Knowledge Base

BUG: CXX0030 Error Using Enumerated Type in Class

Article ID: 102367

Article Last Modified on 8/16/2005

Microsoft CodeView 4.0
Microsoft CodeView 4.01
Microsoft CodeView 4.01
Microsoft CodeView 4.1
Microsoft CodeView 4.0
Microsoft CodeView 4.01
Microsoft CodeView 4.1
Microsoft Visual Workbench for Windows

This article was previously published under Q102367

SYMPTOMS

An attempt to display a variable in the Locals, QuickWatch, or Watch windows fails and CodeView or Visual Workbench displays the following message:

CXX0030 : Error : expression cannot be evaluated

CAUSE

The application uses a type-defined enumerated bitfield in a class type and the user attempts to display the value of a variable of that type. The CXX0030 error may not occur if you do not attempt to display it.

STATUS

Microsoft has confirmed this to be a problem in CodeView versions 4.0x and 4.1 for MS-DOS and Windows and in Visual Workbench version 1.0 for Windows.

This is not a problem in CodeView version 4.25 for Win32s.

MORE INFORMATION

The following code example demonstrates this problem.

Sample Code

/*
 * Compiler options needed: /Zi /Od /f-
 */ 

#include <iostream.h>
typedef enum
{
   T1
} TENUM;

class TEST
{
public:
   TEST();
   TENUM linkstate:8;
};

TEST::TEST()
{
   linkstate = T1;
}

TEST *port;
void main(void)
{
   port = new TEST;
   // NOTE: Must refer to linkstate for CXX0033 error to occur.
   port->linkstate;
   delete port;
}

Additional query words: 4.00 4.10

Keywords: kb16bitonly KB102367