BUG: CXX0030 Error Using Enumerated Type in Class

MS-DOS              | WINDOWS

The information in this article applies to:

• Microsoft CodeView for MS-DOS, versions 4.0, 4.01, 4.05 and 4.1
• Microsoft CodeView for Windows, versions 4.0, 4.01, and 4.1
• Microsoft Visual Workbench for Windows, version 1.0

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>

   T1

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;