C1001 error when you compile source code that contains the ternary operator (?:) in Visual C++

This article was previously published under Q216715
This article has been archived. It is offered "as is" and will no longer be updated.
When compiling source code containing the ternary operator (?:), if the compiler converts one of the operands from one class type to another, incorrect code may be generated or you might receive the following error message:
fatal error C1001: INTERNAL COMPILER ERROR(compiler file 'E:\8168\vc98\p2\src\P2\ehexcept.c', line 577)
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:
194022 Visual Studio 6.0 service packs, what, where, why
194295 How To Tell That a Visual Studio Service Pack Is Installed

Steps to Reproduce Behavior

#include <afx.h>class F{	char m_str[50];	CString cstr;public:	F(char *str)	{		strcpy(m_str, str);		cstr = "CSTRING";	}	operator CString() 	{		cstr = m_str;		return cstr;	}};void H( const CString & state){	F f("test");	CString str;	str = (state != "off") ? state : f;}				

Article ID: 216715 - Last Review: 02/21/2014 00:33:39 - Revision: 3.1

Microsoft Visual C++ 6.0 Enterprise Edition, Microsoft Visual C++ 6.0 Professional Edition, Microsoft Visual C++, 32-bit Learning Edition 6.0

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