FIX: Bad Code Generated in ?: Operator Converting Class Types

• Microsoft Visual C++, 32-bit Editions, version 6.0

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 this to be a bug in the Microsoft products 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:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are 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;
} 

Additional query words:

Keywords : kbservicepack kbCompiler kbCPPonly kbVC600bug kbVC600fix kbVS600sp2 kbVS600SP1 kbVS600sp3fix
Version : winnt:6.0
Platform : winnt
Issue type : kbbug