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wxWindows-2.4.0
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src
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common
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object.cpp
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C/C++ Source or Header
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2002-08-14
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/////////////////////////////////////////////////////////////////////////////
// Name: src/common/object.cpp
// Purpose: wxObject implementation
// Author: Julian Smart
// Modified by: Ron Lee
// Created: 04/01/98
// RCS-ID: $Id: object.cpp,v 1.66 2002/08/13 22:37:41 VZ Exp $
// Copyright: (c) 1998 Julian Smart and Markus Holzem
// (c) 2001 Ron Lee <ron@debian.org>
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "object.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/hash.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
// for wxObject::Dump
#include "wx/ioswrap.h"
#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 // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
wxClassInfo wxObject::sm_classwxObject( wxT("wxObject"), 0, 0,
(int) sizeof(wxObject),
(wxObjectConstructorFn) 0 );
wxClassInfo* wxClassInfo::sm_first = NULL;
wxHashTable* wxClassInfo::sm_classTable = 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;
// 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 *thisInfo = GetClassInfo();
return (thisInfo) ? thisInfo->IsKindOf(info) : FALSE ;
}
#if wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
void wxObject::Dump(wxSTD ostream& str)
{
if (GetClassInfo() && GetClassInfo()->GetClassName())
str << GetClassInfo()->GetClassName();
else
str << _T("unknown object class");
}
#endif
#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
#undef new
#endif
#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
#ifdef _WX_WANT_DELETE_VOID
void wxObject::operator delete ( void *buf )
{
wxDebugFree(buf);
}
#endif
#ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
{
wxDebugFree(buf);
}
#endif
#ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )
{
wxDebugFree(buf);
}
#endif
#ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )
{
return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE, TRUE);
}
#endif
#ifdef _WX_WANT_ARRAY_DELETE_VOID
void wxObject::operator delete[] ( void *buf )
{
wxDebugFree(buf, TRUE);
}
#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
// ----------------------------------------------------------------------------
// wxClassInfo
// ----------------------------------------------------------------------------
wxClassInfo::~wxClassInfo()
{
// 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;
}
}
}
wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
{
if ( sm_classTable )
{
return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
}
else
{
for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
{
if ( wxStrcmp(info->GetClassName(), className) == 0 )
return info;
}
return NULL;
}
}
// a tiny InitializeClasses() helper
/* static */
inline wxClassInfo *wxClassInfo::GetBaseByName(const wxChar *name)
{
if ( !name )
return NULL;
wxClassInfo *classInfo = (wxClassInfo *)sm_classTable->Get(name);
// this must be fixed, other things risk work wrongly later if you get this
wxASSERT_MSG( classInfo,
wxString::Format
(
_T("base class '%s' is unknown to wxWindows RTTI"),
name
) );
return classInfo;
}
// Set pointers to base class(es) to speed up IsKindOf
void wxClassInfo::InitializeClasses()
{
// using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
// link any object module twice mistakenly) 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
#ifdef __WXDEBUG__
static const size_t nMaxClasses = 10000; // more than we'll ever have
size_t nClass = 0;
#endif
sm_classTable = new wxHashTable(wxKEY_STRING);
// Index all class infos by their class name
wxClassInfo *info;
for(info = sm_first; info; info = info->m_next)
{
if (info->m_className)
{
wxASSERT_MSG( ++nClass < nMaxClasses,
_T("an infinite loop detected - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
sm_classTable->Put(info->m_className, (wxObject *)info);
}
}
// Set base pointers for each wxClassInfo
for(info = sm_first; info; info = info->m_next)
{
info->m_baseInfo1 = GetBaseByName(info->GetBaseClassName1());
info->m_baseInfo2 = GetBaseByName(info->GetBaseClassName2());
}
}
void wxClassInfo::CleanUpClasses()
{
delete wxClassInfo::sm_classTable;
wxClassInfo::sm_classTable = NULL;
}
wxObject *wxCreateDynamicObject(const wxChar *name)
{
#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
#endif
if ( wxClassInfo::sm_classTable )
{
wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
return info ? info->CreateObject() : NULL;
}
else // no sm_classTable yet
{
for ( wxClassInfo *info = wxClassInfo::sm_first;
info;
info = info->m_next )
{
if (info->m_className && wxStrcmp(info->m_className, name) == 0)
return info->CreateObject();
}
return NULL;
}
}
// ----------------------------------------------------------------------------
// wxObject
// ----------------------------------------------------------------------------
// Initialize ref data from another object (needed for copy constructor and
// assignment operator)
void wxObject::InitFrom(const wxObject& other)
{
m_refData = other.m_refData;
if ( m_refData )
m_refData->m_count++;
}
void wxObject::Ref(const wxObject& clone)
{
#if defined(__WXDEBUG__) || 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();
// reference new data
if ( clone.m_refData )
{
m_refData = clone.m_refData;
++(m_refData->m_count);
}
}
void wxObject::UnRef()
{
if ( m_refData )
{
wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
if ( !--m_refData->m_count )
delete m_refData;
m_refData = NULL;
}
}
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,
_T("wxObject::AllocExclusive() failed.") );
}
wxObjectRefData *wxObject::CreateRefData() const
{
// if you use AllocExclusive() you must override this method
wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
return NULL;
}
wxObjectRefData *
wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
{
// if you use AllocExclusive() you must override this method
wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
return NULL;
}
// ----------------------------------------------------------------------------
// misc
// ----------------------------------------------------------------------------
#if defined(__DARWIN__) && defined(WXMAKINGDLL)
extern "C" {
void __initialize_Cplusplus(void);
void wxWindowsDylibInit(void);
};
// Dynamic shared library (dylib) initialization routine
// required to initialize static C++ objects bacause of lazy dynamic linking
// http://developer.apple.com/techpubs/macosx/Essentials/
// SystemOverview/Frameworks/Dynamic_Shared_Libraries.html
void wxWindowsDylibInit()
{
// The function __initialize_Cplusplus() must be called from the shared
// library initialization routine to cause the static C++ objects in
// the library to be initialized (reference number 2441683).
// This only seems to be necessary if the library initialization routine
// needs to use the static C++ objects
__initialize_Cplusplus();
}
#endif
// vi:sts=4:sw=4:et