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debug check for infinite loop in InitializeClasses() added

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4815 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 1999-12-04 12:14:38 +00:00
parent f6b7723929
commit 309689b214
1 changed files with 19 additions and 0 deletions
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19
src/common/object.cpp
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@ -225,6 +225,17 @@ return TRUE;
// 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__
// more classes than we'll ever have
static const size_t nMaxClasses = 10000;
size_t nClass = 0;
#endif // Debug
wxClassInfo::sm_classTable = new wxHashTable(wxKEY_STRING);
// Index all class infos by their class name
@ -232,7 +243,15 @@ void wxClassInfo::InitializeClasses()
while (info)
{
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);
}
info = info->m_next;
}