Article ID: 128600 - Last Review: July 5, 2005 - Revision: 1.1

BUG: Redefinition of Enum Data Type Does Not Cause an Error

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This article was previously published under Q128600

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SYMPTOMS

When an enumerated type is declared in class scope, if it is declared again at global scope, the compiler will not generate an error. However, once redefined, the result of using those enumerated types is unpredictable.
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RESOLUTION

An enumerated type should be defined only once within any scope.
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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
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MORE INFORMATION

Sample Code to Demonstrate Problem

/* Compiler options needed: /c
*/ 

class Test
{
  public:
    enum status {a = 2, b};
};

enum Test::status {a = 4, b, c};     // Should be an error
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REFERENCES

"The Annotated C++ Reference Manual" by Ellis and Stroustrup (Jan 1994), section 7.2
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APPLIES TO
  • Microsoft Visual C++ 2.0 Professional Edition
  • Microsoft Visual C++ 2.1
  • Microsoft Visual C++ 4.0 Standard Edition
  • Microsoft Visual C++ 4.1 Subscription
  • Microsoft Visual C++ 4.2 Enterprise Edition
  • Microsoft Visual C++ 4.2 Professional Edition
  • Microsoft Visual C++ 5.0 Enterprise Edition
  • Microsoft Visual C++ 5.0 Professional Edition
  • Microsoft Visual C++ 6.0 Enterprise Edition
  • Microsoft Visual C++ 6.0 Professional Edition
  • Microsoft Visual C++, 32-bit Learning Edition 6.0
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Keywords: 
kbbug kbcpponly kbcompiler KB128600
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