BUG: Aggregate Initializer Fails In VC++ 32-bit, Ver. 1.0, 2.0

• Microsoft C/C++ Compiler (CL.EXE), included with:
  • Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0

SYMPTOMS

If "operator =" is overridden in an aggregate class, you can no longer use an initializer list to construct a constant object.

CAUSE

The assignment operator causes the const object to be place in read only memory before it is initialized. Upon initialization of the object, the application fails with an access violation.

RESOLUTION

To work around this problem, create a constructor to initialize the object.

STATUS

Microsoft has confirmed this to be a bug in the products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following sample generates an Application Error message box when initializing kZeroMLUInt64:

Sample Code

class MLUInt64 {
public:
 // If this following inline method is commented out the correct code
 // will be generated.
    const MLUInt64 & operator= (const MLUInt64 &u64)
                      {fVal[0] = u64.fVal[0];
                       fVal[1] = u64.fVal[1];
                       return *this;}

    int    fVal[2];
}; // class MLUInt64

const MLUInt64 kZeroMLUInt64 = {1,1};

void main(void) {

   MLUInt64 kTempMLUInt64;

   kTempMLUInt64 = kZeroMLUInt64;
} 

Additional query words: 8.00 9.00 1.00 2.00

Keywords : kbCompiler kbCPPonly kbVC
Version : :1.0,2.0
Platform : NT WINDOWS
Issue type :