MSC_VER
return (wxClassInfo*) m_classInfo;
#else
wxDynamicClassInfo *nonconst = wx_const_cast(wxDynamicClassInfo *, m_classInfo);
return wx_static_cast(wxClassInfo *, nonconst);
#endif
}
wxObject* GetSuperClassInstance() const
{
return m_superClassInstance ;
}
private :
// removes an existing runtime-property
void RemoveProperty( const wxChar *propertyName ) ;
// renames an existing runtime-property
void RenameProperty( const wxChar *oldPropertyName , const wxChar *newPropertyName ) ;
wxObject *m_superClassInstance ;
const wxDynamicClassInfo *m_classInfo;
struct wxDynamicObjectInternal;
wxDynamicObjectInternal *m_data;
};
#endif
// ----------------------------------------------------------------------------
// more debugging macros
// ----------------------------------------------------------------------------
// Redefine new to be the debugging version. This doesn't work with all
// compilers, in which case you need to use WXDEBUG_NEW explicitly if you wish
// to use the debugging version.
#ifdef __WXDEBUG__
#define WXDEBUG_NEW new(__TFILE__,__LINE__)
#if wxUSE_DEBUG_NEW_ALWAYS
#if wxUSE_GLOBAL_MEMORY_OPERATORS
#define new WXDEBUG_NEW
#elif defined(__VISUALC__)
// Including this file redefines new and allows leak reports to
// contain line numbers
#include "wx/msw/msvcrt.h"
#endif
#endif // wxUSE_DEBUG_NEW_ALWAYS
#else // !__WXDEBUG__
#define WXDEBUG_NEW new
#endif // __WXDEBUG__/!__WXDEBUG__
#endif // _WX_OBJECTH__
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