C1001 error when you compile source code that contains the ternary operator (?:) in Visual C++ (216715)

The information in this article applies to:

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

This article was previously published under Q216715

SYMPTOMS

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)

STATUS

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

MORE INFORMATION

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;
}

Modification Type:	Minor	Last Reviewed:	5/3/2005
Keywords:	kberrmsg kbBug kbCompiler kbCPPonly kbfix kbVC600fix kbVS600sp3fix KB216715 kbAudDeveloper